Spermidine synthase genes from mulberry play an important role in drought stress tolerance by altering antioxidant enzymes and osmotic regulation
Dan Liu
A
B
Abstract
Our previous experiments confirmed that two mulberry spermidine synthase (SPDS) genes (MnSPDS1 and MnSPDS2) that encode functional proteins are highly expressed under drought stress. In this study, the functions of MnSPDS1/MnSPDS2 in the drought stress response were further explored by silencing and overexpressing these genes in mulberry and tobacco, respectively. Compared with the wild-type (WT) plants, the MnSPDS1/MnSPDS2-overexpression tobacco plants were more tolerant to drought stress and showed a higher spermidine content (P < 0.05). Moreover, overexpression of MnSPDS1/MnSPDS2 at the physiological level alleviated membrane damage caused by drought and improved osmotic regulation and antioxidant capacity. In addition, correlation analysis showed that the content of spermidine was positively correlated with the expression levels of MnSPDS1 and MnSPDS2, with correlation coefficients of 0.762 and 0.715, respectively. Moreover, drought injury was more serious in the MnSPDS-silenced seedlings than in the WT seedlings after drought treatment. These results suggest that MnSPDS genes play important roles in the drought stress response and are valuable for molecular breeding to enhance the drought tolerance of mulberry.
Keywords: drought stress, drought tolerance, gene expression, gene silencing, molecular breeding, mulberry, spermidine, spermidine synthase.
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