高产优质稻的选配及初试研究

CROSS COMBINATIONS OF RICE AND PRELIMINARY SELECTION FOR HIGH YIELD AND GOOD QUALITY

1995年以来 ,针对生产上育推的冈优米质一般 ,Ⅱ优生育期偏长 ,在抽穗扬花期常遇高温伏旱 ,影响结实和产量 ,汕优亲本回交多代 ,抗性和优势逐渐减弱的情况 ,先后对籼与籼、籼与粳、水与旱稻间杂交和多个不育系与恢复系配制 ,从中试验出优良的Nj7A× 95 -

Since 1995, the rice varieties of 'Gangyou', 'II You' and 'Shanyou' have been widely cultivated in Chongqing. However, seed quality of Gangyou is not satisfactory, the growth period of II You lasts too long and the stress resistance and heterosis in Shanyou are declining owing to backcrosses. In order to tackle these problems, a number of cross combinations were made of indica × indica, indica × japonica and paddy rice × upland rice and of sterile line × restoring line. A promising parent variety with high-yield potential and good seed quality, Nj7A/95-2, was identified.