Phosphorus nutrient characteristics of different maize inbreds with tolerance to low-P stress
2005
Zhang Limei,He Liyuan,Li Jiansheng
Китайский. 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。
Показать больше [+] Меньше [-]Английский. 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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