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Overexpression of arabidopsis YUCCA6 in potato results in high-auxin developmental phenotypes and enhance
Authors
Dongwon Baek
Hans J. Bohnert
+13 more
Ray A. Bressan
Joon Yung Cha
Hyun Jin Chun
Woo Sik Chung
Jeong Im Kim
Min Chul Kim
Woe Yeon Kim
Min Kyung Lee
Sang Yeol Lee
Shin Woo Lee
Dong Ha Oh
Hyeong Cheol Park
Dae Jin Yun
Publication date
1 January 2013
Publisher
LSU Digital Commons
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Abstract
Indole-3-acetic acid (IAA), a major plant auxin, is produced in both tryptophan-dependent and tryptophanindependent pathways. A major pathway in Arabidopsis thaliana generates IAA in two reactions from tryptophan. Step one converts tryptophan to indole-3-pyruvic acid (IPA) by tryptophan aminotransferases followed by a rate-limiting step converting IPA to IAA catalyzed by YUCCA proteins. We identified eight putative StYUC (Solanum tuberosum YUCCA) genes whose deduced amino acid sequences share 50%-70% identity with those of Arabidopsis YUCCA proteins. All include canonical, conserved YUCCA sequences: FATGY motif, FMO signature sequence, and FAD-binding and NADPbinding sequences. In addition, five genes were found with ~50% amino acid sequence identity to Arabidopsis tryptophan aminotransferases. Transgenic potato (Solanum tuberosum cv. Jowon) constitutively overexpressing Arabidopsis AtYUC6 displayed high-auxin phenotypes such as narrow downward-curled leaves, increased height, erect stature, and longevity. Transgenic potato plants overexpressing AtYUC6 showed enhanced drought tolerance based on reduced water loss. The phenotype was correlated with reduced levels of reactive oxygen species in leaves. The results suggest a functional YUCCA pathway of auxin biosynthesis in potato that may be exploited to alter plant responses to the environment. © 2012 The Author
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Last time updated on 26/10/2023