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磷高效基因型小麦对缺磷胁迫的根际适应性反应
引用本文:王庆仁,李振声.磷高效基因型小麦对缺磷胁迫的根际适应性反应[J].西北植物学报,2000,20(1):1-7.
作者姓名:王庆仁  李振声
作者单位:1. 中国科学院生态环境研究中心,北京 100085
2. 中国科学院遗传研究所,北京 100101
基金项目:国家自然科学基金!重大项目(挖掘生物高效利用土壤养分潜力, 保持土壤环境良性循环)资助(39790100)
摘    要:采用奶箱分隔栽培试验法,进行了磷高效与磷低效小麦基因型根际土壤PH与有效磷变化的研究,结果表明:小麦根际土壤PH和有效磷含量皆明显低于外围土壤,表现出明显的根际效应特征;磷高效基因型小麦的根际PH和有效磷含量明显低于磷低效基因型,PH变异范围和磷素亏缺区也表现明显较大。为了进一步验证磷高效小麦基因型这的这一根际特征,同时进行了施用水溶性,枸溶性磷肥的试验研究,结果表明,以水溶性磷肥对根际PH和有效

关 键 词:小麦基因型  磷效率  磷胁迫  根际PH  土壤有效磷
文章编号:1000-4025-(2000)01-0001-07
修稿时间:1999年2月6日

Adapted responses in the rhizosphere of P efficient wheat genotype to stress of phosphorus deficiency
WANG Qing ren,LI Ji yun,LI Zheng sheng.Adapted responses in the rhizosphere of P efficient wheat genotype to stress of phosphorus deficiency[J].Acta Botanica Boreali-Occidentalia Sinica,2000,20(1):1-7.
Authors:WANG Qing ren  LI Ji yun  LI Zheng sheng
Abstract:With a newly developed rhizobox system,studies on changes of pH and available phosphorus (P) in the rhizophere of P efficient wheat genotype were carried out.The results indicated that pH value and available P in the rhizosphere were much lower than that in the bulk soil.pH values and contents of available P for efficient genotype were much lower than that for inefficient one.The similar results appeared as above when P fertilizers supplied but water soluble phosphate had more impact on pH values and available P in the rhizosphere than citvate soluble phosphate.This has been proved that P efficient genotype of wheat possess some special mechanism to utilize soil unavailable P or citrate soluble phosphate in calcareous soil efficiently through some changes of rhizosphere effect.Simultaneously,it has been demonstrated that pH reduction in the rhizosphere is one of the root induced mechanisms of P efficient wheat genotype for the stress of P deficiency,which results in mobilization and efficiently uptake of P from calcareous soil.
Keywords:wheat genotypes  phosphorus efficiency  rhizosphere  available phosphorus  pH
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