关键词: 杂种优势[45CC], 小麦[49EJ, 61DA], F₂杂种, 对照优势, 作物育种[49DD]

Abstract: The latent usable valuable F₂ heterosis in wheat was expounded by the yield analysis of 25 hybrids obtained from an 5×5 imcomplete diallel cross. The F₂ strong-heterosis hybrids were produced between the pure varieties or strains with complicated genetic basis, good comprehensive characters and high combining ability. The even degree of F₂ population was increased by means of selecting the parents, which have the differences of not over 4.43 days and 5.2cm in the heading period and the plant height respectively, except showing on differences basically in awn, shell color and kernal color etc. The F₂ hybrids from the selfing of F₁ hybrids were used in production. The F₁ hybrids were acquired through the technique of producing seeds using maternal male steriles induced by the chemical hybrid agent(CHA) Sc2053.

Key words: HETEROSIS, WHEATS, F₂ HYBRID, CONTRASTIVE HETEROSIS, CROP BREEDING