Becker, Heiko C.

[["dc.bibliographiccitation.firstpage","157"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Euphytica"],["dc.bibliographiccitation.lastpage","163"],["dc.bibliographiccitation.volume","146"],["dc.contributor.author","Abel, Stefan"],["dc.contributor.author","Mollers, C."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T10:54:34Z"],["dc.date.available","2018-11-07T10:54:34Z"],["dc.date.issued","2005"],["dc.description.abstract","Allopolyploids are widely spread in the plant kingdom. Their success might be explained by positive interactions between homoeologous genes on their different genomes, similar to the positive interactions between different alleles of one gene causing heterosis in heterozygous diploid genotypes. In allopolyploids, such interactions can also occur in homozygous genotypes, and may therefore be called \"fixed heterosis\". As to our knowledge, no experimental data are available to support this hypothesis. We propose an experimental approach to quantify \"fixed heterosis\" in resynthesised Brassica napus and the detection of loci contributing to \"fixed heterosis\" via comparative QTL mapping in B. napus and its parental species B. rapa and B. oleracea. In order to develop a genetically balanced material, interspecific crosses between 21 Brassica rapa and 16 Brassica oleracea doubled haploid or inbred lines were performed. In total 3485 vital embryos have been obtained from 9514 pollinated buds. The success of interspecific hybridisation was highly depending on the maternal genotype (B. rapa) and ranged from 0 to 1.18 embryos per pollinated bud. For the genetic characterisation of the B. rapa and B. oleracea lines, a dendrogram was constructed based on 273 RAPD markers. Thus a well-characterised material is now available, which is suitable to analyse the effects of \"fixed heterosis\" and the interactions between homoeologous genes in allopolyploid species."],["dc.identifier.doi","10.1007/s10681-005-3364-7"],["dc.identifier.isi","000233634000019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49593"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0014-2336"],["dc.title","Development of synthetic Brassica napus lines for the analysis of \"fixed heterosis\" in allopolyploid plants"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","127"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Molecular Breeding"],["dc.bibliographiccitation.lastpage","138"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Husken, A."],["dc.contributor.author","Baumert, A."],["dc.contributor.author","Strack, D."],["dc.contributor.author","Becker, H. C."],["dc.contributor.author","Mollers, C."],["dc.contributor.author","Milkowski, C."],["dc.date.accessioned","2018-11-07T10:56:25Z"],["dc.date.available","2018-11-07T10:56:25Z"],["dc.date.issued","2005"],["dc.description.abstract","Seeds of oilseed rape (Brassica napus) accumulate high amounts of antinutritive sinapate esters (SE) with sinapoylcholine (sinapine) as major component, accompanied by sinapoylglucose. These phenolic compounds compromise the use of the protein-rich valuable seed meal. Hence, a substantial reduction of the SE content is considered essential for establishing rape as a protein crop. The present work focuses on the suppression of sinapine synthesis in rape. Therefore, rape (spring cultivar Drakkar) was transformed with a dsRNAi construct designed to silence seed-specifically the BnSGT1 gene encoding UDP-glucose:sinapate glucosyltransferase (SGT1). This resulted in a substantial decrease of SE content in T2 seeds with a reduction reaching 61%. In T2 seeds a high and significant correlation between the contents of sinapoylglucose and all other sinapate esters has been observed. Among transgenic plants, no significant difference in other important agronomic traits, such as oil, protein, fatty acid and glucosinolate content in comparison to the control plants was observed. Maximal reduction of total SE content by 76% was observed in seeds of one homozygous T2 plant (T3 seeds) carrying the BnSGT1 suppression cassette as a single copy insert. In conclusion, this study is an initial proof of principle that suppression of sinapoylglucose formation leads to a strong reduction of SE in rape seeds and is thus a promising approach in establishing rape, currently an important oil crop, as a protein crop as well."],["dc.identifier.doi","10.1007/s11032-005-6825-8"],["dc.identifier.isi","000232919000004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50009"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1380-3743"],["dc.title","Reduction of sinapate ester content in transgenic oilseed rape (Brassica napus) by dsRNAi-based suppression of BnSGT1 gene expression"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1934"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Crop Science"],["dc.bibliographiccitation.lastpage","1946"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Zanklan, A. Seraphin"],["dc.contributor.author","Ahouangonou, Salomon"],["dc.contributor.author","Becker, Heiko C."],["dc.contributor.author","Pawelzik, Elke"],["dc.contributor.author","Grueneberg, Wolfgang J."],["dc.date.accessioned","2018-11-07T10:58:49Z"],["dc.date.available","2018-11-07T10:58:49Z"],["dc.date.issued","2007"],["dc.description.abstract","The