The Maturation and Senescence in Relation to Ca2+ , CaM Content and Ca2+ -ATPase Activity and Active Oxygen Metabolism in Strawberry Fruits

摘要

The changes in content of Ca2 + and CaM, Ca2 + -ATPase activity and active oxygen metabolism during strawberry (Fragaria ananassa Duch. cv. Chunxing) fruits maturation and senescence were investigated in this study. The results showed that the soluble Ca2 + content and SOD activity in fruits tended to decline and O2.-production rate to increase, the Ca2+ -ATPase activity peaked at first and then declined during fruits maturation and senescence. There were the highest CaM content at white stage in preharvest fruits and at marked senescence stage in postharvest ones. The above biochemical changes in fruits stored at low temperature (4℃) were slower than those stored at normal temperature(25℃ ). Thus, it indicated that the stimulation of calcium messenger system and accumulation of active oxygen free radical were closely related to fruits maturation and senescence.