Aerenchyma Formed Under Phosphorus Deficiency Contributes to the Reduced Root Hydraulic Conductivity in Maize Roots
Aerenchyma Formed Under Phosphorus Deficiency Contributes to the Reduced Root Hydraulic Conductivity in Maize Roots作者机构：College of Agronomy Inner Mongolia Agricultural University Huhhot 010018 China Department of Biology Hong Kong Baptist University Hong Kong China
出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)
年 卷 期：2007年第49卷第5期
页 面：598-604页
核心收录：
基 金：Supported by the National Natural Science Foundation of China (30660086)
主 题：aerenchyma maize (Zea mays) phosphorus deficiency root root hydraulic conductivity.
摘 要：Root hydraulic conductivity has been shown to decrease under phosphorus （P） deficiency. This study Investigated how the formation of aerenchyma is related to this change. Root anatomy, as well as root hydraulic conductivity was studied In maize （Zea mays L.） roots under different phosphorus nutrition conditions. Plant roots under P stress showed enhanced degradation of cortical cells and the aerenchyma formation was associated with their reduced root hydraulic conductivity, supporting our hypothesis that air spaces that form in the cortex of phosphorusstressed roots Impede the radial transport of water in a root cylinder. Further evidence came from the variation In aerenchyma formation due to genotypic differences. Five maize inbred lines with different porosity in their root cortex showed a significant negative correlation with their root hydraulic conductivity. Shoot relative water content was also found lower In P-deficient maize plants than that in P-sufficient ones when such treatment was prolonged enough, suggesting a limitation of water transport due to lowered root hydraulic conductivity of P-deficient plants.
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