Relationship between Contents of Mature Fruits at Different Growing Positions and Seed Vivipary of Ardisia crenata var.bicolor
To explore the relationship between mature fruit contents and seed vivipary of Ardisia crenata var.bicolor,the outer viviparous and inner non-viviparous fruits from the same branch were selected as materi-als.The morphological characteristics,the contents of soluble protein,soluble sugar and starch,and the activ-ities of antioxidant enzymes and amylase in epicarp,mesocarp,endocarp,endosperm and radicle of viviparous seeds were studied,and the correlations among the indicators were analyzed.The results showed that seed vivipary of A.crenata var.bicolor was related to the length of fruiting period.There was no significant differ-ence in the transverse and longitudinal diameters between viviparous and non-viviparous fruits,but significant differences were observed in hundred-grain weight and contents of different fruit parts,which were higher in non-viviparous fruits compared with viviparous fruits,especially in endocarp.After seed vivipary,the contents of soluble protein,soluble sugar and starch in different parts of mature fruits,as well as activities of α-amylase and β-amylase were significantly reduced,which rapidly accumulated in the radicle and could provide energy for the growth and development of embryo;but the activities of superoxide dismutase(SOD)and peroxidase(POD)were the lowest in radicle.Correlation analysis showed that,for the viviparous fruits,SOD activity was significantly negatively correlated with soluble protein content,POD activity was significantly or extremely sig-nificantly negatively correlated with soluble sugar and starch contents,while the starch content was negatively correlated with activities of α-amylase and β-amylase,which indicated that the soluble protein,carbohydrates and enzymes in different parts of fruits might collaboratively participate in the metabolism of embryo develop-ment.
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