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Brassinolide interacts with auxin and ethylene in the root gravitropic response of maize ( Zea mays )
Author(s) -
Chang Soo Chul,
Kim YoungSoo,
Lee Jin Young,
Kaufman Peter B.,
Kirakosyan Ara,
Yun Hye Sup,
Kim TaeWuk,
Kim Soon Young,
Cho Myeon Haeng,
Lee June Seung,
Kim SeongKi
Publication year - 2004
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.0031-9317.2004.00356.x
Subject(s) - gravitropism , zea mays , ethylene , auxin , brassinolide , etiolation , biophysics , chemistry , biology , arabidopsis , botany , biochemistry , agronomy , enzyme , plant growth , mutant , gene , catalysis
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.