论文部分内容阅读
1.棉花品种混杂退化原因(1)机械混杂种子田在进行种、收、运、脱、晒、藏等作业时操作不严,混进其他品种的种子。此外,在不合理的田间管理情况下也会造成机械混杂。(2)生物混杂种子田未与其他品种棉花田适当隔离,发生了天然异交。(3)品种遗传性变化或自然突变新品种投入生产后,由干内在因素的差异,材料本身便不断发生变化,品种的某些基因型也会发生分离,使表现型由一致变为不一致,打破了特征特性,就会出现植株高、矮,成熟早、晚,抗性和适应性减弱,产量降低,品质变劣等退化现象。(4)不正确的选择方法在棉花种子田,由于不了解选
1. Reasons for the deterioration of cotton varieties mixed (1) mechanical hybrid seed fields in the species, collection, transportation, off, drying, storage and other operations lax, mixed with other varieties of seeds. In addition, mechanical confounding can also be caused by unreasonable field management. (2) The biological hybrid seed fields were not properly segregated from other cotton fields, and natural outcrossing occurred. (3) Genetic Variation or Natural Mutation After the new varieties are put into production, due to the difference of internal factors, the materials themselves will continue to change. Some of the genotypes will also be separated and the phenotypes will change from unanimous to inconsistent. Breaking the characteristics of the characteristics, there will be plant height, short, mature early, late, resistance and adaptability weakened, yield decline, deterioration of quality degradation. (4) incorrect selection method in the cotton seed field, due to not understand the election