稻与李氏禾属间远缘杂交初步研究

采用幼胚培养和延续授粉法,使稻×李氏禾属间远缘杂交获得成功.幼胚培养成株率为26%.延续授粉杂交成胚率约为19%,比常规1次授粉杂交提高14%,并且可以直接获得结实饱满的杂种种子,平均结实率为6.2%.1985-1989年共获得 F_1绿苗236株,成株108株.从杂交后代已获得双胚菌、雄性不育、高柱头外露和高抗稻瘟病的育种种质.

Premary Study on Wide Cross Between Oryza and Leersia

By means of the young embryo culture and the continual pollinating,the hybridization between Oryza and Leeria has been acheived successfully.On the average,twenty-six percent of cultured embryos germinated to green seedlings.Ninety percent of total pollinated spikelets produces young embryos by con- tinual pollination,which is 14% higher than that produced by the conventional method(i.e.pollinating once),and 6.2% of spikelets developed to normal seeds.From 1985 to 1989,two hundred and thirty-six green seedlings were obtained and one hundred and eight of them survived after being transplanted to the field. From the generations derived from the crossed of rice×Leeria,lots of segregating plants with some benifitial characters such as double-embryo seed,male sterile,high stigma exsertion and high resistance to rice blast were selected,which could be useful to rice breeding program in the future.