水分胁迫对苹果苗非结构性碳水化合物组分及含量的影响

Effects of Water Deficiency Stresses on Components and Contents of the Non-structured Carbohydrates in the Tissue-cultured Apple Seedlings

对红高富士苹果在轻度、中度、重度水分胁迫条件非结构性碳水化合物进行测定 ,结果表明 :①水分胁迫条件下 ,苹果同化物的积累主要是山梨醇、蔗糖、葡萄糖和果糖。②水分胁迫导致叶片和根系中溶质增加的主要原因是山梨醇含量的升高 ,其在苹果的渗透调解中起重要作用 ,由此可推知山梨醇 /可溶性糖是衡量水分胁迫后溶质变化及苹果对水分胁迫反应的有效指标。③适度水分胁迫处理使苹果叶片和根系中蔗糖含量升高、淀粉含量显著降低 ,表明水分胁迫条件下蔗糖及淀粉的变化在苹果抵御水分胁迫逆境反应中也起一定的作用。同时也为实践上调控干旱、半旱条件下果树的生长发育提供采取措施的基本思路和理论依据。

Under water stress,accumulation of photosynthesates in the apple seedlings included mainly with sorbitol,sucrose,glucrose,and fructose Water deficiency stress resulted in an increase of soluble substances in both leaves and roots,which was caused mainly by the increasement of sorbitol contents Furthermore,ratio of sorbitol/soluble sugars was a promising parameter of indicating both soluble substances changes under water deficiency stress and response of apple to water deficiency stress By stresses of mild or moderate water deficiency,sucrose contents were increased while starch contents were significantly decreased in both leaves and roots of apple seedlings,of which indicated that either sucrose or starch played a certain role in the tolerant responses of apple seedling to water deficiency stress