使栽培品种每年在各种环境中都能保持高产,是作物育种程序考虑的重点。培育持续稳定高产的基因型,需要在低、高两种环境胁迫下筛选。产量变异可归因于各种自然发生的胁迫。能适应特殊胁迫环境如水分和氮肥的基因型,在粒用高粱中曾有过论证(Garrity 等,1982;Zweifel 等,1987)。Heinrich 等(1983)提出,在各种胁迫条件下保持粒重是基因型产量稳定性的一个重要因素。对不同作物打叶已用于研究产量和产量构 Keeping cultivars highly productive in all environments every year is a key consideration in crop breeding programs. To cultivate a stable, high-yielding genotype, we need to screen under low and high environmental stress. Yield variability can be attributed to a variety of naturally occurring stresses. Genotypes that adapt to specific stress environments such as moisture and nitrogen fertilizers have been demonstrated in grain sorghum (Garrity et al., 1982; Zweifel et al., 1987). Heinrich et al. (1983) suggested that maintaining grain weight under various stress conditions is an important factor in the stability of genotypic yield. Fragmentation of different crops has been used to study the yield and yield structure