Particularity of water status and antioxidant complex - as markers of cross-tolerance in plants
2019
Ştefîrţă A. (Academy of Sciences of Moldova. Institute of Genetics, Phzsiology and Plant Protection), Brînză, L., Buceaceaia, S., Aluchi, N., Ionașcu, A.
Several studies have shown the existence of cross-tolerance in plants, but so far, the physiological mechanism of its manifestations is poorly understood. In this study, we examined the cross-tolerance of soybean plants to low and high temperature stresses induced by relative drought in the early stages of ontogenesis, and the possible involvement in its formation of the ability of water status self-regulation and antioxidant protection systems. The plants of two soybean varieties, with different potential for drought resistance, served as a subject of study. It has been demonstrated that exposure of plants to moderate hydric stress at the earliest stages of development induces resistance to hypo- and hyper- temperature stresses, as well as to repeated drought. It is argued that non-specific reactions, such as the ability to maintain water homeostasis in tissues and activate antioxidant protection systems, are involved in plant cross-tolerance formation. The obtained data showed that cross-tolerance may be the result of two distinct phenomena: as a consequence of previous plant exposure to another type of stress (inducible cross-tolerance) and / or as a genetic property specific to certain varieties, to demonstrate resistance to more stress types (inherent cross-resistance).
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