几个玉米自交系和杂交种耐低磷能力的研究

采用水培法对玉米自交系和杂交种进行了耐低磷能力指标鉴定,提出了利用耐低磷综合指数评价不同材料耐低磷能力的方法。结果表明,低磷胁迫对玉米幼苗形态表现、干物质积累、磷积累量及磷利用效率均有显著影响,但不同指标对不同玉米基因型的影响程度并不一致。综合指数分析结果,自交系698-3H和杂交种正红6号的综合耐低磷能力较强,分别属于磷高效利用型和高效吸收型;自交系K335和杂交种正红115的综合耐低磷能力较弱。

Study on the Ability of Low Phosphorus Tolerance of Some Maize Inbred Lines and Hybrids

Study on the ability of low phosphorus tolerance of maize inbred lines and hybrid varieties by hydro-culture were conducted, and evaluated the ability of low phosphorus tolerance with different maize by composite tolerant low-P index. The result showed that low phosphorus stress had a significant effect on physiological characteristic of maize seedling, dry matter accumulation, P-accumulation and P-utilization efficiency, but the impact degree of different indexes on different maize genotypes were incongruous. The result of composite tolerant low-P index showed that composite ability of low phosphorus tolerance of inbred lines 698-3H and hybrid varieties Zhenghong6 were better, which belonged to high utilizing of phosphorus and high absorption of phosphorus separately. However, composite ability of low phosphorus tolerance of inbred lines K335 and hybrid varieties Zhenghong115 were inferior.