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本文应用不同的光质和光量等方法研究木麻黄种子的需光生物学特性。该种子对光照反应敏感,白光5分钟(10001ux)而红光(8.5×10~3尔格)10秒闪射就能刺激萌发,短暂的高强度光不能增大萌发数,但每天给予8小时10001ux光照可以使种子获得充分萌发。红光促进萌发,远红光抑制萌发,当它们交替处理时,其作用效应是可逆的,萌发反应决定于最后一次光照。 通过低温和ABA、NaF处理种子以了解其与光萌发关系,确认Pfr的原发效应是一种光化学反应。通过远红光追迹红光后的暗逆转作用,对Pfr·x结合体假说,从反应的时间进程与光形态表达上进行了初步分析。试验论证了种子浸湿后用红光、荧光灯,白炽灯、太阳光重新干燥,会导致种子暗萌发增加,其中,红光最为有效,这解释为红光比白光能建立高的Pfr/p值有关。最后,通过日照昼夜变化试验及对林荫下的生境和光透过绿叶后的光质变化对种子萌发影响的观察讨论了光敏素在种子光萌发中的生态学意义。
In this paper, different light quality and light intensity were used to study the ophthalmological characteristics of Casuarina equisetifolia seeds. The seed is sensitive to light, white light 5 minutes (10001ux) and red light (8.5 × 10 ~ 3 Ergo) 10 seconds flash can stimulate germination, short-term high-intensity light can not increase the germination number, but given 8 hours a day 10001ux light Seed can be fully germinated. Red light to promote germination, far red inhibition of germination, when they are alternately treated, its role is reversible, germination reaction depends on the last light. By low temperature and ABA, NaF seed treatment to understand its relationship with light germination, the primary effect of Pfr was confirmed to be a photochemical reaction. After the red light was reddish and the far-red light was dark-redned, the Pfr · x conjugate hypothesis was first analyzed from the time course of the reaction and the light morphological expression. The experiment demonstrated that after the seeds were wetted, the seeds were re-dried with red light, fluorescent light, incandescent light and sun light, which led to the increase of dark germination. Among them, red light was the most effective, which explained that Pfr / p value of red light was higher than that of white light related. Finally, the ecological significance of phototransmitters in seed light germination was discussed by observing the diurnal variation of sunshine and the effect on seed germination of the seeds under the shade of the habitat and the change of the light quality after light passed through the leaves.