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用不同浓度 PP3 3 3 溶液对溪蜜柚大枝及叶片进行喷布处理 ,取叶样制作石蜡切片观察其组织结构 ,同时用电导法测不同低温下叶片细胞膜伤害率 ,1a后对树体枝梢生长情况调查结果表明 ,PP3 3 3 处理可使溪蜜柚叶片上、下表皮细胞层数 ,栅状组织层数增加 ,厚度增大 (海绵组织厚度变化不明显 ) ,叶片厚度及叶片组织结构紧密度分别比对照增加 2 0 .36 %～ 37.71%和 11.55～17.96个百分点 ;细胞膜伤害率显著降低 ,抗寒性增强 ;PP3 3 3 处理缩短了新梢长度、节间长度 ,增加了新梢粗度。 750～ 10 0 0 mg· L-1的 PP3 3 3 可作为生产上调控柚树营养生长的适宜浓度
The branches and leaves of pomelo peel pomelo were sprayed with different concentrations of PP3 3 3 solution. The leaf samples were taken to make paraffin sections to observe the histological structure. Meanwhile, the cell membrane injury rate of leaves at different low temperatures was measured by conductivity method. The results of shoot growth showed that PP3 3 3 treatment could increase the number of layers of upper and lower epidermis, the number of palisade tissue layers and the thickness of spongy pomelo (the thickness of spongy tissue did not change obviously), the leaf thickness and leaf tissue The structural compactness was increased by 20.36% -37.71% and 11.55-17.96% respectively compared with the control. The damage rate of cell membrane was significantly reduced and the cold resistance was enhanced. PP333 treatment shortened the shoot length and internode length, increased the new Thickness of the tip PP3 3 3 of 750 ~ 100 mg · L -1 could be used as a suitable concentration for regulating the vegetative growth of pomelo trees