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Genotypic differences in phosphorus acquisition efficiency and root performance of cotton (Gossypium hirsutum) under low-phosphorus stress

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文献类型：外文期刊

作者： Chen, Bolang ¹ ; Wang, Qinghui ² ; Buecking, Heike ³ ; Sheng, Jiandong ¹ ; Luo, Jia ¹ ; Chai, Zhongping ¹ ; Kafle, Arj ¹ ;

作者机构： 1.Xinjiang Agr Univ, Xinjiang Key Lab Soil & Plant Ecol Proc, Coll Grassland & Environm Sci, Urumqi 830052, Xinjiang, Peoples R China

2.Xinjiang Acad Agr Sci, Agr Mechanisat Inst, Urumqi 830091, Xinjiang, Peoples R China

3.South Dakota State Univ, Biol & Microbiol Dept, Brookings, SD 57007 USA

4.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

关键词： acid phosphatase; biomass partitioning; harvest index; principle component analysis

期刊名称：CROP & PASTURE SCIENCE （影响因子：2.286；五年影响因子：2.507 ）

ISSN： 1836-0947

年卷期： 2019 年 70 卷 4 期

页码：

收录情况： SCI

摘要： Low availability of phosphorus (P) is a major constraint to production of cotton (Gossypium hirsutum L.). The extent to which genotypic variation in root traits exists or contributes to P-acquisition efficiency (PAE) in cotton is unknown. To assess genetic variation in PAE, the biomass and P-acquisition characteristics of 32 cotton genotypes were evaluated in a hydroponic experiment. Significant genotypic variation in biomass and P content was detected among the cotton genotypes in two seasons. We then conducted a 2-year pot experiment to compare P-efficiency traits between three P-efficient and two P-inefficient genotypes under P-deficient and P-sufficient conditions (0 and 75 mg P2O5 kg(-1) soil, respectively). We detected significant differences in biomass accumulation and allocation, P accumulation and allocation, root traits and PAE among the five cotton genotypes under P-sufficient and P-deficient conditions. Compared with P-inefficient genotypes, P-efficient genotypes had longer surface fine roots, and greater total root surface area, total root length, surface root length, and P concentration (partitioning index) in bolls. Root morphology, especially surface fine root length and middle root length, played an important role in P uptake under P-deficient conditions.

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