籼型光敏感核不育系的选育与利用研究 Ⅰ.光敏感核不育基因导入籼稻的效果

从１９８２年开始，以湖北光敏核不育水稻原始株农垦５８Ｓ为ＰＧＭＳ基因的供体，用不同的籼稻品种进行单交、复交或回交。研究了ＰＧＭＳ基因导入籼稻背景的效果，单交Ｆ２的入选频率为０．００６４％，回交或复交Ｆ２的入选频率为０．０１５５％。通过定向选择和育性鉴定，已从复交后代选育出Ｗ６１５４Ｓ、Ｗ７４１５Ｓ、Ｗ６１８４Ｓ、Ｗ６１１１Ｓ和Ｗ６４３４Ｓ等釉型光敏感核不育系。其农艺性状一致，育性稳定， ＰＧＭＳ基因在武汉自然光温条件下能完全表达。 发现在 ７日 １０ 日左右和 ９月１０日左右有两个育性转换期。这一发现扩大了光敏感核不育水稻的应用价值和范围。已育成的不育系属于长江流域的早稻和中稻。

STUDIES ON THE SELECTION AND UTILIZATION OF INDICA TYPE PHOTOPERIOD-SENSITIVE GENIC MALE STERILE LINES. I. Effectiveness of conducting the PGMS genes into the Indica type rice varieties

Various Indica type rice varieties have been single-crossed, multiple-crossed or backcrossed with Nongken 685. the Japonica donor of photoperiod-sensitive genie male sterile (PGMS ) genes .since 1982. The effectiveness of conducting the PGMS-genes from the Japonica rice into the Indica rice genetic background was studied. The selection frequency in F2 from single-crossing was 0.0064%, and that in F2 from multiple. crossing and backcrossing was 0.0185%.W6154S. W7416S. W6184S, W6111S and W6434S were developed from the progenies of multiple-crossing through directional selection and fertility identification. These Indica photoperiod-sensitive genie male sterile lines ate uniform in agronomic traits and stable in fettility.They are belong to the early or medium rice in the Valley of, Yangtze River. The photoperiod-sensitive genie male sterile genes in these lines can completely express under the natural condition in Wuhan.It is found that these indica photoperiod-sensitive genie male sterile lines have two fertility- transfotming periods in fertility, about JulY 10 and September 10. respectively.These results will widen tile utilization range and raise the value of the PGMS rice.