Phosphorus efficiency and root exudates in two contrasting tropical maize varieties
Phosphorus efficiency and root exudates in two contrasting tropical maize varieties
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DOI：
10.1080/15226510701375085
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发表时间：
2007-01-01
影响因子：
2.1
通讯作者：
Barcelo, Juan
中科院分区：
文献类型：
--
作者：
Corrales, Isabel;Amenos, Montserrat;Barcelo, Juan
采用营养液培养和石英砂改良法，比较了两个对照玉米杂交种L3 x228 -3（磷高效）和HS 2841 x5046（磷低效）对缺磷的短期反应。在溶液中生长的幼苗，快速缺磷诱导增强根的生长和根/冠比是一个标志的缺磷胁迫，而不是磷效率。沙培条件下，磷高效玉米对难溶性磷矿粉中磷的吸收高于磷低效玉米。在品种L3-228-3中，磷效率似乎是由于增强磷的收购，而不是增强磷的利用效率。在砂培中，磷高效玉米根际柠檬酸盐浓度高于磷低效玉米，而在溶液培养中则不然。在短期试验中，用石英砂配施磷矿粉比营养液更能揭示磷素吸收效率的品种差异。
Nutrient solution culture and quartz sand amended with or without rock phosphate, were used to compare the short-term responses to phosphorus (P) deficiency of two contrasting maize hybrids, L3x228-3 (P-efficient) and HS 2841x5046 (P-inefficient). In solution-grown seedlings, the rapid P deficiency-induced enhancement of root growth and of the root/shoot ratio was a sign of P deficiency stress rather than of P efficiency. In sand culture, uptake of P from sparingly soluble rock phosphate was higher in P-efficient plants than in P-inefficient maize. In the variety L3-228-3, P efficiency seemed due to enhanced P acquisition rather than to an enhanced P use efficiency. In sand, but not in solution culture, higher citrate concentrations were detected in the rhizosphere of P-efficient than of P-inefficient maize. Quartz sand amended with rock phosphate was a better substrate than nutrient solution for revealing the varietal differences in P acquisition efficiency in short-term experiments.