yam bean (Pachyrhizus spp.) contains three closely related cultivated species: P. tuberosus (Lam.) Sprengel, P. erosus (L.) Urban, and P. ahipa (Wedd.). Its storage root dry matter content (SRDM) is usually low, although genotypes with a high SRDM have been identified ('Chuin' accessions). Flowers are often removed through flower pruning (FP) to increase storage root fresh matter yield (SRFY). The main objectives of this study were to investigate the potential for use in Benin (West Africa), to estimate the effect of FP, and to test whether roots could be processed into gari. In total, 34 accessions were tested at one drought-stress and one irrigated location. Means and genetic variance components were estimated for 33 agronomic traits. Without FP, the SRFYs of P. tuberosus, P. erosus, and P. ahipa were 13.9, 23.4, and 12.4 t ha(-1), respectively, and the seed yields were 2.2, 5.2, and 2.1 t ha(-1), respectively. The FP caused SRFY to increase by 48, 91, and 61% in P. tuberosu, P. erosus, and P. ahipa, respectively. The storage root dry matter yield (SRDY) of P. erosus was only slightly higher (-8.5 t ha(-1)) than that of the Chuin accessions (-8.0 t ha(-1)). Under drought, the SRDY was least affected in P. erosus. Early-maturing P. ahipa accessions were identified. All species could be used to make gari, which contained, on average, 5.5% protein, 58.5% starch, and 23.8% total dietary fiber. The crop has the potential for use in West Africa and has a large genetic variation for genetic improvement."],["dc.identifier.doi","10.2135/cropsci2006.03.0153"],["dc.identifier.isi","000250074800020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50555"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Crop Science Soc Amer"],["dc.relation.issn","0011-183X"],["dc.title","Evaluation of the storage root-forming legume yam bean (Pachyrhizus spp.) under west African conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","75"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","JOURNAL OF APPLIED BOTANY-ANGEWANDTE BOTANIK"],["dc.bibliographiccitation.lastpage","79"],["dc.bibliographiccitation.volume","75"],["dc.contributor.author","Jiang, L."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T09:12:52Z"],["dc.date.available","2018-11-07T09:12:52Z"],["dc.date.issued","2001"],["dc.description.abstract","Apetalous genotypes may be of interest in oilseed rape breeding because of a more efficient photosynthesis and a lower susceptivity to pathogens infecting the petals. Petalous degree was, however, found unstable during flowering. Two types of environmental effects were investigated: (1) developmental stage of the flowers, and (2) application of different phytohormones. Materials used were (1) Fl, BC1, and F2 generations developed from crosses between the German cultivar 'Falcon' and the apetalous mutant 'ap-Tengbe', and (2) double haploid (DH) lines with apetalous, partial apetalous and normal petalled flowers developed by microspore culture of F1 plants ('ap-Renard' x 'ap-Tengbe'). it was observed (1) that petalous degree (PDgr) decreased from initial anthesis to end of flowering both in the partial apetalous and the normal petalled plants originating from the cross between 'Falcon' and 'ap-Tengbe'; and (2) that the supply of auxins or cytokinins resulted in reduction of PDgr in the partial or the normal petalled DH plants. The results suggest that the unstable expression of PDgr was caused by endogenetie accumulation of auxins or/and cytokinins at later flowering stages."],["dc.identifier.isi","000169043200013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27044"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Wissenschafts-verlag Gmbh"],["dc.relation.issn","0949-5460"],["dc.title","Environmental effects on expression of apetalous flowers in oilseed rape"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","182"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Plant Breeding"],["dc.bibliographiccitation.lastpage","184"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Goffman, F. D."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T09:14:56Z"],["dc.date.available","2018-11-07T09:14:56Z"],["dc.date.issued","2001"],["dc.description.abstract","The improvement of the nutritional value and the stability properties of rapeseed oil is partly hindered by the lack of information on the genetic control of tocopherols. The objectives of this investigation ware to characterize the inheritance of tocopherols by using two factorial mating designs (North Carolina Design II, NCII). The first (NCII-A) was produced with two sets of nine parents each, one selected for high and the other for low total tocopherol contents. In the second (NCII-B), each set consisted of six parents, which were either high or low for the alpha/gamma -tocopherol ratio. Parents and F-1 hybrids from both experiments were tested under field conditions in 1998 and 1999 using a completely randomized design with two replications. Only small differences were detected between mean values of parents and F-1 hybrids. General combining ability (GCA) variation in both experiments was highly significant (P < 0.01) for all tocopherol traits. Significant specific combining ability (SCA) effects were only detected for -tocopherol in NCII-A