Evaluation of Growth under Non-24 h Period Lighting Conditions in Lactuca sativa L.

Q3 Agricultural and Biological Sciences
Takanobu Higashi, S. Nishikawa, N. Okamura, H. Fukuda
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引用次数: 21

Abstract

Nearly all living organisms have an endogenous circadian clock that generates a circadian rhythm with a periodicity of approximately 24 h. This rhythm is synchronized with the external environment and regulates many of the physiological processes of organisms. In animals, the circadian rhythm is generated by an endogenous circadian clock core located in the brain, and its resynchronization to different time zones is commonly referred to as “jet lag” (Yamaguchi et al., 2013). Conversely, in plants, the indigenous clock functions at the level of individual cells, which interact to produce the circadian rhythm in plant tissues, organs, and the entire organism (Fukuda et al., 2007; 2012). The circadian rhythm in plants regulates the timing of gene expression, which may for example result in peak expression of photosynthesis genes from early morning to noon, sugar transport genes from late afternoon to evening, and genes involved in fragrance production from late evening to early morning (Harmer et al., 2000). The circadian clock is comprised of a basis of three components: the input pathway, which transmits the lightdark cycle of the environment and other external stimuli to the endogenous oscillator; the endogenous oscillator itself, which generates the circadian rhythm with a periodicity of approximately 24 h; and the output pathway, which transmits the rhythm generated by the oscillator to control various physiological activities (Harmer, 2009). Most of the molecular genetics studies on circadian clocks in higher plants have been undertaken in the model organism, Arabidopsis thaliania (Mizoguchi et al., 2002; McClung, 2006; Harmer, 2009; Pruneda-Paz and Kay, 2010). Some of these studies have demonstrated how gene clusters, such as CCA1 (CIRCADIAN CLOCK ASSOCIATED 1), TOC1 (TIMING OF CAB EXPRESSION 1), PRRs (PSEUDO-RESPONSE REGULATORs), and LHY (LATE ELONGATED HYPOCOTYL) are involved in the oscillator, and how these “clock genes” play a central role in the formation of the circadian rhythm (Alabadí et al., 2001; Nakamichi et al., 2004; 2010; 2012). Proteins involved in the input pathway include phytochromes and cryptochromes, which are redand blue-light photoreceptors, respectively (Pruneda-Paz and Kay, 2010). Other factors known to be involved in the input pathway include phototropins, which are capable of both greenand bluelight photoreception (Briggs and Christie, 2002), as well as the F-box protein ZEITLUPE, which are the new blue-light photoreceptor proteins (Somers et al., 2000; 2004; Kim et al., 2007). Numerous other factors are involved in the output pathway, as evidenced by the circadian clock regulation of photosynthesis, respiration, stomata opening/closing, stem elongation, leaf opening, flowering, and a variety of other higher-plant functions (Harmer et al., 2000; Graf et al., 2010; Farré, 2012). A key factor in the regulation of physiological proc-
非24 h光照条件下芥蓝生长的评价。
几乎所有生物都有一个内源性生物钟,产生周期约为24小时的昼夜节律。这种节律与外部环境同步,调节生物的许多生理过程。在动物中,昼夜节律是由位于大脑中的内源性生物钟核心产生的,它与不同时区的重新同步通常被称为“时差”(Yamaguchi et al., 2013)。相反,在植物中,原生时钟在单个细胞水平上起作用,它们相互作用,在植物组织、器官和整个生物体中产生昼夜节律(Fukuda et al., 2007;2012)。植物的昼夜节律调节着基因表达的时间,例如光合作用基因在清晨至中午达到表达高峰,糖转运基因在傍晚至傍晚达到表达高峰,参与香味产生的基因在傍晚至清晨达到表达高峰(Harmer et al., 2000)。生物钟由三个组成部分组成:输入通路,将环境的明暗周期和其他外部刺激传递给内源性振荡器;内源性振荡器本身,其产生周期约为24小时的昼夜节律;输出通路,传递振荡器产生的节律来控制各种生理活动(Harmer, 2009)。大多数关于高等植物生物钟的分子遗传学研究都是在模式生物拟南芥中进行的(Mizoguchi et al., 2002;麦克朗,2006;伤害,2009;Pruneda-Paz and Kay, 2010)。其中一些研究已经证明了CCA1 (CIRCADIAN CLOCK ASSOCIATED 1)、TOC1 (CAB表达时序1)、PRRs(伪反应调节因子)和LHY (LATE ELONGATED HYPOCOTYL)等基因簇如何参与振荡器,以及这些“时钟基因”如何在昼夜节律的形成中发挥核心作用(Alabadí等人,2001;Nakamichi et al., 2004;2010;2012)。参与输入通路的蛋白质包括光敏色素和隐色素,它们分别是红色和蓝色光感受器(Pruneda-Paz和Kay, 2010)。已知参与输入通路的其他因素包括光促蛋白,它能够接受绿光和蓝光(Briggs和Christie, 2002),以及F-box蛋白ZEITLUPE,这是一种新的蓝光感光蛋白(Somers等人,2000;2004;Kim et al., 2007)。许多其他因素也参与了输出途径,如光合作用、呼吸、气孔打开/关闭、茎伸长、叶片打开、开花和其他各种高级植物功能的生物钟调节(Harmer等人,2000;Graf et al., 2010;Farre, 2012)。调控生理过程的关键因子
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来源期刊
Environmental Control in Biology
Environmental Control in Biology Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.00
自引率
0.00%
发文量
25
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