نتایج جستجو برای: etiolation
تعداد نتایج: 243 فیلتر نتایج به سال:
Light is the ultimate energy source for all living organisms and is utilized primarily through photosynthesis by green plants. However there is a separate requirement of plants to be illuminated in which light acts not as an energy source but as an environmental trigger of developmental processes. This decisive role of light in controlling the growth of plants is described by the term "photomor...
Single, double, and triple null combinations of Arabidopsis mutants lacking the photoreceptors phytochrome (phy) A (phyA-201), phyB (phyB-5), and cryptochrome (cry) 1 (hy4-2.23n) were examined for de-etiolation responses in high-fluence red, far-red, blue, and broad-spectrum white light. Cotyledon unhooking, unfolding, and expansion, hypocotyl growth, and the accumulation of chlorophylls and an...
Evidence has been presented that a negative transcriptional feedback loop formed by the genes CIRCADIAN CLOCK ASSOCIATED (CCA1), LATE ELONGATED HYPOCOTYL (LHY) and TIMING OF CAB (TOC1) constitutes the core of the central oscillator of the circadian clock in Arabidopsis. Here we show that these genes are expressed at constant, basal levels in dark-grown seedlings. Transfer to constant red light ...
Intercropped systems with Conilon coffee might provide a better environment for production. The aim of this study was to assess the microclimate and development intercropped papaya trees. Papaya planted spacing 3.20 x 2.40 m. trees were after eight months, 1.60 m, in-between (in same row). measurements taken 0, 40 80 cm away from plants, both in north south direction. Concomitantly, an adjoinin...
In many plants, photomorphogenesis is the default developmental program after seed germination, and provides the key features that allow adaptation to light. This program is actively repressed if germination occurs in the absence of light, through a mechanism dependent on the E3 ubiquitin ligase activity that is encoded in Arabidopsis by COP1 (CONSTITUTIVE PHOTOMORPHOGENIC 1), which induces pro...
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