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- Title
Genotypic differences in phosphorus acquisition efficiency and root performance of cotton (Gossypium hirsutum) under low-phosphorus stress.
- Authors
Chen, Bolang; Wang, Qinghui; Bücking, Heike; Sheng, Jiandong; Luo, Jia; Chai, Zhongping; Kafle, Arjun; Hou, Yinying; Feng, Gu
- Abstract
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. Significant genotypic variation in P-acquisition efficiency (PAE) was existed among the cotton genotypes. P-efficient genotypes demonstrated great tolerance to P deficiency. Root morphology, especially surface fine root length and middle root length, played an important role in P uptake under P-limited conditions.
- Subjects
PHOSPHORUS in agriculture; COTTON genetics; PLANT root morphology
- Publication
Crop & Pasture Science, 2019, Vol 70, Issue 4, p344
- ISSN
1836-0947
- Publication type
Article
- DOI
10.1071/CP18324