文献类型： 外文期刊

作者： Chu, Qun ¹ ; Zhang, Lin ¹ ; Zhou, Jianwei ² ; Yuan, Lixing ¹ ; Chen, Fanjun ¹ ; Zhang, Fusuo ¹ ; Feng, Gu ¹ ; Rengel, Zed ³ ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Natl Acad Agr Green Dev, Beijing 100193, Peoples R China

2.Xinjiang Acad Agr & Reclamat Sci, Inst Irrigat & Soil Sci, Shihezi 832000, Peoples R China

3.Univ Western Australia, UWA Sch Agr & Environm, Soil Sci & Plant Nutr, Perth, WA 6009, Australia

关键词： Arbuscular mycorrhizal fungi; Breeding; Phosphorus acquisition efficiency; Maize genotypes; Mycorrhizal responsiveness; P-32 labeling

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期：

页码：

收录情况： SCI

摘要： Aims Arbuscular mycorrhizal fungi play important roles in plant phosphorus (P) accumulation. The aim of this study was to uncover how and to what extent soil plant-available P levels and maize genotypes influence the contribution of mycorrhizal P uptake pathway to plant P nutrition. Methods We selected an old genotype HMY and a modern genotype XY335, combined with P-32 labeling and qPCR to quantify P uptake efficiency of the direct pathway (DP) and the mycorrhizal pathway (MP) at three Olsen-P levels: 4.5 (low), 8 (medium) and 50 (high) mg kg(-1). Results The P uptake efficiency ratio PAE-MP/PAE-DP was highest in the treatment with medium Olsen-P, and was correlated positively with MP contribution. The traits of arbuscular mycorrhizal fungi, such as percent colonization, hyphal length density, P uptake per unit hyphae length, and the expression of the mycorrhiza-specific P transporter ZmPT1;6 were higher in XY335 than HMY in high-P soil, which was in accordance with the importance of the MP contribution. Conclusions Greater mycorrhizal responsiveness in the modern maize genotype than the old genotype under high P soil condition is related to higher P uptake efficiency of MP than DP; the inherent potential of MP can be maximized by managing soil plant P availability to achieve optimal P supply in intensive farming.