低磷胁迫下玉米自交系配合力分析  

Evaluation of the Combining Ability of Maize Inbred Lines Under Low Phosphorus Stress

作　　者：陈范骏[1] 米国华[1] 张福锁[1] 

机构地区：[1]农业部植物营养学重点实验室教育部植物-土壤相互作用重点实验室中国农业大学资环学院,北京100094

出　　处：《玉米科学》2006年第3期74-77,共4页Journal of Maize Sciences

基　　金：农业部"948"项目(2003-Z53)

摘　　要：缺磷是限制作物生产的重要因素之一。通过遗传改良提高玉米杂交种的磷吸收利用能力,是提高磷肥利用率的一条重要途径。本研究利用磷肥长期定位田,在前期磷高效自交系筛选的基础上,对低磷胁迫下玉米自交系的配合力进行分析,以期为磷高效育种选择亲本提供依据。研究结果表明,鲁原92×7922为高磷高效型杂交组合,减产率达67.2%;Mo17×7922为低磷高效型杂交组合,减产率只有3.5%。耐低磷育种中,高配合力自交系为CA200和Mo17;低配合力自交系为丹黄02、107、原引1号、鲁原92、3189、Oh43和黄C;中配合力自交系为91041-1、CA170、L种和7922。低磷条件下,组合产量与空秆率、成熟期熟相呈负相关,即早熟型且空秆少的玉米品种较为耐低磷胁迫。Low phosphorus（P） stress is one of the major limiting factors in crop productivity. Breeding for P-efficient cuhivars is a promising way to increase P fertilizer use efficiency. Based on the preliminary work on selection P-efficient inbreds on a long-term P fertilizer experimental field, the combining ability of selected inbreds was evaluated under low P stress. It was shown that the yield of hybrid 92 × 7922 was only high at high P, while at low P, it reduced by 67.2%. On the contrary, hybrid Mo17 × 7922 was tolerant to low P with low yield reduction rate（3.5%） at low P. For breeding low P- tolerant hybrids, inbred CA200 and Mo17 had higher combining ability, while the combining ability of inbreds Danhuang02, 107, Yuanyin 1, Luyuan 92, 3189, Oh43, Yellow C was low. That of 91041-1, CA170, L-race, 7922 was in the intermediate. At low P, the yield of maize hybrids had a negative close relationship with barren-cob ratio（percentage of plants with infertile cob in total plants per hectare） and duration of growth period, that is, early-mature cultivars with low barren-cob ratio tend to be more tolerant to low P stress.

关 键 词：玉米 自交系 低磷胁迫 配合力 

分 类 号：S513.01[农业科学—作物学]