منابع مشابه
Hormonal Regulation in Shade Avoidance
At high vegetation density, shade-intolerant plants sense a reduction in the red (660 nm) to far-red (730 nm) light ratio (R/FR) in addition to a general reduction in light intensity. These light signals trigger a spectrum of morphological changes manifested by growth of stem-like tissue (hypocotyl, petiole, etc.) instead of harvestable organs (leaves, fruits, seeds, etc.)-namely, shade avoidan...
متن کاملThe Adaptive Evolution of Plasticity: Phytochrome-Mediated Shade Avoidance Responses1
SYNOPSIS. Many plants display a characteristic suite of developmental ‘‘shade avoidance’’ responses, such as stem elongation and accelerated reproduction, to the low ratio of red to far-red wavelengths (R:FR) reflected or transmitted from green vegetation. This R:FR cue of crowding and vegetation shade is perceived by the phytochrome family of photoreceptors. Phytochrome-mediated responses prov...
متن کاملYUCCA auxin biosynthetic genes are required for Arabidopsis shade avoidance
Plants respond to neighbor shade by increasing stem and petiole elongation. Shade, sensed by phytochrome photoreceptors, causes stabilization of PHYTOCHROME INTERACTING FACTOR proteins and subsequent induction of YUCCA auxin biosynthetic genes. To investigate the role of YUCCA genes in phytochrome-mediated elongation, we examined auxin signaling kinetics after an end-of-day far-red (EOD-FR) lig...
متن کاملShade avoidance responses. Driving auxin along lateral routes.
To grow and develop optimally, all organisms need to perceive and process information from their environment. As sessile organisms, plants need to sense and respond to external stimuli more than most organisms. Therefore, plants have to adapt their developmental pattern to the environmental changes to ensure survival and reproduction. As a consequence, numerous environmental factors, including ...
متن کاملReproductive efficiency and shade avoidance plasticity under simulated competition
Plant strategy and life-history theories make different predictions about reproductive efficiency under competition. While strategy theory suggests under intense competition iteroparous perennial plants delay reproduction and semelparous annuals reproduce quickly, life-history theory predicts both annual and perennial plants increase resource allocation to reproduction under intense competition...
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ژورنال
عنوان ژورنال: The Arabidopsis Book
سال: 2012
ISSN: 1543-8120
DOI: 10.1199/tab.0157