Effects Of Two Kinds Of Allelochemicals On Physiological Characteristics In Eggplant Seedlings(Solanum Melongena L.)

Treated with exogenous Phenol, 2,6-bis (1,1-dimethylethyl) and 1,2-Benzenedicarboxylic acid, dimethyl ester, two kinds of allelochemiacals, whose concentrations were 50,100,200,300μmol/L and 100,200,300,500μmol/L separately. Lanza NO.1 , which was one of the local varieties was selected as the material in this study. The effects of two kinds of allelochemicals on seed germination, seedling growth and physiological characteristics in eggplant were studied in substrate culture. The results showed that:Under the treatments of phenol, 2,6-bis (1,1-dimethylethyl) (>50μmol/L) and 1,2-Benzenedicarboxylic acid, dimethyl ester (>100μmol/L) , germination energy, germination rate, germination index and vigor index of eggplant seeds decreased. Meanwhile, the substances were the barrier of the length , fresh weight and activities of roots. Moreover, The seedling height, stem diameter, fresh weight, dry weight of eggplant seedlings were also decreased under these two kinds of allelochemicals. The number of newly-grown-out roots were small and the color was yellow, the activities of roots decreased as well. But the results of root and top ratio showed that the growth of root was more rapid than top. The integrated effect factor was used as a method to measure the allelopathy intensity of those two kinds of allelochemicals, whose results were that 1,2-Benzenedicarboxylic acid, dimethyl ester had larger allelopathy intensity. Phenol, 2,6-bis (1,1-dimethylethyl) and 1,2-Benzenedicarboxylic acid, dimethyl ester at different concentrations were the barrier of the content of chlorophyll, transpiratory rate, net photosynthetic rate and stomatal conductance. The intracellular CO2 concentration decreased in the former period and then increased. It indicated that the cause of reduction of net photosynthetic rate in eggplant in former period might be mainly stomata limitation and non-stomata limitation in later period. The two kinds of allelochemicals decreased Fv/Fm,φPSⅡ, Fv'/Fm', qp while increased Fo. The eggplant was under photoinhibition, the reaction center of PSⅡwas damaged. Phenol, 2,6-bis (1,1-dimethylethyl) made NPQ increase then decrease. 1,2-Benzenedicarboxylic acid, dimethyl ester decreased NPQ. In the earlier period when treated with phenol, 2,6-bis (1,1-dimethylethyl), the primary reaction of PSⅡreduced the requirement of ATP and NADPH by making the...