Genotypic variation in root morphology, cotton subtending leaf physiology and fiber quality against nitrogen

Journal of Cotton Research

Qiang DONG¹  Hengheng ZHANG¹  Nianchang PANG¹  Iqbal ASIF¹  Huiping GUI¹  Xiangru WANG²  Meizhen SONG³  Xiling ZHANG³ 

[1] State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, 455000, Anyang, China;State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, 455000, Anyang, China;Western Agricultural Research Center of Chinese Academy of Agricultural Sciences, 831100, Changji, Xinjiang, China;State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, 455000, Anyang, China;Western Agricultural Research Center of Chinese Academy of Agricultural Sciences, 831100, Changji, Xinjiang, China;School of Agricultural Sciences, Zhengzhou University, 450000, Zhengzhou, China;

关键词: Cotton;    Fiber quality;    Nitrogen;    Root morphology;    Subtending leaf;   

DOI  :  10.1186/s42397-021-00107-2

来源: Springer

【 摘 要 】

BackgroundNitrogen (N) is important for improving various morphological and physiological processes of cotton but their contribution to fiber quality is still lacking.AimsThe current study aimed to explore the relationship between root morphology, subtending leaf physiology, and fiber quality of contrasting N-efficient cotton genotypes in response to N.MethodsWe analyzed the above parameters of CCRI 69 (N-efficient) and Xinluzao-30 (XLZ-30, N-inefficient) under control (2.5 mmol·L−1) and high N (5 mmol·L−1) conditions.ResultsThe results showed that root morphological traits were increased in CCRI-69 under control conditions than high N. Subtending leaf morphology, chlorophyll and carotenoid contents, free amino acids, and soluble proteins were higher under high N as compared with the control. However, soluble sugars, fructose, sucrose contents, and sucrose phosphate synthase were higher under control conditions than high N across the growth stages. Irrespective of the N conditions, all morphological and physiological traits of cotton subtending leaf were higher in CCRI-69 than XLZ-30. Except for fiber uniformity, fiber quality traits like fiber length, strength, micronaire, and elongation were improved under control conditions than high N. Between the genotypes, CCRI-69 had significantly higher fiber length, strength, micronaire, and elongation as compared with XLZ-30. Strong positive correlations were found between root morphology, soluble sugars, sucrose content, and sucrose phosphate synthase activity with fiber quality traits, respectively.ConclusionsThese findings suggest that CCRI-69 performed better in terms of growth and fiber quality under relatively low N condition, which will help to reduce fertilizer use, the cost of production, and environmental pollution.

【 授权许可】

CC BY