Heat or cold priming-induced cross-tolerance to abiotic stresses in plants: key regulators and possible mechanisms

Abstract

Plants growing under field conditions are constantly exposed, either simultaneously or sequentially, to more than one abiotic stress factor. Plants have evolved sophisticated sensory systems to perceive a number of stress signals that allow them to activate the most adequate response to grow and survive in a given environment. Recently, cross-stress tolerance (i.e. tolerance to a second, strong stress after a different type of mild primary stress) has gained attention as a potential means of producing stress-resistant crops to aid with global food security. Heat or cold priming-induced cross-tolerance is very common in plants and often results from the synergistic co-activation of multiple stress signalling pathways, which involve reactive nitrogen species (RNS), reactive oxygen species (ROS), reactive carbonyl species (RCS), plant hormones and transcription factors. Recent studies have shown that the signalling functions of ROS, RNS and RCS, most particularly hydrogen peroxide, nitric oxide (NO) and methylglyoxal (MG), provide resistance to abiotic stresses and underpin cross-stress tolerance in plants by modulating the expression of genes as well as the post-translational modification of proteins. The current review highlights the key regulators and mechanisms underlying heat or cold priming-induced cross-stress tolerance in plants, with a focus on ROS, MG and NO signalling, as well as on the role of antioxidant and glyoxalase systems, osmolytes, heat-shock proteins (HSPs) and hormones. Our aim is also to provide a comprehensive idea on the topic for researchers using heat or cold priming-induced cross-tolerance as a mechanism to improve crop yields under multiple abiotic stresses.

Heat Acclimation and Inhibition of Cytokinin Degradation Positively Affect Heat Stress Tolerance of Arabidopsis

“…Heat stress tolerance can be substantially enhanced by plant pre-treatment with moderately elevated temperature (i.e., heat acclimation; Sung et al, 2003;Hossain et al, 2018;Ling et al, 2018). The primary aim of the present study was to identify hormonal changes associated with increased stress tolerance and effective recovery.…”

Transcription factor genes involved in plant response to abiotic stress factors

“…Растения развили способность адаптироваться к суровым условиям окружающей среды, причем в природе чаще всего наблюдается комплексное воздействие стрессовых факторов. Растения, пережившие один абио тический стресс, часто оказываются более приспособленными ко второму стрессу [106,107]. Более того, растения, способные успешно сопротивляться нескольким стрессам, имеют эволюционное преимущество по отношению к растениям, устойчивым к отдельным факторам среды [108].…”

Physiological, Proteomic, and Biochemical analysis Reveal Possible Cross-Tolerance in metabolism and heat response proteins in response to Heat and Water Stress in Soybean

“…The control treatments consisted of 28/20°C and WW. The WS was imposed gradually as follows: no irrigation (30)(31), watered 40% of the control (32)(33)(34)(35)(36)(37)(38)(39), and no irrigation (40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50). The high temperature, (38/30°) and drought stress at optimum and high temperatures were imposed by withholding irrigation until the soil water content reached 96% (-30 M Pa) of the control (-1.5 M Pa).…”

“…As plants undergo a combination of multiple stresses in the field condition, they trigger defense mechanisms and cooperative systems, which under multiple stresses display cross-tolerance with each other to increase the plants' immune efficiency (31). Cross-tolerance is a phenomenon in plants that makes them become more tolerant to second stress after imposing under first stress, such as induction of stress memory after the stress (32).…”

“…None of the proteins fall under the category of Cluster III in PI cultivar. Cluster IV includes 12 proteins (#1,8,11,16,18,25,28,31,32,33,35,36) exhibiting mixed responses to each stress type/s, with the majority of them were involved in Among these, sixteen proteins showed reduction in abundance to two or more stresses, majorly involved in response to heat. ten proteins showed reduction in abundance to all three stresses.…”