海藻糖对低温胁迫亚洲百合幼苗生长及生理响应的影响

Effect of Trehalose on the Growth and Physiological Response of Lilium Asiatic hybrids Seedlings Under Low Temperature

  • 摘要: 以亚洲百合幼苗为试验材料,海藻糖(0、10、15、25、35 mmol/L)叶片喷施处理后再进行4 ℃低温胁迫,分析海藻糖对亚洲百合幼苗生长的影响。结果表明:适宜浓度的海藻糖叶片喷施处理对低温逆境中亚洲百合幼苗生长有促进作用,15 mmol/L海藻糖处理可增加亚洲百合地上部、地下部干鲜质量,植株鲜质量可增加41.86%,株高净增长率显著增加1.43倍;海藻糖处理提高了亚洲百合叶片中叶绿素、类胡萝卜素的含量,缓解了光合色素中叶绿素总量57.34%的降解,有利于亚洲百合幼苗的生长和植株生物量的积累。海藻糖处理增强亚洲百合叶片中25.50%可溶性蛋白和48.19%可溶性糖、脯氨酸的含量及抗氧化酶POD、SOD、CAT和APX的活性,降低了H2O2、O2−、MDA的含量,促进渗透调节物质的积累,从而提高了亚洲百合的抗寒性,在一定程度上缓解低温胁迫对亚洲百合幼苗的伤害。

     

    Abstract: Using Lilium Asiatic hybrids seedlings as experimental materials, the effect of trehalose (0, 10, 15, 25, 35 mmol/L) on the growth of L. Asiatic hybrids seedlings was studied by spraying the leaves and then subjecting them under 4 ℃ low temperature. The research results indicated that spraying appropriate concentrations of trehalose on the leaves promoted seedling growth under low temperature. Treatment with 15 mmol/L trehalose can increase the dry and fresh qualities of the aboveground and underground parts. The fresh qualities of plant increased by 41.86% and the net growth rate of plant height increased by 1.43 times. Trehalose treatment enhanced chlorophyll and carotenoid in leaves, reduced the degradation of total chlorophyll in photosynthetic pigments by 57.34%, and supported the seedling growth as well as the accumulation of plant biomass. It can enhance the content of 25.50% soluble protein, 48.19% soluble sugar, proline, and the activity of antioxidant enzymes POD, SOD, CAT, and APX in the leaves, reduce the content of H2O2, O2−, and MDA, promote the accumulation of osmoregulatory substances, thereby improving the cold resistance and alleviating the damage of low temperature stress to L. Asiatic hybrids seedlings to a certain extent.

     

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