Fine Root Patterning and Balanced Inorganic Phosphorus Distribution in the Soil Indicate Distinctive Adaptation of Maize Plants to Phosphorus Deficiency  

作　　者：ZHANG Yu YU Peng PENG Yun-Feng LI Xue-Xiun CHEN Fan-Jun LI Chun-Jian 

机构地区：[1]Key Laboratory of Plant-Soil Interactions,Ministry of Education,Department of Plant Nutrition,China Agricultural University,Beijing 100193(China)

出　　处：《Pedosphere》2012年第6期870-877,共8页土壤圈（英文版）

基　　金：Supported by the National Basic Research Program (973 Program) of China (No. 2013CB127402);the Fundamental Research Funds for the Central Universities, China (No. 2012YJ054);the Innovative Research Group Grant of the National Natural Science Foundation of China (No. 31121062)

摘　　要：Plants have diverse strategies to cope with phosphorus （P） deficiency. To better understand how maize responds to P deficiency, a field experiment with two P levels, 0 and 100 kg P205 ha-1 （P0 and P100, respectively）, was carried out as a part of a long-term Pfertilizer field trial. Plant and soil analyses showed that P-deficient maize reduced its growth rate, increased P use efficiency, and formed more thin roots with the diameter less than 0.6 mm at jointing and silking stages, compared to the plants treated with P100. Further, there were no differences in major inorganic P fractions （Ca2-P, Cas-P, Al-P, Fe-P, occluded P and Ca10-P） between the rhizospheric and bulk soils at each harvest, even when soil Olsen-P was only 1.38 mg kg-1. These results suggested that maize responded to P deficiency by reducing the internal P demand for growth and increasing P acquisition ability by favorable root morphological alteration at low carbon cost.Plants have diverse strategies to cope with phosphorus (P) deficiency. To better understand how maize responds to P deficiency, a field experiment with two P levels, 0 and 100 kg P2O5 ha-1 (P0 and P100, respectively), was carried out as a part of a long-term Pfertilizer field trial. Plant and soil analyses showed that P-deficient maize reduced its growth rate, increased P use efficiency, and formed more thin roots with the diameter less than 0.6 mm at jointing and silking stages, compared to the plants treated with P100. Further, there were no differences in major inorganic P fractions (Ca 2 -P, Ca 8 -P, Al-P, Fe-P, occluded P and Ca 10 -P) between the rhizospheric and bulk soils at each harvest, even when soil Olsen-P was only 1.38 mg kg-1 . These results suggested that maize responded to P deficiency by reducing the internal P demand for growth and increasing P acquisition ability by favorable root morphological alteration at low carbon cost.

关 键 词：inorganic phosphorus fractions phosphorus starvation RHIZOSPHERE root length root morphology 

分 类 号：S565.106[农业科学—作物学] S513