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Growth and solute composition in two wheat species experiencing combined influence of stress conditions

机译:两种小麦品种的生长和溶质组成受胁迫条件的综合影响

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The effects of environmental stress combinations on the soluble metabolites were investigated in several cultivars of Triticum aestivum and T durum. The seedlings grown at optimum (24/16degreesC), low (5/-5degreesC) (LT), and high (40/30degreesC) (HT) dayight temperature conditions were exposed to waterlogging, drought, and salinity (0.7% NaCl, w/w) stresses for six days. Root and shoot fresh weight significantly decreased under waterlogging, drought and salt stresses. Fresh weight was most reduced at severe drought + HT combinations. The lowest relative water content was found under drought stress + HT combination. Soluble carbohydrate (SC) contents increased under LT conditions, but decreased under HT conditions. Under HT + salt combinations, T aestivum genotypes showed higher SC content than T durum genotypes. Proline content significantly increased in the case of water deficit and salt stress. Under drought and salt stresses, T aestivum genotypes had lower proline contents than T durum genotypes. These results indicate that biochemical responses to drought, waterlogging, and salt stresses were significantly changed in wheat seedlings under LT and HT conditions.
机译:研究了几种普通小麦和杜伦麦的环境胁迫组合对可溶性代谢产物的影响。在最佳(24/16摄氏度),低(5 / -5摄氏度)(LT)和高(40/30摄氏度)(HT)日/夜温度条件下生长的幼苗暴露于涝渍,干旱和盐度(0.7%NaCl ,w / w)压力六天。在淹水,干旱和盐胁迫下,根和芽的鲜重显着降低。在干旱和高温条件下,鲜重最大程度地降低。干旱胁迫+高温胁迫下相对含水量最低。可溶性碳水化合物(SC)含量在低温条件下增加,但在高温条件下下降。在HT +盐组合下,普通小麦的基因型显示出的SC含量高于硬质小麦的基因型。在缺水和盐胁迫的情况下,脯氨酸含量显着增加。在干旱和盐胁迫下,普通小麦的基因型脯氨酸含量低于硬质小麦的基因型。这些结果表明,在低温和高温条件下,小麦幼苗对干旱,内涝和盐胁迫的生化响应发生了显着变化。

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