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作 者 ：黄爱缨,蔡一林,滕中华,木志坚,王三根.

期 刊 ：中国生态农业学报 2008年 16卷 6期 页码：1419-1422

关键词：玉米自交系；苗期根系；低磷胁迫；生理特性；

Keywords:Maize inbred line, Seedling root, Low-P stress, Physiological characteristics,

摘 要 ：以磷高效型04419和磷低效型04065玉米自交系为材料，研究了砂培试验条件下，二者在需磷临界期（苗期）的根系生理特性差异。低磷处理下，4～8叶期磷低效型04065玉米根系酸性磷酸酶（APase）活性显著高于磷高效型04419玉米，而其根系磷含量显著低于04419，表明根系APase水平能够反映不同基因型玉米磷效率的差异。当低磷处理至6～8叶期，除根冠比外，二者根系APase、根系活力、根系丙二醛（MDA）、根系总长和干物质积累差异显著，表明不同基因型玉米对低磷的耐受能力是多种生理反应综合作用的结果。

Abstract:Pot sand culture was set up for two inbred line maize with different phosphorus (P) efficiencies to investigate root physiological characteristics at seedling stage under P stress. When subject to low-P treatment, roots of low-P efficiency line 04065 have a significantly higher acid phosphatase (APase) activity during 4～8 leaf-stage and a lower P content than those of high-P efficiency line 04419. This indicates that root APase activity can be a suitable criterion for evaluating P efficiency of different maize inbred lines. With prolonged exposure to low-P stress (up to 6～8 leaf-stage), other physiological characteristics of maize roots, including root APase, root activity, MDA content, total root length and dry matter accumulation,except for root/shoot ratio, are significantly different between the two inbred lines. As such, tolerance of different maize genotypes to low-P stress is related to multiple physiological processes.

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