Effect of application of Brevibacillus laterosporus on potassium content of cured tobacco leav-es and physiological characteristics of tobacco plants
To explore the effect of application of Brevibacillus laterosporus on potassium content of cured tobacco leav-es and physiological characteristics of tobacco plants,four treatments were set up in the transplanting period of tobac-co,including no application of B.laterosporus(T1),root soaking of B.laterosporus(T2),root irrigation of B.lat-erosporus(T3)and root soaking +root irrigation of B.laterosporus(T4).The changes of potassium content of cured tobacco leaves,and photosynthetic pigment content,antioxidant enzymes activities,disease resistance of tobacco plants were measured.It was shown that the best application mode of B.laterosporus was root soaking + root irriga-tion.Compared with the T1 treatment,T4 treatment significantly(P＜0.05)increased the potassium content in the upper and middle cured tobacco leaves by 29.86%and 67.36%,respectively.The potassium content in tobacco root was significantly increased by 16.58%-28.85%under T4 treatment,and the incidence and disease index of tobacco weather fleck,tobacco anthracnose,tobacco brown spot and tobacco leaf spot were significanty decreased as compared with the T1 treatments.Besides,the chlorophyll content,carotenoid content,superoxide dismutase acitivi-ty,peroxidase activity were significantly increased by 13.21%-18.81%,21.01%-35.41%,9.63%-18.31%,11.62%-13.81%,respectively,and the malondialdehyde content was significantly decreased by 20.76%-30.99%under T4 treatment than those under T1 treatment.In general,application of B.laterosporu in the transplanting period by root soaking +root irrigation could enhance the resistance of tobacco plants and increase the potaasium content in cured tobacco leaves.
万方数据
维普
