水稻收获指数相关性状的研究

广东省农科院水稻研究所育成的水稻品种粤香占在9 000 kg/hm2的条件下收获指数达到0.6以上,比普通品种提高约0.1.以粤香占为材料、七丝占(收获指数为0.4)为对照进行水稻收获指数相关性状研究,结果表明:获得高收获指数不是仅靠增加单株产量,而要在增加单株产量的同时适当增加抽穗前植株高度使茎叶重达到一定的程度,同时使始穗期后物质运输主要贡献在穗部,而非茎长增量;收获指数遗传力极低,表现为典型的数量性状特点,各收获指数有关性状间关系十分复杂,茎长增量、始穗株高和成熟株高也许可作为间接影响收获指数的要素.

Studies on inheritance of the traits related to harvest index in rice

Yuexiangzhan was bred by Rice Research Institute of Guangdong Academy of Agricultural Science.Its harvest index is reported more than 0.6,0.1 higher than common rice varieties,when it yielded at 9 000 kg/hm2.The inheritance of harvest index in Yuexiangzhan is studied,with Qisizhan as control(its harvest index is 0.4).The results show that in order to obtain high harvest index,only increase the single output is not enough,but to increase the plant height and promote the stem and leaf grow to a certain degree before heading as well,Besides,it's necessary to atuate the material transport at initial heading mainly contributed at ear,but not stem increment. The harvest index has very low heritability and is a typical quantity trait.The relationships between varied traits related with harvest index are very complicated.Stem increment and plant height at both initial heading and maturity may be indirectly related to harvest index.