不同水分下桃果实细胞内糖酸分布特征分析

Distribution of the Sugar and Acid in Fruit Cells of Peach under Different Soil Moisture

为研究不同水分对桃果实细胞内糖酸分布的影响,以成熟白凤桃果实为试验材料,研究了2个土壤水分水平（W1：田间持水量的60%-70%,W2：田间持水量的75%-85%）对果肉细胞内可溶性糖（蔗糖、葡萄糖、果糖和山梨醇）和有机酸（苹果酸、柠檬酸、奎宁酸和莽草酸）在液泡、细胞质与细胞间隙中含量的影响。结果表明,W1处理桃果实液泡、细胞质和细胞间隙中可溶性糖分别为39.47,16.73,13.03 mg/g,有机酸分别为4.38,3.15,0.69 mg/g,而在W2处理中可溶性糖分别为35.63,16.11,13.33 mg/g,有机酸分别为4.00,3.27,0.65 mg/g,表明增加水分供应可降低液泡中可溶性糖与有机酸含量。各种糖、酸组分透过细胞膜的渗透速率均高于液泡膜,随着土壤水分含量升高果实中糖、酸通过细胞膜与液泡膜的渗透速率有所降低。

The aim of the present work was to evaluate the distribution and concentrations of sugars（ sucrose,glucose,fructose and sorbitol） and acids（ malate,citrate,quinate and shikimate） in vacuole,cytoplasm,and free space in peach fruits under two treatments（ W1： field capacity of 60%- 70%,W2： field capacity of 75%- 85%）.The results showed that sugars and acids in vacuole,cytoplasm and free space were 39. 47,16. 73,13. 03 mg / g,and4. 38,3. 15,0. 69 mg / g,respectively,in W1 treatment,and 35. 63,16. 11,13. 33 mg / g,and 4. 00,3. 27,0. 65 mg / g,respectively,in W2 treatment,which indicated that increasing water supply can reduce soluble sugar and organic acid content in vacuole. The permeation rate of sugars and acids through the cell membrane was higher than the vacuolar membrane. With the increase of soil water content,the permeability of sugars and acids in the fruits through the cell membrane and the vacuole membrane was decreased.