and therefore for the alpha-/gamma -tocopherol ratio. These results indicate that tocopherol contents and composition are controlled mainly by genes with additive effects. Interactions of F-1 hybrids and GCA effects with the environment were significant for only tocopherol contents and not for tocopherol composition."],["dc.identifier.isi","000168961500016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27548"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Wissenschafts-verlag Gmbh"],["dc.relation.issn","0179-9541"],["dc.title","Genetic analysis of tocopherol content and composition in winter rapeseed"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","398"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Plant Breeding"],["dc.bibliographiccitation.lastpage","399"],["dc.bibliographiccitation.volume","123"],["dc.contributor.author","Baye, T."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T10:47:03Z"],["dc.date.available","2018-11-07T10:47:03Z"],["dc.date.issued","2004"],["dc.description.abstract","Vernonia galamensis is a potential new industrial crop growing wild in Ethiopia. The seed oil is rich in vernolic acid, an epoxy fatty acid, which is of interest for oleochemical uses. Basic information on the reproductive system of Vernonia is still very limited. The amount of natural outcrossing was estimated at two locations in Ethiopia (Alemaya and Babile) using flower colour as a marker. Single plants with white flowers, which is a monogenic recessive trait, were planted in plots with normal pink flowers and the outcrossing rate was estimated from the frequency of pink-flowered plants in the progeny of the white-flowered plants. Estimates of the natural outcrossing rate ranged between individual plants from 3.5 to 16% at Alemaya and 2.5 to 12% at Babile. Vernonia galamensis can be classified as a mainly self-pollinated species."],["dc.identifier.doi","10.1111/j.1439-0523.2004.01001.x"],["dc.identifier.isi","000222944700020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/47884"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Verlag Gmbh"],["dc.relation.issn","0179-9541"],["dc.title","Natural outcrossing rate in Vernonia galamensis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","203"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Crop Science"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Horneburg, Bernd"],["dc.contributor.author","Becker, Heiko C."],["dc.date.accessioned","2018-09-04T12:35:39Z"],["dc.date.available","2018-09-04T12:35:39Z"],["dc.date.issued","2008"],["dc.description.abstract","On-farm management of landraces or older cultivars of crop plants is often recommended to combine conservation and use of genetic resources, but experimental studies on on- farm management are hard to fi nd, particu- larly in industrialized countries. To investigate whether on-farm management results in regional adaptation and enhances crop biodi- versity, an experiment with lentils (Lens culi- naris Medik.) was designed. Lentil production has almost ceased to exist in central Europe, but lentils may still be found in gene banks and have remained a popular food. Three landraces were evaluated on three farms in Germany; at each farm, three populations evolved, based on three selection methods: (i) natural selection, (ii) visual mass selection, and (iii) selection for yield of single plant progenies. These selection methods were applied for two to four years. The nine populations developed for each landrace (three methods × three locations) were grown in a comparative trial on two of the farms. In most cases, populations selected at a specifi c location were at this location superior in yield to populations selected at other locations, indi- cating that on-farm management can result in site-specifi c adaptation. Signifi cant changes in morphological and phenological traits occurred. For one landrace, natural selection increased seed weight. The response to different selec- tion methods largely depended on landrace and selection site, and no method was generally superior. In conclusion, on-farm management is a useful approach to maintain, use, and develop plant genetic resources. Natural selection as the most cost-effi cient method is recommended."],["dc.identifier.doi","10.2135/cropsci2007.03.0170"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15656"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Crop Adaptation in On-Farm Management by Natural and Conscious Selection: A Case Study with Lentil"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1444"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Crop Science"],["dc.bibliographiccitation.lastpage","1449"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Schierholt, Antje"],["dc.contributor.author","Rucker, B."