数字农科院2.0

Nitrogen uptake kinetics in relation to cotton root morphology subjected to different nitrogen sources

文献类型： 外文期刊

作者： Mahboob, Wajid;Sarwar, Nadeem;Irfan, Muhammad;Abbas, Muhammad;Akhtar, Muhammad;Yang, Guozheng;Zhang, Zhao

作者机构：

关键词： Cotton;Michaelis-Menten constant;nitrogen content;root morphological traits;total dry matter;uptake kinetics

期刊名称： JOURNAL OF PLANT NUTRITION

ISSN： 0190-4167

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Nitrogen (N) deficiency is considered one of the key factors limiting cotton growth and productivity. Kinetic and root morphological parameters influencing nutrient absorption efficiency are often overlooked in crop breeding programs. This hydroponic study examined the growth, morphology, and uptake kinetics parameters including maximum absorption velocity (Vmax), Michaelis-Menten constant (Km), minimum concentration (Cmin) for NO3- and NH4+ in cotton varieties, N-efficient Ghotki-Uhad (GH-Uhad) and N-inefficient Faisalabad-Hybrid (FH-444) subjected to 0.5 and 5 mM N supply. The studied parameters considerably responded to N application either in the form of NO3- or NH4+. High-N treatment significantly increased shoot dry weight (SDW) (46.7%), root dry weight (RDW) (28.3%), and total biomass (42.7%) compared to low-N and results were more obvious (16% higher biomass) under NO3--N than NH4+-N. Compared to NH4+-N, root length (RL) and root surface area (RSA) increased under low NO3--N while high NO3--N improved mean root diameter and root volume. Furthermore, GH-Uhad had low Km and Cmin for both N forms, suggesting that it functioned in a high-affinity transport system (HATS) under low N-supply. Contrarily, FH-444 exhibited higher Vmax for NH4+ but had low affinity irrespective of N forms. However, GH-Uhad preferred NO3- over NH4+, while FH-444 switched between the two at low and high N levels. Root morphological traits, Vmax, Cmin, and N content were positively associated with growth attributes while kinetic parameters had a negative correlation with root morphological traits. In crux, GH-Uhad performed better for growth, root morphology, and exhibited high affinity for N uptake, showing its adaptation to N-limited conditions.

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