Department of Seed Science and Technology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Department of Agronomy, Khulna Agricultural University, Khulna, 9100, Bangladesh.
Plant Cell Rep. 2021 Aug;40(8):1451-1469. doi: 10.1007/s00299-021-02690-9. Epub 2021 Apr 10.
5-aminolevulinic acid (ALA) modulates various defense systems in plants and confers abiotic stress tolerance. Enhancement of crop production is a challenge due to numerous abiotic stresses such as, salinity, drought, temperature, heavy metals, and UV. Plants often face one or more abiotic stresses in their life cycle because of the challenging growing environment which results in reduction of growth and yield. Diverse studies have been conducted to discern suitable mitigation strategies to enhance crop production by minimizing abiotic stress. Exogenous application of different plant growth regulators is a well-renowned approach to ameliorate adverse effects of abiotic stresses on crop plants. Among the numerous plant growth regulators, 5-aminolevulinic acid (ALA) is a novel plant growth regulator, also well-known to alleviate the injurious effects of abiotic stresses in plants. ALA enhances abiotic stress tolerance as well as growth and yield by regulating photosynthetic and antioxidant machineries and nutrient uptake in plants. However, the regulatory roles of ALA in plants under different stresses have not been studied and assembled systematically. Also, ALA-mediated abiotic stress tolerance mechanisms have not been fully elucidated yet. Therefore, this review discusses the role of ALA in crop growth enhancement as well as its ameliorative role in abiotic stress mitigation and also discusses the ALA-mediated abiotic stress tolerance mechanisms and its limitation and future promises for sustainable crop production.
5-氨基乙酰丙酸（ALA）调节植物的各种防御系统，并赋予其抗非生物胁迫的能力。由于盐度、干旱、温度、重金属和紫外线等多种非生物胁迫，作物的产量提升面临挑战。由于具有挑战性的生长环境，植物在其生命周期中经常面临一种或多种非生物胁迫，这导致其生长和产量减少。为了通过最小化非生物胁迫来提高作物产量，已经进行了各种研究以确定合适的缓解策略。外源施用不同的植物生长调节剂是一种著名的方法，可减轻非生物胁迫对作物的不利影响。在众多的植物生长调节剂中，5-氨基乙酰丙酸（ALA）是一种新型的植物生长调节剂，也被证明可以减轻植物中非生物胁迫的伤害。ALA 通过调节光合作用和抗氧化机制以及植物对养分的吸收，增强植物的非生物胁迫耐受性以及生长和产量。然而，ALA 在不同胁迫下对植物的调节作用尚未得到系统研究和综合。此外，ALA 介导的非生物胁迫耐受机制尚未完全阐明。因此，本综述讨论了 ALA 在作物生长促进中的作用及其在减轻非生物胁迫方面的缓解作用，还讨论了 ALA 介导的非生物胁迫耐受机制及其局限性和未来在可持续作物生产中的前景。
