Exploring genotypic variations in cotton associated with growth and nitrogen use efficiency

文献类型： 外文期刊

第一作者： Mahboob, Wajid

作者： Mahboob, Wajid;Yang, Guozheng;Sarwar, Nadeem;Hafeez, Osama Bin Abdul;Arif, Mian Abdur Rehman;Akhtar, Muhammad

作者机构：

关键词： Chlorophyll; nitrogen utilization efficiency; photosynthetic N use efficiency; photosynthetic rate; stomatal conductance; total dry matter

期刊名称：JOURNAL OF PLANT NUTRITION （ 影响因子：1.6； 五年影响因子：2.4 ）

ISSN： 0190-4167

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Low nitrogen (N) is a major limitation of cotton sustainability and productivity. N-efficient genotype cultivation can enhance productivity under the economical N usage. This study was conducted to characterize 15 cotton genotypes for N use efficiency (NUE) under differential N (0.0125 and 0.125 g kg-1 of sand) supply. All studied traits significantly responded to genotypes and N treatments. Under low N conditions, plants experienced reduced seedling height, root weight, shoot weight and total biomass (TDM) production, chlorophyll content, photosynthetic efficiency, NPK content, and N uptake efficiency (NUpE). Thus, intercellular CO2 concentration, photosynthetic N use efficiency (PNUE), and NUtE enhanced in low N supply, although these changes varied in magnitude. Based on variations in TDM production (14.6-33.1%) and NUtE (3.3-20.4%), GH-Uhad, FH-Anmol, FH-Super, GH-Haadi, and SLH-Chandani were categorized as efficient and responsive (ER), while J-7, CIM-343, FH-155, FH-492, FH-444 found as inefficient and non-responsive. The efficient and non-responsive group contained FH-142, GH-Baghdadi, and FH-490 whereas FH-152 and Cyto-179 were classified as inefficient and responsive. The scoring method provided further insight into genotypic NUE related to biomass distribution, photosynthetic rate (Pn), NUpE, and NUtE under low N. The highest cumulative score (15-18) of ER genotypes for these attributes indicated selected traits orchestrated to determine the NUE. Moreover, agronomical and NUE-related traits were positively associated with Pn, suggesting that photosynthesis is a primary manipulator of plant growth which coordinates biomass production and NUE. Overall, cultivars exhibited greater genotypic variation for NUE, providing a scientific basis to evaluate the existing germplasm and proposing that cultivation of N-efficient genotypes can decrease N application and help cotton breeding for sustainable production.

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