论文部分内容阅读
最近,我们收到一些读者的来信,询问玉米SC—704、西瓜红优二号杂种第二代(自己收留的种子)能否于第二年再作种用?为此,这里选登“玉米杂种一代与二代对比试验”一文,帮助大家认识这一问题,以便更好地指导农业生产,夺取农业生产的丰收。 杂种优势是生物界的普遍现象。在农作物优良品种的培育过程中,常采用杂文的手段,培育优良高产的杂交种,从而取得农作物更高的产量。杂种优势是指两个遗传组成不同的亲本杂交产生的杂种第一代,在生长势,生活力,繁殖力、抗逆性、产量和品质上比其双亲(母本和父本)优越的现象。因此,农业生产上则总是利用杂种第一代。根据性状遗传的基本规律,杂种第二代必将出现性状的分离和重组,使杂种第二代在生长势、生活力、抗逆性和产量等方面都显著地劣于杂种第一代,即所谓衰退现象。所以,在杂种优势利用上,杂种第二代一般不再利用,必须重新配制杂种,才能满足生产的需要。
Recently, we received a letter from some readers asking whether the second generation of hybrid seeds of SC-704, Red Watermelon II (their own seeds) could be planted the following year. For this reason, we chose “Corn Hybrid generation and second-generation comparative test ”article, to help everyone understand this problem, in order to better guide agricultural production, capture the bumper harvest of agricultural production. Heterosis is a common phenomenon in the biological world. In the cultivation of fine varieties of crops, often use essays means to cultivate good and high yield hybrids, so as to obtain higher crop yields. Heterosis refers to the phenomenon that the first generation of hybrids produced by two genetically different parents are superior to their parents (maternal and paternal) in growth vigor, viability, fecundity, resistance, yield and quality . Therefore, the first generation of hybrids is always used in agricultural production. According to the basic rules of trait inheritance, the second generation of hybrids will inevitably appear segregation and reorganization of traits, so that the second generation hybrids are significantly inferior to the first generation of hybrids in terms of growth potential, viability, resistance and yield The so-called recession. Therefore, in hybrid utilization, the second generation of hybrids generally no longer use, must be reconfigured hybrids, in order to meet production needs.