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近两年耒,在杂交水稻推广过程中,由于不育系回交世代增加,隔离不严,混杂异品种授粉,以致株型、育性、熟期等主要经济性状,出现分离,有的很严重,特别是不育系的育性,典败变为园败,甚至出现染色花粉粒,套袋能自交结实等现象,使配制的杂交种优势下降,甚至比双亲减产。 1975年春,我们在海南崖城对新育成珍汕97A第9代回交植株采取单株成对套袋配种繁殖不育系种子,夏季将此种子带回本所繁殖,做原原种。同年冬到1976年春,再将原原种进行回交,加代繁殖为原种。1976年夏在吉安将原种繁殖为不育系良种,为回交
In the past two years, during the popularization of hybrid rice, some major economic traits such as plant type, fertility and maturity appeared segregation due to the increase of backcross generations of male sterile lines, laxity of isolation and pollination of different varieties, Serious, especially the fertility of sterile lines, the classic defeat into a garden, or even pollen grains, bagging can be self-bred and so on, so that the advantages of hybrids decreased, or even less than their parents cut. The spring of 1975, we in Hainan Yacheng on the newly-formed Zhenshan 97A 9th generation backcross plants take single plant bagged bagged breeding sterile seeds, in summer this seed back to the breeding, the original seed. The same year winter to 1976 spring, and then back to the original seed, plus the original breeding species. In the summer of 1976, the original breed as a male sterile line in Ji’an