Stem girdling influences concentrations of endogenous cytokinins and abscisic acid in relation to leaf senescence in cotton

文献类型： 外文期刊

第一作者： Dai, Jianlong

作者： Dai, Jianlong;Dong, Hezhong

作者机构：

关键词： malondialdehyde: MDA;542-78-9;chlorophyll;zeatin: 1637-39-4;dihydrozeatin: 23599-75-9;dihydrozeatin riboside: 22663-55-4;abscisic acid: ABA;21293-29-8;endogenous phytohormone;cytokinins: endogenous phytohormone;plant growth;root development;crop yield;plant biomass;leaf senescence;plant physiology;dry root weight;species development;foliar development;squaring stage;stem girdling;main-stem leaf photosynthetic rate

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Many studies have shown that root-shoot imbalance influences vegetative growth and development of cotton (Gossypium hirsutum L.), but few have examined changes in leaf senescence and endogenous hormones due to stem girdling. The objective of this study was to determine the correlation between some endogenous phytohormones, particularly cytokinins and abscisic acid (ABA), and leaf senescence following stem girdling. Field-grown cotton plants were girdled on the main stem 5 days after squaring (DAS), while the non-girdled plants served as control. Plant biomass, seed cotton yield, main-stem leaf photosynthetic (Pn) rate, chlorophyll (Chl) and malondialdehyde (MDA) concentrations, as well as levels of cytokinins and ABA in main-stem leaves and xylem sap were determined after girdling or at harvest. Main-stem girdling decreased the dry root weight and root/shoot ratio from 5 to 70 days after girdling (DAG) and reduced seed cotton yield at harvest. Main-stem leaf Pn and Chl concentration in girdled plants were significantly lower than in control plants. Much higher levels of MDA were observed in main-stem leaves from 5 to 70 DAG, suggesting that stem girdling accelerated leaf senescence. Girdled plants contained less trans-zeatin and its riboside (t-Z + t-ZR), dihydrozeatin and its riboside (DHZ + DHZR), and isopentenyladenine and its riboside (iP + iPA), but more ABA than control plants in both main-stem leaves and xylem sap. These results suggested that main-stem girdling accelerated leaf senescence due to reduced levels of cytokinin and/or increased ABA. Cytokinin and ABA are involved in leaf senescence following main-stem girdling.

分类号： Q94

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