| Abstract Detail
Photomorphogenesis Han, Yun-Jeong [1], Kim, Jeong-Il [2], Song, Pill-Soon [3]. Shade-Resistant Arabidopsis thaliana with Bathochromic Phytochromes A. Search for sunlight is critical for plant growth and development. Plants grown under shade/far-red light stresses such as dense canopies and packed neighbor plants experience a decrease in the ratio of red (R) to far-red (FR) light (R:FR ratio). Reduction of this ratio entails the plants to avoid the shade in search of photosynthetically actinic R light. The shade-avoidance reactions include a rapid increase in the extension growth of stems and petioles at the expense of leaf growth, storage organ production, and reproductive development. Phytochromes, the R/FR-perceiving photoreceptor, regulate the shade-avoidance reaction in response to the R:FR ratio or photoequilibrium between the R-light absorbing Pr and the FR-light absorbing Pfr forms. In FR light environments the photoequilibrium of phytochrome is shifted toward the Pr form that induces shade avoidance responses. We developed bathochromic mutant phytochromes A (phyA) whose Pr-absorbance band maximum shifted to longer wavelength by a few nanometers. The bathochromic shifts allow activation of phyA even at low R:FR ratios to suppress plants?shade avoidance phenotypes. The in vivo function of the phyA mutants and their shade resistance role have been demonstrated by using transgenic Arabidopsis thaliana plants. The shade-tolerant plants offer attractive biotechnological potentials in various shade-sensitive plants such as turf grass and crop plants.
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1 - Chonnam National University, Department of Molecular Biotechnology (BK21), Gwangju, 500, South Korea
2 - Chonnam National University, Department of Molecular Biotechnology, Gwangju, 500, South Korea
3 - Cheju National University, Faculty of Biotechnology, Cheju National University, 66 Jeju Daehak-Ro, Cheju, 690-756, South Korea
Keywords:
bathochromic
Phytochrome.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P31022
Abstract ID:2449 |
