| 同耐低磷基因型玉米磷营养特性研究 |
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| 引用本文： | 张丽梅,贺立源,李建生,徐尚忠.同耐低磷基因型玉米磷营养特性研究[J].中国农业科学,2005,38(1):110-115. |
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| 作者姓名： | 张丽梅 贺立源 李建生 徐尚忠 |
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| 作者单位： | 华中农业大学资源环境学院 |
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| 摘 要： | 采用盆栽试验系统研究了不同耐低磷特性的5个玉米自交系在生长过程中苗期、拔节期、孕穗期和吐丝期的磷营养特性。结果表明，在玉米苗期和拔节期，磷吸收效率是决定耐低磷特性的主要变异来源，低磷胁迫下，耐低磷自交系99180和99239植株相对吸磷量均显著高于敏感自交系99152。孕穗期，玉米自交系耐低磷特性主要体现在上部叶磷累积量较高，能保证玉米后期正常生长发育。吐丝期，耐低磷自交系99180和99239即使在低磷胁迫下，磷吸收效率和再分配效率仍明显高于敏感自交系99152。不同耐低磷自交系的磷营养特征也存在差异，99239主要表现为吸收效率较高，而99180则表现出更强的再分配能力。
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| 关 键 词： | 玉米 基因型 耐低磷 营养特性 |
| 收稿时间： | 2004-5-10 |
Phosphorus Nutrient Characteristics of Different Maize Inbreds with Tolerance to Low-P Stress |
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| Abstract: | Nutrient characteristics of phosphorus in different maize inbred lines with tolerance to low-P stress were studied at stages of seedling, jointing ,earing, silking in a pot experiment. In the periods of seedling and jointing P uptake efficiency is the main contributor to P tolerance, and the relative P content in 99180 and 99239 (both are P-tolerant genotypes) are higher than that in 99152 (P-sensitive genotype). At earing stage P-resistant genotypes, compared to P-sensitive ones, have higher accumulation of P in upper leaves. At silking stage, P uptake and reallocation efficiency of P-tolerant genotypes are higher than those in 99152. The results also suggested that there are different mechanisms of P nutrient characteristics even in different P-tolerant genotypes. Inbred line 99239, according to the investigation, is considered as an efficient stock in the P-uptake while 99180 falls to the efficient stock of P reallocation. |
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| Keywords: | Maize Genotypes Tolerance to low-P stress Nutrient characters |
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