水杨酸对休眠期茶树光合作用和抗冻性的影响

Effect of Salicylic Acid on Photosynthesis and Cold Resistant in Tea Tree During Dormancy

为了探讨水杨酸对冬季茶树抗寒性的调控机制,以"龙井43号"茶树为试材,研究休眠期叶面喷施水杨酸对茶树叶片光合作用、叶片中碳水化合物含量和活性氧代谢的影响,结果表明,叶面喷施水杨酸30天后即能明显提高茶树叶片净光合速率,处理60天后,2mmol/L的水杨酸处理显著提高了叶片中可溶性总糖和淀粉含量、使丙二醛、活性氧含量显著下降,同时,叶片中脯氨酸含量、超氧化物歧化酶、过氧化氢酶和过氧化物酶活性显著升高,其它水杨酸处理虽然也能提高这些酶活性,但是效果不如2mmol/L的水杨酸处理显著。因此,在休眠期,叶面喷施适当浓度的水杨酸可显著提高茶树叶片的Pn和保护酶活性,从而提高茶树的抗寒性,这也有利于提高次年茶叶的产量与品质。

This paper aims to find out the regulator metabolism of salicylic acid on cold resistance in dormancy of tea tree. Effects of difference concentration of salicylic acid on photosynthesis, carbohydrate content and metabolism of reactive oxygen species in Longjing43 were studies. Results showed that net photosynthesis rates were obviously increased in 30th day after sprayed salicylic acid to tea foliar in dormancy. 2 mmol/L salicylic acid significantly increased total soluble sugar, starch contents, and significantly decreased foliar reactive oxygen species and MDA contents in 60th day after treatment. At the same time, the proline content, SOD, CAT and POD activities were significantly increased. Others concentration of salicylic acid also improved photosynthesis and protective enzymes activities, but the results were not as better as 2 mmol/L salicylic acid. It is concluded that foliar sprayed of suitable concentration of salicylic acid in tea tree＇s dormancy can improve photosynthesis and protective enzymes activities, and increase the cold resistant, in the end, the tea yield and quality in the next year could improve.