对非生物胁迫下植物氮吸收和新陈代谢的生理、分子和环境研究。

IF 3.9 2区 生物学 Q1 GENETICS & HEREDITY
Plant Genome Pub Date : 2024-06-01 Epub Date: 2024-05-26 DOI:10.1002/tpg2.20461
Kashif Akhtar, Noor Ul Ain, P V Vara Prasad, Misbah Naz, Mehtab Muhammad Aslam, Ivica Djalovic, Muhammad Riaz, Shakeel Ahmad, Rajeev K Varshney, Bing He, Ronghui Wen
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引用次数: 0

摘要

氮(N)作为一种无机宏量营养元素,对于植物的生长、发育和生物量生产来说是不可或缺的。许多外部因素和压力,如酸度、碱度、盐度、温度、氧气和降雨量,都会影响植物对氮的吸收和代谢。植物对铵(NH4 +)和硝酸盐(NO3 -)的吸收主要取决于土壤性质。在 NO3 - 供应充足的情况下(>1 mM),低亲和力转运系统会被基因网络 NRT1 激活,而在 NO3 - 供应不足的情况下(4 + 离子是细胞通过关键酶谷氨酰胺合成酶和谷氨酸合成酶介导的最终氮同化形式),低亲和力转运系统会被基因网络 NRT1 激活。WRKY1 是植物氮调节网络中的一个主要转录因子。然而,转录组和代谢物图谱显示,在非生物胁迫下,包括甘氨酸、谷氨酰胺和天门冬氨酸在内的氮同化代谢物会发生变化。过量表达 NO3 转运体(OsNRT2.3a 和 OsNRT1.1b)可显著提高各种作物的生物量和产量。在不利的温度、干旱、盐度、重金属和养分胁迫等具有挑战性的土壤和环境条件下,改变基因的表达水平可能是改善氮代谢的重要工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physiological, molecular, and environmental insights into plant nitrogen uptake, and metabolism under abiotic stresses.

Nitrogen (N) as an inorganic macronutrient is inevitable for plant growth, development, and biomass production. Many external factors and stresses, such as acidity, alkalinity, salinity, temperature, oxygen, and rainfall, affect N uptake and metabolism in plants. The uptake of ammonium (NH4 +) and nitrate (NO3 -) in plants mainly depends on soil properties. Under the sufficient availability of NO3 - (>1 mM), low-affinity transport system is activated by gene network NRT1, and under low NO3 - availability (<1 mM), high-affinity transport system starts functioning encoded by NRT2 family of genes. Further, under limited N supply due to edaphic and climatic factors, higher expression of the AtNRT2.4 and AtNRT2.5T genes of the NRT2 family occur and are considered as N remobilizing genes. The NH4 + ion is the final form of N assimilated by cells mediated through the key enzymes glutamine synthetase and glutamate synthase. The WRKY1 is a major transcription factor of the N regulation network in plants. However, the transcriptome and metabolite profiles show variations in N assimilation metabolites, including glycine, glutamine, and aspartate, under abiotic stresses. The overexpression of NO3 - transporters (OsNRT2.3a and OsNRT1.1b) can significantly improve the biomass and yield of various crops. Altering the expression levels of genes could be a valuable tool to improve N metabolism under the challenging conditions of soil and environment, such as unfavorable temperature, drought, salinity, heavy metals, and nutrient stress.

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来源期刊
Plant Genome
Plant Genome PLANT SCIENCES-GENETICS & HEREDITY
CiteScore
6.00
自引率
4.80%
发文量
93
审稿时长
>12 weeks
期刊介绍: The Plant Genome publishes original research investigating all aspects of plant genomics. Technical breakthroughs reporting improvements in the efficiency and speed of acquiring and interpreting plant genomics data are welcome. The editorial board gives preference to novel reports that use innovative genomic applications that advance our understanding of plant biology that may have applications to crop improvement. The journal also publishes invited review articles and perspectives that offer insight and commentary on recent advances in genomics and their potential for agronomic improvement.
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