Study on Light Qualities and Photoreceptors Involved in the Induction of Root Waving in Rice Seedlings
Date Issued
2015
Date
2015
Author(s)
Shao, Ko-Shuan
Abstract
Light is not only the energy source for plants, but also an environmental signal to modulate plant morphogenesis. Our previous research showed that TCN1 (Oryza sativa L. cv. Taichung Native 1; an indica-type rice variety) displayed a wavy root phenotype under light conditions, but TNG67 (Oryza sativa L. cv. Tainung 67; a japonica-type rice variety) displayed a straight root phenotype. Moreover, nitric oxide, oxylipins, ethylene, and auxin were sequentially involved in the signaling cascades of light-induced root waving. In this study, we tried to clarify the mechanism leading to varietally dissimilar seminal root photomorphogenesis. Our results showed that TCN1 was more sensitive to light stimulus and following downstream signaling molecules. Moreover, the levels of light-induced inhihibition of root elongation, gene expression of OsHY5, and biosynthesis of signaling molecules in TCN1 could be higher than those in TNG67. In addition, the gene expression patterns of some photoreceptors (OsPHYs, OsPHOT1a, OsPHOT1b) were correlated to the root phenotypes between varieties under light or dark condition. The effects of the specific wavelength of light on root waving induction were also identified. The results showed that root waving can be induced by red-green-blue and green-blue light. The gene expression patterns of OsPHOT1a and OsPHOT1b were correlated to the root phenotypes under different light qualities. For evaluation of environmental significance of different root morphogenesis; however, it was found that TCN1 seedlings under light or dark conditions performed same anchorage strength. On the other hand, TNG67 seedlings under light condition performed weaker anchorage strength than under dark condition.
Subjects
light
rice (Oryza sativa L.)
root waving
variety difference
photoreceptor
light quality
anchorage
Type
thesis
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