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Type: Artigo de periódico
Title: No -releasing Substances That Induce Growth Elongation In Maize Root Segments
Author: Snuza J.F.
Gouvea C.M.C.P.
Magalhaes A.C.N.
Martins I.S.
Abstract: Root segments of maize were incubated in different solutions containing, substances that non-enzimaticaly release nitric oxide (NO ). such as sodium nitrite (SNj, sodium ititroprusside (SNP), nitrosoglutathione (NOM') and niUosocysteine (NCYS). We found that all of those 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 NGI.U and 10-7 M SN, pH 7.0. NO scavenger such as méthylène blue prevented the elongation induced by NO -releasing substances, but had no effect on indole-3-acetic acid (lAA)-induced cell expansion. Vanadale. a plasmamembrane ATPase inhibitor, significantly reverted IAA induced elon gallon when supplied at 10-6 M concentration. IAA-induced elongation was strongly enhanced by 10 nM BAY K 8644, an agonist of voltage dependent Ca2+ channels. Promotion of root elongation in the absence of IAA occurred only at higher concentrations of BAY K. Vanadate and BAY K had no influence on the NCYS induced elongation. Our results suggest a role for NO as an elongation inducer of maize root cells and that IAA and NO releasing sub stances conceivably share. common steps in the signal transduction pathway, since both elicited the same plant response. The results also indicate that the common steps in the signalling of IAA and NCYS might not be at the level of the plasmarnembrane.
Rights: fechado
Identifier DOI: 
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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