早熟桃夏季红叶现象的生理机制研究

Studies on Physiological Mechanism of Red Leaf Phenomena of Early Maturing Peach in Summer

为了揭示早熟桃夏季红叶现象的生理机制,以采果后叶色变红现象明显的‘早美’和‘春蕾’两个早熟桃品种为试材,分析夏季叶色转变过程中叶片色素和可溶性糖含量、花色素苷合成相关酶活性及净光合速率等生理指标的变化趋势。结果表明:早熟桃果实采收后叶片可溶性糖大量积累,二氢黄酮醇还原酶(DFR)等花色素苷合成相关酶活性的增加。叶片转色初期苯丙氨酸解氨酶(PAL)和查尔酮异构酶(CHI)活性变化较小,与叶片花色素苷含量相关性不显著;叶色转红之后PAL和CHI活性与叶片花色素苷含量显著正相关。

To uncover the physiological mechanism of red leaf phenomena of early maturing peach in summer, two early maturing peach cultivars （ ＇Zaomei＇ and ＇Chunlei＇ ） were used to research the changes of leaf pigments, soluble sugar content, anthocyanin biosynthesis related enzyme activity and net photosynthetic rate. The results showed that leaf soluble sugar accumulation increased after fruit harvesting. DFR rised obviously, PAL and CHI activity did not change much and showed no significant correlation with anthocyanin content at the early stage of leaf coloring. However, there was a significant positive correlation between PAL, CHI activity and anthocyanin content after leaves changed to be red.