两系法品种间和亚种间杂种优势的比较研究  

A Comparative Study on the Heterosis of Intervarietal Hybrids and Intersubspecific Hybrids by Two-line System

作　　者：刘建丰[1] 罗越华[1] 

机构地区：[1]湖南农业大学农学系,海南省农业科学研究院

出　　处：《杂交水稻》1996年第2期19-22,共4页Hybrid Rice

摘　　要：通过时２４个两系法籼粳亚种间组合、１０个品种间组合杂种一代优势的比较分析，得出以下结论：（１）亚种间杂种一代单株粒重优势明显大于品种间杂种一代；（２）品种间杂种一代主要靠穗数和粒数增加而增产，亚种间杂种一代主要靠粒数和千粒重增加而增产；（３）亚种间杂种一代株高优势明显大于品种间杂种一代，但株高在一定范围内（１０４．３±９．１８）与产量呈显著正相关；（４）亚种间杂种一代抽穗日数优势指数与品种间杂种一代没有显著差异，说明选择合适父母本，可配组出生育期适宜的亚种间组合；（５）亚种间杂种一代结实率和充实系数的平均数、优势指数均与品种间杂种一代没有显著差异，表明在广亲和基因参与下，父本充实系数正常时，亚种间杂种一代的结实率和充实度完全可达正常水平。A comparative study on the heterosis of 24 intersubspecific hybrids and 10 intervarietal hy-brids was conducted in 1992.The results showed that:(1) Grain weight per plant of the intersubspecifichybrids was significantly(at 5% level ) greater than that of the intervarietal hybrids;( 2) The heterosis ofplant height of the intersubpecific hybrids was much greater, and within a certain range (104.3±9. 18 cm),the plant height had a positive correlation with grain weight per plant in the intersubspecific hybrids;(3)The heterosis in the number of days from seeding to heading had not much difference between the intersub-spcific hybrids and the intervarietal hybrids;(4)The spikelet fertility and the heterosis in grain filled coeff-cient of the intersubspecific hybrids with the background of wide compatability hadn’tstatistical differencecomparing with those of the intervarietal hybrids.

关 键 词：亚种间杂交 杂种优势 杂交水稻 

分 类 号：S511.103.5[农业科学—作物学]