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用小麦抗赤霉病基因库原始群体中不育株和可育株的农艺性状进行两轮表型选择.结果表明两轮选择显著地降低改良群体的株高,而单株穗数和产量略有增加。相关农艺性状呈程度不等的正向或负向相关变异。对不育株的两轮选择降低了株高、穗长的遗传方差,而增大和维持了单株穗数、粒数和产量的遗传方差。对可育株的两轮选择降低了群体所有性状的遗传方差。
Two rounds of phenotypic selection were conducted using the agronomic traits of the sterile and fertile plants from the original population of the wheat head blight resistance gene bank.The results showed that two rounds of selection significantly reduced the plant height of the improved population while the number of panicles per plant and yield There is increase. The related agronomic traits showed positive or negative correlation variation with different degrees. Two rounds of selection of sterile plants reduced the genetic variance of plant height and spike length, and increased and maintained the genetic variance of spike number, grain number and yield per plant. Two rounds of selection of fertile plants reduced the genetic variance of all traits in the population.