Overexpression of jasmonic acid carboxyl methyltransferase increases tuber yield and size in transgenic potato |
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Authors: | Hwang Bae Sohn Han Yong Lee Ju Seok Seo Choonkyun Jung Jae Heung Jeon Jeong-Han Kim Yin Won Lee Jong Seob Lee Jong-Joo Cheong Yang Do Choi |
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Institution: | (1) Department of Agricultural Biotechnology and Center for Agricultural Biomaterials, Seoul National University, Seoul, 151-921, Korea;(2) Plant Cell Biotechnology Lab, Korea Research Institute of Bioscience and Biotechnology, Daejon, 305-806, Korea;(3) School of Biological Sciences, Seoul National University, Seoul, 151-921, Korea |
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Abstract: | Jasmonates control diverse plant developmental processes, such as seed germination, flower, fruit and seed development, senescence
and tuberization in potato. To understand the role of methyl jasmonate (MeJA) in potato tuberization, the Arabidopsis
JMT gene encoding jasmonic acid carboxyl methyltransferase was constitutively overexpressed in transgenic potato plants. Increases
in tuber yield and size as well as in vitro tuberization frequency were observed in transgenic plants. These were correlated
with JMT mRNA level––the higher expression level, the higher the tuber yield and size. The levels of jasmonic acid (JA), MeJA and
tuberonic acid (TA) were also higher than those in control plants. Transgenic plants also exhibited higher expression of jasmonate-responsive
genes such as those for allene oxide cyclase (AOC) and proteinase inhibitor II (PINII). These results indicate that JMT overexpression induces jasmonate biosynthesis genes and thus JA and TA pools in transgenic potatoes. This results in enhanced
tuber yield and size in transgenic potato plants. |
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