首页|Comparison of morphological, physiological, and related-gene expression responses to saline-alkali stress in eight apple rootstock genotypes
Comparison of morphological, physiological, and related-gene expression responses to saline-alkali stress in eight apple rootstock genotypes
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NSTL
Elsevier
? 2022Grafting cultivars onto rootstocks capable of high saline-alkalinization tolerance is a promising way to improve apple production under specific regions with saline-alkali stress. The morphological, physiological, and related-gene expression responses of eight apple rootstock genotypes, including ‘Zumi’, ‘Marubakaido’, ‘Qingzhen 1’, ‘SH.6’, ‘M.26’, ‘B.9’, ‘M.9-T337’ and ‘Mark 9’, to saline-alkali stress were investigated under a 1:1 molar ratio of 75 mM sodium chloride (NaCl) and sodium bicarbonate (NaHCO3) conditions. Morphological observations suggested that saline-alkali inhibited root development, limited biomass accumulation, and caused varying degrees of injury symptoms on leaves. Moreover, root activity and photosynthesis capacity of most genotypes declined. Still, the sodium (Na+) /potassium (K+) ratios, relative electrolyte conductivity (REC), malondialdehyde (MDA), proline, soluble protein, and soluble sugar contents were increased differently in all genotypes. Furthermore, the antioxidative enzyme activities (superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase (POD), and catalase (CAT)) and the expression levels of stress signal transduction related genes (MdRD22, MdRD29A, MdRD29B, MdAREB1A, MdAREB1B, and MdDREB2A) were increased or upregulated in some saline-alkali tolerance genotypes while decreased or downregulated in other sensitive genotypes. To sum up, the studied apple rootstocks were classified as highly tolerant (‘Zumi’ and ‘Qingzhen 1’); tolerant (‘M.9-T337’, ‘Marubakaido’ and ‘SH.6’); and susceptible (‘Mark 9’, ‘M.26’, and ‘B.9’) genotypes based on their saline-alkali stress indexes (SAI), average saline-alkali tolerance trait indexes (SATTI) and clustering analysis. These findings suggested that the rootstocks in current study are potential candidates for apple rootstocks against various levels of saline-alkali stress.
Apple rootstocksGene expressionMorphological changePhysiological responseSaline-alkali tolerance
Yang W.、Mobeen Tahir M.、Zhang X.、Li S.、Tang T.、Liu Y.、Ma J.、Wang C.、Zhang D.、Niu J.、Meng Z.
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College of Agriculture The Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization in Xinjiang Production and Construction Group Shihezi University
College of Horticulture Yangling Sub-Center of National Center for Apple Improvement Northwest A&F University
Xi'an Xianheng Agricultural Science and Technology Co. LTD
NSTL
Elsevier
