Heat stress increases plant transpiration and photosynthesis rates, alters cell membrane structure and causes protein denaturation and enzyme inactivation (Wahid et al. Water deficit causes stomatal closure to prevent water loss by transpiration subsequently, CO 2 intake is reduced impairing photosynthesis, which, in turn, unbalances electron transport chain and causes oxidative stress (Pinheiro and Chaves 2011 Vincent et al. Among them, drought and high temperatures are important stress factors for agriculture areas worldwide (Li et al. Wild and cultivated plants are affected by environmental changes that are detrimental to their development and can reduce agriculture production. Taken together, our findings indicate that the activation of the antioxidant system under stress combination is a transmissible trait from the rootstock to the scion and highlight the importance of the rootstock selection to improve crop performance and maintain citrus yield under the current scenario of climate change. On the contrary, Cleopatra rootstock induced decreases in APX2 expression, CAT activity and SOD1, APX2 and CAT contents on Carrizo scion. Carrizo rootstock, under stress combination, positively influenced Cleopatra scion by reducing H 2O 2 accumulation, increasing superoxide dismutase (SOD) and ascorbate peroxidase (APX) enzymatic activities and inducing SOD1, APX2 and catalase (CAT) protein accumulations. Here, by using reciprocal grafts of both genotypes, we studied the importance of the rootstock on scion performance and antioxidant response under this stress combination. reshni) to drought and heat stress combination, in part, due to a higher activation of the antioxidant system that alleviated damage produced by oxidative stress. Previously, our research demonstrated that the citrus rootstock Carrizo citrange ( Citrus sinensis × Poncirus trifoliata) is more tolerant than Cleopatra mandarin ( C. Rising temperatures, especially in certain regions, accelerates soil water depletion and increases drought risk, which affects agriculture yield. AbstractĬlimate change is altering weather conditions such as mean temperatures and precipitation patterns. Therefore, rootstock selection is key to improve crop performance and a sustainable production under changing climate conditions. The activation of the antioxidant system under stress combination is a transmissible trait from the rootstock to the scion.
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