Shoot Apex Regulates Growth, Endogenous Hormone and Potassium  and Nitrogen Accumulation in Flue-cured Tobacco

Abstract

Abstract: 【OBJECTIVE】Effects of decapitation and plant growth regulator on plant growth, endogenous hormones and N, K accumulation were examined within 2 weeks.【METHOD】The method of enzyme-linked immunosorbant assay (ELISA) was employed to determine the contents of indoleacetic acid (IAA), abscisic acid (ABA), gibberellin (GA3) and Zeatin(ZR) under pot culture. 【RESULTS】The results showed that the content of endogenous hormone IAA, ABA, GA3 and ZR decreased in leaves and increased in roots of decapitated plants compared to no decapitated plants. The content of IAA in leaves of decapitated plants was 2-fold lower than that of no decapitated plants at 1h, and it represented a 140.70% and 110.77% rise in roots compared to that of no decapitated and IAA-treated plants at 14d. The GA3 content in roots of decapitated plant was 124.18% and 106.66% higher than that of no decapitated plants at 5h and 24h, respectively. In decapitated and IAA-treated plants, the net increases in dry matter and nitrogen accumulation were allocated into the middle and upper leaves, stems and roots, and potassium accumulation increased in middle, upper leaves and roots, but the potassium accumulation in whole plant and stems were lower than that of no decapitated plants.【CONCLUSION】The shoot apex can regulate the accumulation of dry matter, endogenous hormone, potassium and nitrogen among different organs of tobacco. Applications of plant exogenous growth regulator after removel of the shoot apex can partly replace the role of the shoot apex.

CLC Number:

S572

Dai Xiaoyan, , Su Yirong, Chen Fenglei, Long Wen, Chen Xiangbi, Fan Yekuan. Shoot Apex Regulates Growth, Endogenous Hormone and Potassium
and Nitrogen Accumulation in Flue-cured Tobacco
[J]. Chinese Agricultural Science Bulletin, 2008, 24(8): 234-240.

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Shoot Apex Regulates Growth, Endogenous Hormone and Potassium
and Nitrogen Accumulation in Flue-cured Tobacco

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