葡萄叶浸提液对'四季快菜'生长和光合特性的影响OA

Taking the leaf extracts of three grape varieties including Vitis vinifera'Summer Black','Hutai'and'Red Globe'as test materials,four concentration treatments(CK,0.005 g·mL-1,0.010 g·mL-1,0.020 g·mL-1)were set to study the relationship between the extracts and the photosynthetic characteristics of Brassica campestris'Sijikuaicai'seeds and seedlings,in order to provide reference for optimizing the grape-vegetable intercropping pattern.The results showed that under the concentration of 0.005 g·mL-1,the leaf extracts of'Hutai'and'Red Globe'increased the germination rate of'Sijikuaicai'by 16％and 8％compared with CK,respectively.Low-concentration extracts mostly showed a promoting effect;for instance,the 0.005 g·mL-1 leaf extract of'Hutai'significantly increased the root length,seedling height and seedling fresh weight of'Sijikuaicai'.In terms of photosynthetic characteristics,different concentrations of extracts from different varieties had distinct effects on the photosynthetic indexes of'Sijikuaicai'.When the concentration of'Hutai'leaf extract was 0.010 g·mL-1,the net photosynthetic rate was 150.32％higher than that of CK.At the concentration of 0.020 g·mL-1,the leaf extract of'Summer Black'significantly improved the net photosynthetic rate,water use efficiency and stomatal conductance,which were 24.77％,102.51％and 74.90％higher than those of CK,respectively.There were significant differences in allelopathic effects among different grape varieties.Low-concentration grape leaf extracts promoted the growth and photosynthetic efficiency of'Sijikuaicai'.The'Hutai'leaf extract at the concentration of 0.005 g·mL-1 had great application potential.