Transgenic Soybean Overexpressing GmSAMT1 Exhibits Resistance to Multiple-HG Types of Soybean Cyst Nematode Heterodera Glycines

Overview

Journal Plant Biotechnol J

Specialties Biology
Biotechnology

Date 2016 Apr 12

PMID 27064027

Citations 11

Authors

Jingyu Lin

Mitra Mazarei

Nan Zhao

Catherine N Hatcher

Wegi A Wuddineh

Mary Rudis

Timothy J Tschaplinski

Vincent R Pantalone

Prakash R Arelli

Tarek Hewezi

Feng Chen

Charles Neal Stewart Jr

Affiliations

Soon will be listed here.

Abstract

Soybean (Glycine max (L.) Merr.) salicylic acid methyl transferase (GmSAMT1) catalyses the conversion of salicylic acid to methyl salicylate. Prior results showed that when GmSAMT1 was overexpressed in transgenic soybean hairy roots, resistance is conferred against soybean cyst nematode (SCN), Heterodera glycines Ichinohe. In this study, we produced transgenic soybean overexpressing GmSAMT1 and characterized their response to various SCN races. Transgenic plants conferred a significant reduction in the development of SCN HG type 1.2.5.7 (race 2), HG type 0 (race 3) and HG type 2.5.7 (race 5). Among transgenic lines, GmSAMT1 expression in roots was positively associated with SCN resistance. In some transgenic lines, there was a significant decrease in salicylic acid titer relative to control plants. No significant seed yield differences were observed between transgenics and control soybean plants grown in one greenhouse with 22 °C day/night temperature, whereas transgenic soybean had higher yield than controls grown a warmer greenhouse (27 °C day/23 °C night) temperature. In a 1-year field experiment in Knoxville, TN, there was no significant difference in seed yield between the transgenic and nontransgenic soybean under conditions with negligible SCN infection. We hypothesize that GmSAMT1 expression affects salicylic acid biosynthesis, which, in turn, attenuates SCN development, without negative consequences to soybean yield or other morphological traits. Thus, we conclude that GmSAMT1 overexpression confers broad resistance to multiple SCN races, which would be potentially applicable to commercial production.

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