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《Acta Agriculturae Universitis Jiangxiensis》 1987-02
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STUDIES ON THE BIOLOGICAL EFFECTS OF PACLOBUTRAZOL ON PREVENTING EXCESSIVE GROWTH OF LATE-SEASON RICE SEEDLINGS AND ITS RELATIONSHIP WITH PHYTOHORMONES

Chen Shankun Pan Xiaoyun  
The present paper deals With the biological effects of Paclobutrazol onpreventing excessive Growth of late-season rice seedlings and their relation tophytohormones.The experiomental results showed:(1)The growth rate of late-season rice seedlings was very effectivelyinhibited by means of spraing 300 PPm Paclobutrazol aqueous solution 100 kgper Mu at the stage of one mature leaf and one new leaf of late rice seedlings.The leaf blade and sheath of the treated samples were shorter and wider thanthat of the control,and appeared a typical vigorous seedlings.The differencesin leaf anatomy between the treated seedlings and the control were that thecell size of the treated leaf blade and sheath was smaller than that of the controlin the longitudinal section,and the thickest part of treated leaf sheath consistof 8—9 layers of cells,but the control only 6—7 layers.(2)The inhibitory effects of paclobutrazol on the growth of rice seedlingsWere effected through controlling the biosynthesis or metabolism of phytohor-mones.Measuring the phytohormone of the treated rice seedlings compared withthe control by means of gas chromatography,it was showed that the IAAcontent of the treated samples was too law to appear in the gas chromatograph,but that of the control was as high as 22.1 μg/g fresh wt.The inhibition ofethylene release of the treated sample is directly proportional to the concentra-tion of paclobutrazol.
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