Effect of Exogenous Methylglyoxal(MG)on Physiological Characteristics of Chestnut Seedlings under Salt Stress
Methylglyoxal(MG)is a newly discovered signaling molecule that plays an important role in regulat-ing plant development and stress resistance processes.In order to explore the physiological mechanism of MG alleviating salt stress damage to chestnut seedlings,the effects of 0.5 mmol/L MG and its scavenger N-acetyl-cysteine(NAC)on the antioxidant system,glyoxase system,and osmoregulatory substance content of chestnut seedlings under salt stress(NaCl content of 200 mmol/L)were studied in the 2-year-old seedlings of the chestnut variety Mengzao.The results showed that the application of exogenous MG could increase the activity of antioxidant enzymes(SOD,POD,CAT,APX and GR)in chestnut seedlings under salt stress,activate the glyoxase system(GlyⅠ and GlyⅡ enzyme activities increased),regulate the AsA-GSH cycle,increase the con-tent of antioxidants(GSH and AsA),and the accumulation of osmotic regulator proline(Pro)in leaves,while reduce the accumulation of malondialdehyde(MDA),MG,and superoxide anion(O2-),relieve the damage caused by MG stress,oxidative stress,and osmotic stress on chestnut seedlings under salt stress,and enhance the salt tolerance of chestnut seedlings.After adding the MG scavenger NAC,the alleviating effect of MG was inhibited.MG has a positive effect on enhancing the salt tolerance of chestnut.Studying MG as a new ex-ogenous regulatory substance to regulate plant stress resistance provides important theoretical basis for ex-panding the applicability of chestnut and exploring chestnut resources in saline alkali areas.
万方数据
维普
