Choudhary Pooja, Aggarwal Pooja R, Salvi Praful, Muthamilarasan Mehanathan
Department of Biotechnology, Jaypee Institute of Information Technology, Noida, 201309, Uttar Pradesh, India.
Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, 500046, Telangana, India.
Plant Physiol Biochem. 2025 Feb;219:109452. doi: 10.1016/j.plaphy.2024.109452. Epub 2024 Dec 24.
Phytohormones are vital regulators of various signaling networks in plants. Among different phytohormones, auxin has been thoroughly studied for its role in regulating plants' growth, development, and stress response. One major function of auxin is modulating the developmental processes in response to environmental cues. Although extensive studies on Arabidopsis have advanced the knowledge of auxin biology, several studies on rice have uncovered key players regulated by auxin that play critical roles in coordinating auxin homeostasis and signaling involved in defense response. The emerging knowledge on auxin biology, auxin-regulated gene expression, and auxin-signaling in rice during various environmental stresses has provided insights into the possible mechanism of rice susceptibility or resistance to different abiotic and biotic stresses. The current review enumerates the possible mechanisms of stress-induced auxin homeostasis in rice. In addition, we provide an overview of the state of knowledge on auxin-mediated defense signaling in rice, highlighting its pivotal role in stress response. In particular, we discuss the auxin pathways and the dynamic regulation in response to biotic and abiotic stress. We highlight the novel findings in the diversity of auxin signaling in the model plant Arabidopsis with an aim to emphasize the need to translate these findings into agronomically and economically important cereals like rice. Addressing the complexity of auxin induction, signaling, and its associated molecular network, an in-depth investigation in rice is required to comprehend auxin-mediated spatial-temporal regulation of developmental processes during stress.
植物激素是植物各种信号网络的重要调节因子。在不同的植物激素中，生长素因其在调节植物生长、发育和应激反应中的作用而得到了深入研究。生长素的一个主要功能是响应环境信号调节发育过程。尽管对拟南芥的广泛研究推动了生长素生物学知识的进步，但一些关于水稻的研究发现了受生长素调节的关键因子，这些因子在协调生长素稳态和参与防御反应的信号传导中发挥着关键作用。关于水稻在各种环境胁迫下生长素生物学、生长素调节的基因表达和生长素信号传导的新知识，为了解水稻对不同非生物和生物胁迫的易感性或抗性的可能机制提供了见解。本综述列举了水稻中胁迫诱导的生长素稳态的可能机制。此外，我们概述了水稻中生长素介导的防御信号传导的知识状态，强调了其在应激反应中的关键作用。特别是，我们讨论了生长素途径以及对生物和非生物胁迫的动态调节。我们强调了模式植物拟南芥中生长素信号传导多样性的新发现，旨在强调将这些发现转化为像水稻这样在农业和经济上重要的谷物的必要性。鉴于生长素诱导、信号传导及其相关分子网络的复杂性，需要对水稻进行深入研究，以了解应激期间生长素介导的发育过程的时空调节。
