Mechanisms of SMXL6, 7 and 8 proteins in Arabidopsis plant adaptation to drought

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We studied the functions of the strigolactone-signaling negative regulators SMXL6,7 and 8 in drought tolerance and the associated mechanisms by analyzing the drought-tolerant phenotype of the Arabidopsis thaliana triple smxl6,7,8 mutant plants and studied several drought tolerance-related traits. Our results together indicate that the SMXL6, 7 and 8 act as negative regulators of drought tolerance. The findings of this study suggest that disruption of these SMXL genes in crops may provide a novel way to improve their drought tolerance.Consistent with the results of the above study, strigolactone and karrikin receptors, DWARF14 (D14) and KARRIKIN INSENSITIVE 2 (KAI2), respectively, have been shown to positively regulate drought tolerance in Arabidopsis. We then aimed to identify genes specifically or commonly regulated by D14 and KAI2 under drought, using comparative analysis of the transcriptome data of the A. thaliana d14-1 and kai2-2 mutants under dehydration conditions. Results suggest that some genes involved in cytokinin and brassinosteroid metabolism might be specifically regulated by the D14 pathway, whereas some genes related to photosynthesis and metabolism of glucosinolates and trehalose are potentially regulated by both D14 and KAI2 pathways in plant response to dehydration.