Artículos de revistas
No·-releasing Substances That Induce Growth Elongation In Maize Root Segments
Registro en:
Plant Growth Regulation. , v. 21, n. 3, p. 183 - 187, 1997.
1676903
10.1023/A:1005837012203
2-s2.0-0030856461
Autor
Gouvea C.M.C.P.
Souza J.F.
Magalhaes A.C.N.
Martins I.S.
Institución
Resumen
Root segments of maize were incubated in different solutions containing substances that non-enzymatically release nitric oxide, such as sodium nitrite (SN), sodium nitroprusside (SNP), nitrosoglutathione (NGLU) and nitrosocysteine (NCYS). We found that all of these substances induced root tip expansion in a dose-dependent manner. The decreasing order of potency for root-induced elongation was: 10 -7 M SN, pH 4.5; 10 -11 M NCYS, 10 -10 M SNP, 10 -9 M NGLU and 10 -7 M SN, pH 7.0. Nitric oxide scavenger such as methylene blue prevented the elongation induced by NO·-releasing substances, but had no effect on indole-3-acetic acid (IAA)-induced cell expansion. Our results suggest that nitric oxide is the putative elongation inducer and that IAA and NO·-releasing substances conceivably share common steps in the signal transduction pathway, since both elicited the same plant response. 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