Early Morphogenetic Changes During Phytochrome-induced Fern Spore Germination I. The Existence of a Pre-photoinduction Phase and the Accumulation of Chlorophyll

Aviah Zilberstein , Tova Arzee , J. Gressel
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引用次数: 7

Abstract

The relationship between light induced and dark metabolic processes occurring during synchronous germination of unicellular spores of the fern Pteris vittata was investigated. Light was almost totally ineffective as an inducer during a 12 to 16 h preinduction phase. Spores imbibed in the cold before illumination could not be induced to germinate, indicating that metabolic events occurring during the preinduction phase are required for the photomorphogenetic response. Two brief irradiations separated by two hours of darkness during a later, photoinductive phase were more effective in inducing germination than a single one of equal fluence. These short red-light illuminations induced more than 40% synchronous germination and enabled the separation between hydration and light effects. Chlorophyll formation is a phytochrome induced dark process in germinating spores, preceding the first nuclear division and rhizoid emergence. The formation of chlorophyll in ferns in the dark differs from light mediated chlorophyll synthesis in both angiosperms and gymnosperms as it is an enzymatic process, yet is mediated by phytochrome photoconversion.

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光敏色素诱导蕨类孢子萌发早期形态发生的变化1 .光诱导前期的存在与叶绿素的积累
研究了蕨类植物翼蕨(Pteris vittata)单细胞孢子同步萌发过程中光诱导和暗代谢过程的关系。在诱导前12 ~ 16 h,光作为诱导剂几乎完全无效。在光照前的寒冷环境中吸收的孢子不能被诱导发芽,这表明在诱导前阶段发生的代谢事件是光形态发生反应所必需的。在随后的光诱导阶段,两次短暂的照射间隔两小时的黑暗,比一次同等影响的照射更有效地诱导发芽。这些短红光光照诱导了40%以上的同步萌发,使水化和光效分离。叶绿素的形成是光敏色素诱导的孢子萌发的黑暗过程,在第一次核分裂和块根萌发之前。蕨类植物在黑暗中的叶绿素形成不同于被子植物和裸子植物中光介导的叶绿素合成,因为它是一个酶促过程,但由光敏色素光转化介导。
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