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Enhanced Exudation of DIMBOA and MBOA by Wheat Seedlings Alone and in Proximity to Wild Oat (Avena fatua) and Flixweed (Descurainia sophia)

Published online by Cambridge University Press:  20 January 2017

C. H. Lu ,
X. G. Liu ,
J. Xu ,
F. S. Dong ,
C. P. Zhang ,
Y. Y. Tian  and
Y. Q. Zheng
C. H. Lu
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
X. G. Liu
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
J. Xu
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
F. S. Dong
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
C. P. Zhang
Affiliation:
State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Quality and Standard for Agricultural Products, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, P. R. China
Y. Y. Tian
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Y. Q. Zheng*
Affiliation:
Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
*
Corresponding author's E-mail: yongquan_zheng@yahoo.com.cn
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Abstract

The allelochemicals 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) and 6-methoxy-benzoxazolin-2-one (MBOA) in wheat are considered to have a role in plant defense against weeds. This study explored the effect of proximity to two weeds, wild oat and flixweed, on DIMBOA/MBOA production in wheat seedlings under hydroponic culture to identify whether the breeding of modern wheat varieties with higher concentrations of these compounds could ensure plant-mediated weed control. MBOA was detected and was noted to exert a significant response; its exudation by some wheat seedlings was significantly increased irrespective of whether the roots were in contact with or separate from those of the weeds. The weeds were a source of biotic stress to wheat when grown in proximity to it, and the stress resulted in production of higher levels of MBOA in wheat seedlings, although the concentration varied with the wheat cultivar. Therefore, the synthesis and exudation of DIMBOA/MBOA in wheat seedlings appears to be an active metabolic process influenced by the environment, particularly the presence of weeds.

Keywords

Flixweed, Descurainia sophia (L.) Webb. ex Prantlwild oat, Avena fatua Lwheat (Triticum aestivum L.)DIMBOA/MBOAenhanced exudationwheat seedlingrootweed
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 60 , Issue 3 , September 2012 , pp. 360 - 365
Copyright
Copyright © Weed Science Society of America 

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