Accumulation of water-soluble carbohydrates and gene expression in wheat stems correlates with drought resistance.

摘要: In order to understand the effects of sugar metabolism on drought resistance in wheat, two wheat cultivars with different levels were used this study. We investigated accumulation pattern water-soluble carbohydrates (WSC) and expression profiles twelve fructan metabolism-related genes peduncle (PED), penultimate (PEN), lower internode (LOW) stem tissues under stress. LH7, a higher drought-resistance cultivar, contained dry weight content WSC PED, PEN, LOW tissues, while XN979, values. The from internodes had highest content, PED lowest. mRNA encoding synthesis-related enzymes, sucrose: sucrose 1-fructosyltransferase (1-SST), 6-fructosyltransferase (6-SFT), fructan: 1- fructosyltransferase (1-FFT) showed at early time points following stress, whilst degradation-related exohydrolases (1-FEH), invertase (INV), later point. Compared LH7 enzymes all growth stages, 1-FEH-W3, 6-FEH, INV3 stage; these would benefit remobilization respectively. Drought stress induced most related level decreasing but enhancing part results confirm that there are complex, coordinated patterns synthesis- stems summary, 1-SST-A2, 6-SFT, 1-FFT-A, play important roles accumulation. addition, synthesis degradation occurs during stages respectively, cultivar LH7.