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Role of auxinic herbicide‐induced ethylene on hypocotyl elongation and root/hypocotyl radial expansion
Author(s) -
Wei Yang Dou,
Zheng HongGang,
Hall J Christopher
Publication year - 2000
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/(sici)1526-4998(200005)56:5<377::aid-ps154>3.0.co;2-m
Subject(s) - auxin , hypocotyl , arabidopsis thaliana , biology , arabidopsis , botany , mutant , ethylene , wild type , elongation , microbiology and biotechnology , chemistry , biochemistry , gene , materials science , ultimate tensile strength , metallurgy , catalysis
Effects of auxinic herbicides on growth/development, ethylene biosynthesis and gene expression were studied in Sinapis arvensis as well as wild type, auxin‐resistant and ethylene‐insensitive lines of Arabidopsis thaliana . Expansion of the radius of the root/hypocotyl and inhibition of root and hypocotyl elongation were observed in seedlings of S arvensis and wild‐type A thaliana treated with the auxinic herbicide 2,4‐D. All of these morphological changes, except for inhibition of root elongation, are caused by auxinic herbicide‐induced ethylene biosynthesis, which is caused by transcriptional activation of auxin‐inducible genes encoding 1‐aminocyclopropane‐1‐carboxylic acid synthase (ACS). We are the first to distinguish that two types of signal/mechanism exist; the first results from auxinic herbicide‐induced ethylene while the second mechanism is not mediated by ethylene. We identified and characterized seven members of ACS gene family in wild mustard and studied the auxin‐induced expression of these genes. The significance of these findings in understanding the molecular basis for the morphological changes associated with auxinic herbicide action is discussed. © 2000 Society of Chemical Industry