Mechanism of action of endogenous plant growth substances in fruit set and early fruit development of kiwifruit

研究了5ppm CPPU诱导的已授粉和未授粉果实和单性结实果实在开花至果实生长初期内源植物生长物质水平的变化，以及外源植物生长物质对海沃德单性结实的诱导和生长的影响。在授粉果实中，类Z活性在开花后第5天(DAA)达到高峰，20个DAA和GAS活性在第5天达到高峰。ZR样活性在开花期最高，IAA样物质在5d和9d之间高于其他时期。在单性结实果实中，它们的水平变化与授粉果实在开花前(JBA)和开花后1周(WAA)重复喷施Z、ZR和GA_3(1000ppm)时相似，诱导单性结实。但单性结实果实座果率较低，果实生长明显逊于…更多的是授粉的水果。0.1ppm的CPPU和50ppm的NAA处理没有诱导单性结实。GA_3+NAA处理重复使用JBA和1WAA，第一次处理使用JBA或NAA，第二次处理使用0.1ppm CPPU，诱导单性结实。单性结实和单性结实均优于GA_3诱导的单性结实。赤霉素4(1000ppm)+4-CPA(50ppm)、GA_7(1000ppm)+4-CPA、GA_4、GA_7、GA_7+-Z+4-CPA、Z+4-CPA和GA_4+GA_7+-Z+4-CPA处理1次，诱导单性结实。4-CPA处理促进果实生长，Z处理抑制果实生长。GA_4+GA_7+Z+4-CPA诱导的单性结实果实果实生长低于GA_7+Z+4-CPA诱导的单性结实果实。这些结果表明，高水平的GAs或细胞分裂素样活性，以及GM和IAA样活性与猕猴桃座果密切相关。另一方面，高水平的GAs、细胞分裂素和IAA样活性与果实早期发育有关。较少

Changes in the levels of endogenous plant growth substances in the pollinated and non-pollinated fruit and the parthenocarpic fruit induced by 5 ppm CPPU between the blooming and the early fruit growth stage, and effects of exogenous plant growth substances on induction of parthenocarpic fruit set and growth in 'Hayward' were investigated. In the pollinated fruit, the level of Z-like activity was at its peak 5 days after anthesis (DAA) and 20 DAA and GAs-like activities were at its peak 5 DAA. The level of ZR like activity was highest at anthesis and IAA-like substance was higher between 5 DAA and 9 DAA than another periods. In the parthenocarpic fruit, changes in their levels were similar to in the pollinated fruit When the treatment of Z, ZR and GA_3 (1000 ppm) were applied repeatedly just before anthesis (JBA) and 1 week after anthesis (WAA), parthenocarpy was induced. But fruit set percentages of the parthenocarpic fruits were lower and those fruit growth was remarkably inferior to … More the pollinated fruit. The treatment of 0.1 ppm CPPU and NAA (50 ppm) did not induced parthenocarpy. When the treatment of GA_3+NAA applied repeatedly JBA and 1 WAA, and GA_3 or NAA were applied JBA as first treatment and 0.1 ppm CPPU were applied 1 WAA as second treatment, parthenocarpy was induced. And those parthenocarpic fruit set and growth was superior to GA_3-induced one. When the treatment of GA_4 (1000 ppm) +4-CPA (50 ppm), GA_7(1000 ppm)+4-CPA, GA_4, GA_7, GA_7+-Z+4-CPA, Z+4-CPA and GA_4+GA_7+-Z+4-CPA were applied once JBA, parthenocarpy was induced. Treatments combined with 4-CPA promoted fruit growth and treatments combined with Z suppressed fruit growth Fruit growth of parthenocarpic fruit induced by GA_4+GA_7+Z+4-CPA was inferior to that induced by GA_7+Z+4-CPA. These results suggested that the high levels of GAs-or cytokinins-like activity, and GM-and IAA-like activity correlated strongly with fruit set of kiwifruit. On the other hand, the high levels of GAs-, cytokinins-and IAA-like activity correlated with early fruit development. Less