Induction of Stomatal Closure by Helminthosporium maydis Pathotoxin
Year: 1973
Type: article
Abstract: Helminthosporium maydis pathotoxin caused a rapid inhibition of photosynthesis in whole leaves of maize having Texas male-sterile cytoplasm but not in leaves having normal cytoplasm. Electron transport, phosphorylation, and proton uptake activities of isolated chloroplast lamellae, from either normal or Texas male-sterile cytoplasm leaves, were unaffected by addition of toxin to the reaction mixture. The toxin was found to have a direct effect on stomatal functioning. Rates of transpiration were inhibited in treated leaves at times slightly preceding the observed effects on photosynthesis. In studies with isolated epidermal peels from Texas male-sterile cytoplasm maize leaves, the toxin inhibited light-induced K(+) uptake by guard cells. All effects of the toxin on Texas male-sterile cytoplasm maize tissues were found to be similar to the mode of action of abscisic acid.
Source: PLANT PHYSIOLOGY
DOI: 10.1104/pp.52.6.569
Authors: C. J. Arntzen, M. F. Haugh, S. Bobick
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W1970770798