The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 leve...The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 levels were obviously higher in flowered plants than in non-flowered. A peak value of GA3 in flowered plants occurred after appearance of the earliest auxiliary bud primorda which had the possibility of transforming into male cone bud primordia and before the morphological initiation of male cone bud primordia. Exogenously applied GA4/7 could enhance the endogenous GA3 and GA9, this may benefit the promotion of male cone buds in Chinese pine. The relations among ex-ogenously applied GA4/7 endogenous GAs, ABA and IAA in the shoot apices, and the initiation of male cone bud are discussed.展开更多
[Objective] This study was to obseve the flower bud differentiation process of Gentiana triflora Pall., and to clarify the flower bud development law and the correlation between flower buds differentiation and externa...[Objective] This study was to obseve the flower bud differentiation process of Gentiana triflora Pall., and to clarify the flower bud development law and the correlation between flower buds differentiation and external morphology. [Method] The paraffin section method was used to observe the flower bud of Gentiana triflora un- der microscope. [Result] The flower bud differentiation process of Gentiana triflora could be divided into six stages： the undifferentiated stage, initial differentiation stage, sepal primordia differentiation stage, petal primordia differentiation stage, stamen pri- mordia differentiation stage and the pistil primordia differentiation stage. The flower bud differentiation started from early May, when the plant had 10-11 stem nodes, and completed in early June, lasted about 40 d. The effect of plant height on flower bud differentiation was not significant. [Conclusion] The study provided theoretical basis for the high-yield cultivation, variety selection and flowering regulation of Gentiana triflora.展开更多
基金The research was funded by the National Natural Science Foundation of China
文摘The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 levels were obviously higher in flowered plants than in non-flowered. A peak value of GA3 in flowered plants occurred after appearance of the earliest auxiliary bud primorda which had the possibility of transforming into male cone bud primordia and before the morphological initiation of male cone bud primordia. Exogenously applied GA4/7 could enhance the endogenous GA3 and GA9, this may benefit the promotion of male cone buds in Chinese pine. The relations among ex-ogenously applied GA4/7 endogenous GAs, ABA and IAA in the shoot apices, and the initiation of male cone bud are discussed.
基金Supported by the Youth Fund of Heilongjiang University,China~~
文摘[Objective] This study was to obseve the flower bud differentiation process of Gentiana triflora Pall., and to clarify the flower bud development law and the correlation between flower buds differentiation and external morphology. [Method] The paraffin section method was used to observe the flower bud of Gentiana triflora un- der microscope. [Result] The flower bud differentiation process of Gentiana triflora could be divided into six stages： the undifferentiated stage, initial differentiation stage, sepal primordia differentiation stage, petal primordia differentiation stage, stamen pri- mordia differentiation stage and the pistil primordia differentiation stage. The flower bud differentiation started from early May, when the plant had 10-11 stem nodes, and completed in early June, lasted about 40 d. The effect of plant height on flower bud differentiation was not significant. [Conclusion] The study provided theoretical basis for the high-yield cultivation, variety selection and flowering regulation of Gentiana triflora.
