| The Prunus persica Terutemomo’was taken as research material in this experiment. It’s flowering process is divided into two stages that one is no flowering stage and the other is flowering stage. The no flowering stage is defined as the time that 5 percent of flower buds turn to white and flowering is defined as the time that 5 percent of buds turn to red. It was sprayed to different concentrations of gibberellin and salicylic acid in both periods. Then, the soluble sugar, soluble protein, C/N and endogenous hormone (GA, IAA, ZR, ABA) in the flower buds, buds and branches were tested to see the effects of two regulators on the physiological dynamic change of Prunus persica ’Terutemomo’, which aims to provide theoretical basis for regulating the flowering time of ornamental peach. The main results are as follows:(1) Its flower buds, buds and flower diameter were increased after Prunus persica ’Terutemomo’were sprayed with GA but sprayed with SA showed the opposite result. The results showed that GA could promote its flower buds, bud and petal growth and SA suppress its flower buds, buds and petals growth. The maximum flower diameter is 49.80 mm when sprayed 120 mg/L of GA and The minimum flower diameter is 45.11 mm when sprayed 30 mg/L of SA before flowering. At flowering stage, the maximum flower diameter is 52.94 mm when sprayed 150 mg/L of GA and The minimum flower diameter is 45.75 mm when sprayed 75 mg/L of SA.(2) About the regulation of flowering, different concentration of GA treatment didn’t advance the florescence. Besides, GA treatment before flowering made the blossom duration one day shorter than the control group. It maybe that the effects of GA on florescence is reflected when the flower bud formation or hibernation unfinished but flower buds already germinated when the first time we sprayed GA in this experiment. Sprayed SA at the two stages put off the blossom time 1-2 d than the control group and didn’t extend the duration of blossom yet.(3) Before flowering, the content of soluble sugar in flower buds and branches were increased in all groups in this experiment including the control group, GA treatment group and SA treatment group. The content of soluble sugar in flower buds increased 6%～18% and it increased 2%～13% in branches before flowering in all the groups. The content of soluble sugar in buds and branches at flowering were decreased in all the groups. The possible reason of this phenomenon was that soluble sugar was transferred to the flower buds and branches from other parts of tree’s body before flowering, which could save energy for blossom process. While at flowering, soluble sugar was consumed. It is speculated that increasing the content of soluble sugar in flower buds is benefit to blossom for Prunus persica ’Terutemomo’at the bud stage.(4) The content of soluble protein in flower buds was decreased in all the groups both before flowering and flowering. Probably, the soluble protein was consumed when the floral organ matured and developed before Prunus persica Terutemomo’ bloom. That is to say if increasing the content of soluble protein before blossom is advantageous to blossom for Prunus persica ’Terutemomo’.(5) Before flowering, the value of C/N was decreased in the control group, GA treatment group and SA treatment group in flower buds. On the contrary, the value of C/N was increased in the control group, GA treatment group and SA treatment group at flowering. It is probably that flower buds germinated and its physiological and metabolic activities was active before flowering so that lots of nitrogen was transported to flower buds to participating metabolic activities. While at flowering, metabolic activities tended to be gentle and the amount of nitrogen’s synthesis was decreased.(6) Before flowering, endogenous GA, IAA, ZR in the flower buds was increased while ABA was decreased in the control group, GA treatment group and SA treatment group. At flowering, endogenous GA content was decreased and the change of endogenous IAA, ZR, ABA was the same to no flowering stage. During the flower buds germination time, endogenous GA, IAA, ZR was increased and ABA decreased. These changes may be conducive to blossom for Prunus persica Terutemomo’. |
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