不同土壤含水量对温室百香果氮代谢相关酶活性的影响OA

The effects of different soil water contents on the activities of enzymes related to nitrogen metabolism of Passiflora edulis Sims in greenhouse was studied to provide a theoretical basis for scientific water management in greenhouse Passiflora edulis Sims cultivation.Four water treatments were set up under greenhouse cultivation conditions:conventional irrigation as the control(T1);soil water content was maintained at 45%-60%of field capacity(FC)during vegetative growth period after transplanting,and recovered to 90%FC after 45 days,and when the soil water content decreased to 50%FC,it was watered to 90%FC(T2);soil water content kept at 45%-60%FC at early growth stage,75%-90%FC at middle growth stage,and 70%-80%FC at late growth stage(T3);soil water content maintained at 75%-90%FC at whole growth stage(T4).The changes in the activities of enzymes related to nitrogen metabolism of Passiflora edulis Sims from June to September were studied.The results showed that:the nitrate reductase activity of T4 was significantly higher than that of T1,T2 and T3 in June,July and September;the glutamine synthetase activity of T4 was significantly higher than that of T2 and T3,and the glutamate synthetase activity was significantly higher than that of T1,T2 and T3 from June to September;compared with T1,T2 and T3,T4 was significantly increased glutamate dehydrogenase activity in June,August and September;T4 was significantly increased the activities of aspartate aminotransferase and alanine aminotransferase compared with T2 and T3 in June and August.Comprehensive analysis showed that maintaining soil water content at 75%-90%FC during the whole growth period of Passiflora edulis Sims cultivation in greenhouse had the best effect on improving the activities of enzymes related to nitrogen metabolism.