Bielach Agnieszka, Hrtyan Monika, Tognetti Vanesa B
Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, Czech 62500, Brno, Czech Republic.
Int J Mol Sci. 2017 Jul 4;18(7):1427. doi: 10.3390/ijms18071427.
Plant growth and development are critically influenced by unpredictable abiotic factors. To survive fluctuating changes in their environments, plants have had to develop robust adaptive mechanisms. The dynamic and complementary actions of the auxin and cytokinin pathways regulate a plethora of developmental processes, and their ability to crosstalk makes them ideal candidates for mediating stress-adaptation responses. Other crucial signaling molecules responsible for the tremendous plasticity observed in plant morphology and in response to abiotic stress are reactive oxygen species (ROS). Proper temporal and spatial distribution of ROS and hormone gradients is crucial for plant survival in response to unfavorable environments. In this regard, the convergence of ROS with phytohormone pathways acts as an integrator of external and developmental signals into systemic responses organized to adapt plants to their environments. Auxin and cytokinin signaling pathways have been studied extensively. Nevertheless, we do not yet understand the impact on plant stress tolerance of the sophisticated crosstalk between the two hormones. Here, we review current knowledge on the function of auxin and cytokinin in redirecting growth induced by abiotic stress in order to deduce their potential points of crosstalk.
植物的生长和发育受到不可预测的非生物因素的严重影响。为了在环境的波动变化中生存，植物不得不发展出强大的适应机制。生长素和细胞分裂素途径的动态互补作用调节着众多发育过程，它们的相互作用能力使其成为介导应激适应反应的理想候选者。负责植物形态和对非生物胁迫响应中观察到的巨大可塑性的其他关键信号分子是活性氧（ROS）。ROS和激素梯度在时间和空间上的适当分布对于植物在不利环境中的生存至关重要。在这方面，ROS与植物激素途径的交汇将外部和发育信号整合为系统性反应，使植物能够适应环境。生长素和细胞分裂素信号通路已得到广泛研究。然而，我们尚未了解这两种激素之间复杂的相互作用对植物胁迫耐受性的影响。在此，我们综述了目前关于生长素和细胞分裂素在重定向非生物胁迫诱导的生长中的功能的知识，以推断它们潜在的相互作用点。
