不同倍性麦类作物HI和NHI的杂种优势及其与产量的关系

Heterosis of HI and NHI in T.durum,T.aestivum and Triticale

通过对硬粒小麦(AABB)、普通小麦(AABBDD)六倍体小黑麦(AABBRR)和八倍体小黑麦(AABBDDRR)不同组合收获指数(HI)和氮收获指数(NHI)及有关性状杂种优势的研究表明:除八倍体小黑麦外,其它倍性材料不同组合的 HI 表现不同程度杂种优势,NHI 在不同倍性均表现杂种优势;单株条件下经济产量和生物产量的关系大于和收获指数的关系;氮收获指数与经济产量相关显著,与籽粒含氮量相关不显著,利用 NHI 作为提高氮素利用效率的指标是可行的。

Spring and winter tetraploid wheat(Triticum durum,AABB),winter hexaploid wheat (Triticum aestivum,AABBDD).spring and winter hexaploid trticale(AABBRR)and spring octoploid triticale were used to investigate the level of heterosis of HI and NHI,and to anlysis their relation to yield and other traits in each of six groups.The results indicate that HI and NHI have heterosis in all investigat- ed groups;Biomass yield per pland acts more important rule on grain yield per plant that HI;NHI has sig- nificantly related with grain yield per plant but no significently with grain nitrogent content.It implixes that NHI can be used as a good selected indication considering yield and grain protent content.