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首页> 外文期刊>Plant and Soil >Genotypic variability in phosphorus solubilizing activity of root exudates by pigeonpea grown in low-nutrient environments
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Genotypic variability in phosphorus solubilizing activity of root exudates by pigeonpea grown in low-nutrient environments

机译：低营养环境下木豆根系分泌物对磷的增溶活性的基因型变异

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A pot experiment confirmed that pigeonpea could efficiently utilize various sources of phosphorus (P) (aluminium phosphate, iron phosphate and apatite), irrespective of genotype. A qualitative assay method for iron (Fe)-P solubilizing activity showed that root exudates collected from P-deficient pigeonpea contained Fe-P solubilizing substances and that they were released mainly from root tips. Citric, malic, malonic, succinic and piscidic acids were identified in root exudates. Citric and piscidic acids release from roots was increased by low-P treatment in all the genotypes tested. The release rates of citric and piscidic acids were affected by the P concentration of shoots rather than that of roots. The pigeonpea roots released approximately 5–100 times more piscidic acid than citric acid depending on P stress status, plant age and genotype. When organic acids were added to Alfisols, citric acid was most capable of mobilizing P from the soil, followed by piscidic acid and malic acid. No correlation was found between genotypic variability in the release rates of citric and piscidic acids from the roots under low-P treatment at hydroponic culture and in the growth and P uptake of plants on Alfisols. Although citric and piscidic acids released from pigeonpea roots may play a partial role in solubilizing unavailable insoluble P in soils, the releases were thought to be an unsatisfactory strategy for explaining genotypic variation in low P availability of pigeonpea.
机译：盆栽实验证实，木豆可以有效利用各种磷源（磷酸铝，磷酸铁和磷灰石），而与基因型无关。铁（Fe）-P增溶活性的定性测定方法表明，从缺磷的木豆中收集的根系分泌物含有Fe-P增溶物质，并且它们主要从根尖释放。在根分泌物中鉴定出柠檬酸，苹果酸，丙二酸，琥珀酸和二十二碳六烯酸。在所有测试的基因型中，低磷处理均增加了从根中释放的柠檬酸和二十碳二烯酸。柠檬酸和二十碳二烯酸的释放速率受芽中磷含量的影响，而不是根系中磷的含量。木豆根释放的二十二碳二烯酸比柠檬酸多约5–100倍，具体取决于P胁迫状态，植物年龄和基因型。当将有机酸添加到Alfisols中时，柠檬酸最有能力从土壤中迁移磷，其次是二十二碳六烯酸和苹果酸。在水培条件下低磷处理下，柠檬酸和二十二碳酸从根部释放速率的基因型变异与植物生长和磷吸收之间没有相关性。尽管从木豆根中释放的柠檬酸和二十碳二烯酸可能在溶解土壤中不可利用的不溶性磷中起部分作用，但这些释放被认为是解释低磷可利用性中的基因型变异的令人满意的策略。

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