柑橘果实生长发育过程中果实不同部位的4种内源激素含量变化的研究

以单性结实的国庆1号温州蜜柑和自花结实的华农本地早橘为材料,研究了果实生长发育过程中果实不同部位的吲哚乙酸(IAA)、脱落酸(ABA)、赤霉素(GA1/3)和玉米素核苷(ZR)含量的变化。结果表明:(1)国庆1号果皮IAA、GA1/3和ZR含量在幼果阶段均相对较高,随后果皮和果肉IAA含量均趋下降,而在果实膨大期内果肉ABA和果皮、果肉GA1/3、ZR含量均出现上升峰值,果实成熟采收时果皮和果肉ABA含量均明显回升。(2)华农本地早种子、果皮和果肉IAA及其种子ABA含量均在果实膨大期内出现明显峰值,在幼果阶段至果实膨大初期内种子GA1/3和ZR含量均居较高并出现明显上升,对应的果皮、果肉4种内源激素水平均相对较低且变幅小。还就两结实类型柑橘果实生长发育与其内源IAA、ABA、GA1/3和ZR含量动态的关系进行了讨论。

Study on changes in concentrations of four endogenous hormones in different fruit positions during citrus fruit growth and development

Changes in concentrations of indol-3-acetic acid (IAA), abscisic acid (ABA), gibberellin (GA1/3)and ribosylzeatin (ZR) were investigated in different fruit positions (rind,pulp and seed) during fruit growth atively high during young fruit growth, and then IAA in the rind and pulp was decreased progressively, whereas significant peaks were observed for ABA in the pulp and GA1/3, ZR in the rind and pulp during fruit enlargement,and ABA concentrations were obviously increased in the rind and pulp during fruit maturation. In 'Huanong Bendizao' ,notable peaks were found for IAA in the seed,rind and pulp and seed ABA at the stage of fruit enlargement,GA1/3 and ZR concentrations in the seed were relatively high and significantly increased during fruitlet growth and early fruit enlargement, whereas the levels of four endogenous hormones in the rind and pulp were relatively low and changed a little as time passed. Relationship between fruit growth and development and dynamics of endogenous IAA,ABA,GA1/3 and ZR concentrations in different fruit parts was discussed herein.