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T08:40:44Z"],["dc.date.available","2018-11-07T08:40:44Z"],["dc.date.issued","2001"],["dc.description.abstract","High oleic (HO) winter oilseed rape (Brassica napus L.) with increased oleic acid content in the seed is of interest for nutritional and industrial purposes. The objectives of the present study were to (i) describe the fatty acid composition in the seed, leaf, and root material of eight HO mutants; (ii) estimate the number of genes controlling the trait; (iii) test whether the mutants are allelic for the mutated loci; and (iv) determine the inheritance of the HO trait. An 8-by-8 diallel of the HO mutants and two crosses between HO mutants and a normal type cultivar with their segregating F, and BC generations were used. The results suggested that the variation in oleic acid can be explained by two mutation events. One mutated locus (HO1) was expressed mainly in the seeds and all mutants were assumed to be allelic at this locus. A second mutated locus (HO2), which increased the oleic acid content not only in the seed but also in leaves and roots, was identified in one mutant line. Both loci showed mainly additive effects: for HO1 a = 8.0 +/- 1.5 and for HO1+HO2 a = 9.25 +/- 1.5 (in percent oleic acid in the seed oil). Only small nonsignificant dominance effects and no epistatic or maternal effects were observed. The reduction of oleic acid desaturation in the mutants indicates that the HO1 locus is equivalent to fad2, the microsomal oleic acid desaturase, whereas the locus HO2 affects a different enzyme involved in fatty acid biosynthesis or desaturation."],["dc.identifier.isi","000176236800012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19303"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Crop Science Soc Amer"],["dc.relation.issn","0011-183X"],["dc.title","Inheritance of high oleic acid mutations in winter oilseed rape (Brassica napus L.)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","805"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Genetic Resources and Crop Evolution"],["dc.bibliographiccitation.lastpage","811"],["dc.bibliographiccitation.volume","52"],["dc.contributor.author","Baye, T."],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T10:54:37Z"],["dc.date.available","2018-11-07T10:54:37Z"],["dc.date.issued","2005"],["dc.description.abstract","Vernonia galamensis is a new potential industrial crop with very high content of vernolic acid in the seed oil. The species is known to naturally grow as a weed in fields or in woodlands under a wide range of agroecological conditions of Africa. In order to study the existing variability in Ethiopia, germplasm collection was carried out. Vernonia grows wild in various ecosystems. Ten regions were explored from North, South, East, Southeast, Southwest and Central Ethiopia. A diverse range of habitats having different altitudes and ecological conditions was explored. Altitude of collecting sites varied between 1250 and 2050 m, and soil pH from 5.1 to 8.5. The most common soil type was sandy loam, and the organic matter content varied from 0.2% to 12.9%. At 80 sites, about 480 accessions were collected including different maturity time, plant type, flower color, and branching patterns as well as fatty acid composition. The mean vernolic acid content of the seed oil of the accessions was 74%, and ranged from 34% to 87%. A wide variability in composition of other fatty acids was observed. It was not possible to find Vernonia in some locations that were earlier indicated by herbarium specimens collected since 1840. This could be a sign of change in land use system and environmental degradation and, hence, loss of genetic resources of the species."],["dc.identifier.doi","10.1007/s10722-003-6086-5"],["dc.identifier.isi","000234591100002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49608"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0925-9864"],["dc.title","Exploration of Vernonia galamensis in Ethiopia, and variation in fatty acid composition of seed oil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","63"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Plant Breeding"],["dc.bibliographiccitation.lastpage","66"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Schierholt, Antje"],["dc.contributor.author","Becker, H. C."],["dc.date.accessioned","2018-11-07T09:26:11Z"],["dc.date.available","2018-11-07T09:26:11Z"],["dc.date.issued","2001"],["dc.description.abstract","Winter oilseed rape, with high oleic (HO) acid contents (C18 : 1) is of interest for nutritional as well as for industrial purposes. HO mutants have been described, but only limited information is available on any environmental influence on the expression of oleic acid content in these mutants. Therefore, a population of 60 doubled-haploid (DH) lines segregating for oleic acid content (56-75% C18 : 1) was grown in two years at three locations in northern Germany. Analysis of variance revealed a high heritability for oleic acid content of h(2) = 0.99. Subdivid ing the DH population into a high (> 64% C18 : 1) and a low ( < 64% C18 : 1) oleic acid class showed high heritabilities (h(2) = 0.94) for C18 : 1 contents within both the high and low oleic acid types. The oleic acid contents in HO types of winter oilseed rape were environmentally stable at the three locations tested."],["dc.identifier.doi","10.1046/j.1439-0523.2001.00549.x"],["dc.identifier.isi","000167407300011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30242"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Wissenschafts-verlag Gmbh"],["dc.relation.issn","0179-9541"],["dc.title","Environmental variability and heritability of high oleic acid content in winter oilseed rape"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]