Low nitrate alleviates iron deficiency by regulating iron homeostasis in apple

文献类型： 外文期刊

第一作者： Sun, Wei-Jian

作者： Sun, Wei-Jian;Zhang, Jiu-Cheng;Ji, Xing-Long;Feng, Zi-Quan;Wang, Xun;You, Chun-Xiang;Wang, Xiao-Fei;Hao, Yu-Jin;Sun, Wei-Jian;Huang, Wen-Jing

作者机构：

关键词： abscisic acid; citric acid

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.362； 五年影响因子：7.044 ）

ISSN： 0140-7791

年卷期： 2021 年 44 卷 6 期

页码：

收录情况： SCI

摘要： Iron (Fe) is an essential element for plant growth, development and metabolism. Due to its lack of solubility and low bioavailability in soil, Fe levels are usually far below the optimum amount for most plants' growth and development. In apple production, excessive use of nitrogen fertilizer may cause iron chlorosis symptoms in the newly growing leaves, but the regulatory mechanisms underlying this phenomenon are unclear. In this study, low nitrate (NO3-, LN) application alleviated the symptoms of Fe deficiency and promoted lower rhizosphere pH, which was beneficial for root Fe acquisition. At the same time, LN treatment increased citrate and abscisic acid accumulation in roots, which promoted Fe transport from root to shoot and maintained Fe homeostasis. Moreover, qRT-PCR analysis showed that nitrate application caused differential expression of genes related to Fe uptake and transport, as well as transcriptional regulators. In summary, our data reveal that low nitrate alleviated Fe deficiency through multiple pathways, demonstrating a new option for minimizing Fe deficiency by regulating the balance between nutrients.

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