Light quality regulation of endogenous levels of auxin,abscisic acid and ethylene production in petioles and leaves of wild type and ACC deaminase transgenic Brassica napus seedlings |
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Authors: | Leonid V. Kurepin Saleh Shah David M. Reid |
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Affiliation: | (1) Department of Biological Sciences, University of Calgary, University Drive 2500 NW, Calgary, AB, Canada, T2N 1N4;(2) Alberta Research Council, Vegreville, AB, Canada |
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Abstract: | Brassica napus L. seedlings responded to low red to far-red (R/FR) ratio by elongating petioles and decreasing leaf expansion. These typical shade avoidance traits were correlated with significantly decreased endogenous indole-3-acetic acid (IAA) levels and significantly increased endogenous abscisic acid (ABA) levels and ethylene production. The transgenic (T) B. napus line bearing the bacterial ACC deaminase gene, did not respond to low R/FR ratio with altered petiole and leaf growth and less ethylene (especially by petioles) was produced. As with WT seedlings, T seedlings had significantly lower IAA levels in both petioles and leaves under low R/FR ratio. However, ABA levels of low R/FR ratio-grown T seedlings either increased (petioles) or were unaltered (leaves). Our results further suggest that low R/FR ratio regulates endogenous IAA levels independently of ethylene, but there may be an interaction between ABA and ethylene in leaf development. |
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Keywords: | Light quality Petiole Leaf Auxin Abscisic acid Ethylene |
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