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以春石斛为试材,研究光周期对其开花及多胺(腐胺、亚精胺和精胺)含量的影响,以期了解春石斛开花的光周期特性以及期间能源物质多胺的变化规律。结果显示,春石斛短日照处理植株开花较长日照处理的提前约18 d,为称量性短日照植物;同时,短日照处理植株的花芽多,开花量大,花径较长日照大。不同光周期诱导开花过程中,春石斛叶片内腐胺含量最高,波动较大,短日照处理下基本维持比长日照高的水平。亚精胺含量其次,且随生长发育逐渐升高,短日照处理下一直保持比长日照高的水平。精胺含量最低,变化不大,短日照下保持与长日照相同或略高的水平。由此推测,春石斛为称量性短日照植物,高水平的腐胺和亚精胺可能与春石斛花芽的形成有关。
The effects of photoperiod on flowering and polyamine (putrescine, spermidine and spermine) contents were studied in order to understand the photoperiodic characteristics of flowering and the change law of polyamines during the period. The results showed that the short daylength of the plants treated with short daylength of Dendrobium nobile increased about 18 days in advance, which was a weighing short-day plant. At the same time, short-day treatment had more flower buds, larger flowering and longer flower diameter. During the different photoperiod-induced flowering process, the content of putrescine in the leaf of Dendrobium chrysogenum had the highest volatility, and remained largely higher than that of the long day under short daylight. Spermidine content followed, and with the growth and development gradually increased, short-day treatment has been maintained higher than the long-day level. Spermine content is the lowest, little change, under the short sunshine to maintain the same or slightly higher than the level of long sunshine. It is speculated that the spring Dendrobium Weighing short-day plants, high levels of putrescine and spermidine may be related to the formation of flower buds of Dendrobium.