Biologia plantarum 64: 406-416, 2020 | DOI: 10.32615/bp.2020.017

Mannose regulates water balance, leaf senescence, and genes related to stress tolerance in white clover under osmotic stress

S.Y. ZHAO, W.H. ZENG, Z. LI*, Y. PENG
Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 61130, P.R. China

Mannose (MAN), an important monosaccharide, contributes to coping with abiotic stresses in plants. Objectives of this study were to examine whether exogenous MAN (30 mM) could significantly increase drought tolerance and further to reveal MAN-regulated tolerance mechanism in white clover under osmotic stress induced by 18 % (m/v) polyethylene glycol 6000 for 10 d in controlled growth chambers. Results show that the application of MAN significanlty alleviated stress damage and the inhibition of growth and photosynthesis in white clover under osmotic stress. The MAN-induced increase in endogenous MAN content and the accumulation of organic osmolytes (proline and water soluble sugars) could be responsible for a lower osmotic potential (OP) in white clover. The exogenous application of MAN also enhanced antioxidant enzyme (superoxide dismutase, peroxidase, ascorbate peroxidase, dehydroascorbate reductase, and glutathione reductase) activities and maintained ascorbic acid content in white clover during osmotic stress. As concern chlorophyll (Chl) metabolism, the MAN-treated plants showed significantly higher transcription of genes involved in Chl synthesis Mg-chelatase and protochlorophyllide reductase and lower transcription of pheophorbide a oxygenase and chlorophyllase related to Chl degradation and also a senescence associated gene 101 than untreated plants. In addition, the MAN application increased transcription of SK2-, Y2K-, and Y2SK-type dehydrin genes, and dehydrin b in leaves of white clover under osmotic stress. These results indicate that MAN plays important roles in drought tolerance not only acting as a compatible solute for OP but also delaying leaf senescence through enhancing antioxidant metabolism, decreasing Chl degradation, and increasing transcription of dehydrin genes contributing to enhanced drought tolerance in white clover.

Keywords: antioxidants, dehydrins, osmotic potential, photosynthesis, senescence, Trifolium repens.

Received: December 2, 2019; Revised: January 28, 2020; Accepted: January 29, 2020; Published online: May 26, 2020Show citation

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ZHAO, S.Y., ZENG, W.H., LI, Z., & PENG, Y. (2020). Mannose regulates water balance, leaf senescence, and genes related to stress tolerance in white clover under osmotic stress. Biologia plantarum, 64, 406-416. doi: 10.32615/bp.2020.017.
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