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西瓜为虫媒异花授粉作物,在不加隔离和选择的情况下,2～3年即混杂退化,失去品种本来面貌,致使果位变高,成熟参差不齐,产量降低,品质变劣,商品价值下降。数量遗传学家Falconer认为,良种繁育的任务是保存群体的遗传性,其法宝是隔离和选择。一般采用单株选择与混合选择相结合的方法,对选择后代进行考察,但又要避免遗传基础的狭窄。据此,我们于1985～1987年对西瓜“单株选择自交,半分比较鉴定,择优集团繁殖”提纯保纯方法,进行了试验研究,已取得了一定效果。一、材料与方法 (一)材料:以郑州3号、中汴1号两个常规
Watermelon cross-pollination of insect-resistant plants, without isolation and selection of the case, 2 to 3 years that hybrid degeneration, loss of the original appearance of the species, resulting in high fruit positions, mature uneven, lower yield, poor quality, The value of the goods is declining. The number of geneticists Falconer believes that the task of breeding is to preserve the heritability of the population, the magic of which is isolation and selection. In general, the combination of single plant selection and mixed selection is used to investigate the selection of offspring, but the genetic basis should be avoided. Based on this, we conducted a pilot study on the purification and purification methods of watermelon “self-selection of single plant, identification of half a part, breeding of selective group ” from 1985 to 1987, and achieved some results. First, materials and methods (A) Material: Zhengzhou No. 3, Chungli No. 1, two conventional