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Brassinolide interacts with auxin and ethylene in the root gravitropic response of maize (Zea mays)

Title
Brassinolide interacts with auxin and ethylene in the root gravitropic response of maize (Zea mays)
Authors
Soo C.C.Kim Y.-S.Jin Y.L.Kaufman P.B.Kirakosyan A.Hye S.Y.Kim T.-W.Soon Y.K.Myeon H.C.June S.L.Kim S.-K.
Ewha Authors
이준승
SCOPUS Author ID
이준승scopusscopus
Issue Date
2004
Journal Title
Physiologia Plantarum
ISSN
0031-9317JCR Link
Citation
vol. 121, no. 4, pp. 666 - 673
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This study examines how brassinolide (BL) and ethylene interact in the gravitropic response mechanism of maize (Zea mays) primary roots. When applied exogenously, ethylene increases the rate of gravitropic curvature in a dose-dependent manner. This effect of ethylene was confirmed by the fact that AVG, a specific action inhibitor of ACC synthase, reduces the gravitropic curvature in the presence and absence of BL. Since AVG did not inhibit BL-increased gravitropic curvature completely, we investigated the possibility that BL may act on the gravitropic response by ways other than simply through enhanced ethylene production. We show that BL exhibits some of its stimulatory effect in the absence of ethylene. In addition, BL reduces the presentation time and lag period for the gravitropic response, whereas ethylene increases them. One possible mechanism of such action is that BL affects protein kinase activity, since the protein kinase inhibitors, staurosporine and H89, reduce BL-increased gravitropic curvature. In summary, BL is involved in the gravitropic response in maize primary roots via ethylene production, but it acts in a way that differs somewhat from that of ethylene.
DOI
10.1111/j.0031-9317.2004.00356.x
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
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