The Effects Of Root Restriction And Different Plant Growth Regulators On The Development Of Grapevines

The objective of this paper was to study the effects of root restriction on photosynthetic characteristics and the sucrose metabolism of leaf and grape berry during the 'Houman' berry development. At the same time, some experiments were conducted with 'Wink' and 'Summer Black' to study the effects of different plant growth regulators on the development of berry. The effects of ABA on coloring rules of 'Yatomi Rosa' and Benibalade were analyzed.The results were as follows:1.Compared with control, the leaves of 'Houman' grapevines under root restriction had lower level of total chrolophyll contents. The diurnal variation of Pn in root restriction was accordance with that in control. Compared with control,the RR had higher net photosynthetic rate (Pn),stomata conductance (Gs) and transpiration ratio (Tr).During the grape berry development, the leaves of 'Houman' grapevines under root restriction have lower content of sucrose. Higher enzyme activity and their comprehensive action could explain the mechanism by which root restriction affected sugar accumulation in leaves.Total sugar content and the enzyme activities related with sucrose metabolism in berries from the root restriction was higher than that of control in the later stages of berry development. Higher enzyme activity and their comprehensive action in the later stages of berry development could explain the mechanism by which root restriction affected sugar accumulation, ultimately improved berry qualities.2.Experiment was conducted with Wink. The treatments were 3,5,7.5mg/L GA3 before flowering with 25mg/L GA3 on blossom and 25mg/LGA3+5mg/LCPPU 2weeks after blossom. The results showed that the best treatment is 7.5mg/L GA316d before flowering, which less fruit cluster was 28.81% more than the control. Experiment was conducted with Summer Black. The treatments were 3,5,7.5mg/L GA3 before flowering with 50mg/L GA3 on blossom and 25mg/LGA3+5mg/LCPPU 2weeks after blossom. The results showed that the best treatment is 7.5 mg/L GA315d before flowering, which less fruit cluster was 51.02% more than the CK. Different GA3 treatment significantly increased tratable acid content, while total soluble solids content reduced.3.Experiment was conducted with Summer Black. The treatments were 50mg/L GA3 on blossom and 50mg/LGA3 with 1,3,5mg/LTDZ 2weeks after blossom. The control were without the plant growth regulators of cytokinin type and with 3mg/LCPPU 2weeks after blossom.The results showed that with different concentration TDZ 2weeks after blossom significantly increased the length and diameter of the berry. The best significant treatment is with 5mg/LTDZ 2weeks after blossom, which average berry weight was 6.65g. Diffenent contments had not significant difference on the effects of length/diameter ratio and titratable acid content,whereas had less total soluble solids content. Diffenent contments significant increased the content of anthocyanin, the date was 67.55%,99.87%,73.18% respectively more than the control without the plant growth regulators of cytokinin type.4.'Yatomi Rosa' and 'Benibalade' were used to study the effects of ABA on coloring.The results showed that berry coloration is the comprehensive result of chlorophyll content decreasing and anthocyanin content increasing during the grape berry development. Exogenous ABA accelerated the degradation of chlorophyll and advanced coloring.The 100mg/L ABA advanced. The content of anthocyanin under 100mg/L ABA was more advanced than that of the control(9d and 12d in advance in 'Yatomi Rosa' and 'Benibalade').