论文部分内容阅读
在美国北部由于有限型大豆产量高,并且抗倒伏,人们很乐意种植这种类型的大豆。该类型株高大约为无限型品种株高的一半。此研究的目的是估计开花期和成熟期以及这两个时期株高的遗传力,并评价这些性状间的关系以估计选择早花、高的有限型植株的可能性。采用源自PI 407711B×PI 360835和PI 417398×PI 423882A两个杂交组合的有限型群体,1984年与1985年在伊利诺斯州厄巴纳的弗拉纳根肥沃粘土上分别研究了这两个群体的F_3和F_4代(各包括42和43个家系)。每年每一群体均采用两次重复的随机完全区组设计。利用亲子回归估计出开花期,成熟期以及在这两个时期株高的遗传力是高的(0.67—1.21),但群体1开花期的遗传力除外(0.49)。由开花期、成熟期与株高间基因型和表现型的正相关表明,根据早开花来获得高的有限型植株是困难的。开花后主茎生长持续一周或更长时间,开花期株高大约为最后株高的80％。这样,对有限型大豆在开花期对株高的选择可能是有效的。
In the northern part of the United States, people are happy to grow this type of soy because of their limited soybean yield and lodging resistance. This type of plant height is about half the height of an infinity variety. The purpose of this study was to assess the heritability of flowering and maturity and plant height in these two periods and to evaluate the relationship between these traits to estimate the probability of selecting early-flowering, high-limiting plants. Using a finite population derived from two crosses of combinations of PI 407711B × PI 360835 and PI 417398 × PI 423882A, these two were studied separately on Flanagan fertile clay in Urbana, Illinois in 1984 and 1985 Groups of F_3 and F_4 generations (each comprising 42 and 43 pedigrees). Each population uses a randomized complete block design with two replications each year. Parental regression estimated that heritability at flowering, maturity, and plant height was high (0.67-1.21) at flowering, maturity, and heritability in both periods except for heritability at population 1 flowering (0.49). The positive correlation between the genotypes and phenotypes at anthesis, maturity and plant height suggests that it is difficult to obtain high, limited type plants based on early flowering. The main stems grow for a week or more after flowering, and the flowering stage height is about 80% of the final plant height. In this way, the choice of plant height may be effective at the flowering stage for limited-type soybeans.