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10～15年生结果的火炬松(Pinus taeda)雌孢子叶球的发育,一般要经过二年(越过二个冬天)才能成熟。试验结果表明,雌孢子叶球芽当发育形成原始体之后,必须经过秋冬低温时期,进行生理休眠。越冬后,随着气温的上升,逐步发育成为一年生孢子叶球。这些一年生孢子叶球再经过第二次秋冬低温休眠期,最后在翌年秋季成熟。这两次低温休眠期对于雌孢子叶球的发育是必不可少的。而雄孢子叶球和营养芽在发育过程中,虽然也有类似的休眠现象,但在生理上却不一定是必不可少的,它可以通过人为措施来打破。 材料和方法 在阿肯什州中部火炬松种子园中(无性系WMAPT—1)采取带有花芽(雌、雄孢子叶球芽,一年生孢子叶球)或营养芽的接穗,嫁接到盆栽的二年生火炬松苗上。
Pinus taeda, the result of 10-15 years of age, develops in the spores of the spores and usually takes two years (over two winters) to mature. The test results show that, when the sporophyte buds of female sporophytes develop into protoplasts, they must undergo physiological dormancy during the autumn-winter low temperature period. After winter, with the temperature rise, and gradually develop into conidiophores. These conidiophores then undergo the second fall dormancy in autumn and winter and finally mature in the following autumn. These two hypothermic dormant stages are essential for the development of the sporophyte of the female spore. While male spore leaf ball and vegetative bud in the development process, although there are similar dormancy phenomenon, but it is not necessarily essential in the physical, it can be through artificial measures to break. MATERIALS AND METHODS Grafts with floral buds (female, male spore buds, annual spheroplasts) or vegetative shoots were grafted onto potted biennials (clones WMAPT-1) in central loblolly pine seed orchard in central Arkansas Torch pine seedlings.