Heterosis for biomass yield and related traits in five hybrids of Arabidopsis thaliana L. Heynh

被引:78
作者
Barth, S [1 ]
Busimi, AK [1 ]
Utz, HF [1 ]
Melchinger, AE [1 ]
机构
[1] Univ Hohenheim, Inst Plant Breeding Seed Sci & Populat Genet, D-70599 Stuttgart, Germany
关键词
heterosis; Arabidopsis thaliana; reciprocal effects; genetic distances;
D O I
10.1038/sj.hdy.6800276
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Heterosis is of utmost economic importance in plant breeding. However, its underlying molecular causes are still unknown. Given the numerous advantages of Arabidopsis thaliana as a model species in plant genetics and genomics, we assessed the extent of heterosis in this species using five hybrids derived from five ecotypes. Parents, F-1 and F-2, generations in both reciprocal forms were grown in a greenhouse experiment with four replications. Mid-parent heterosis (MPH) and best-parent heterosis (BPH) averaged across hybrids were surprisingly high for biomass yield (MPH: 60.3%; BPH: 32.9%) and rosette diameter (MPH: 49.4%; BPH: 34.8%), but smaller for flowering date (MPH: 27.5%; BPH: 18.5%), seed yield (MPH: 18.9%; BPH: 1.7%), and yield components. Individual hybrids varied considerably in their MPH and BPH values for all traits, one cross displaying 140.1% MPH for biomass yield. MPH was not associated with parental genetic distance determined from molecular markers. Reciprocal effects were significant only in a few cases. With a proper choice of hybrids, our results encourage the use of Arabidopsis as a model species for investigating the molecular causes of heterosis.
引用
收藏
页码:36 / 42
页数:7
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