Biphasic Inhibition of Photosynthesis in Powdery Mildewed Barley 1
AUTOR(ES)
Edwards, H. H.
RESUMO
A careful restudy of the photosynthetic process of barley (Hordeum vulgare) infected with powdery mildew (Erysiphe graminis f. sp. hordei) is reported. Unlike previous reports, which indicated a stimulation in infected host tissue photosynthesis during early stages of the disease followed by a rapid decline in activity, this study observed no stimulation but instead a biphasic inhibition in infected host photosynthesis under physiological concentrations of CO2. Under high CO2 (1.0%) a stimulation was observed during early stages of infection. The inhibition in low CO2 and stimulation in high CO2 of infected host photosynthesis was shown to occur in healthy host tissue when in the presence of 10−2m α-hydroxy-2-pyridinemethanesulfonic acid. The possible significance of these similar results is discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=396468Documentos Relacionados
- Translocation of Carbon in Powdery Mildewed Barley 1
- Induction of Disease Symptoms in Barley by Powdery Mildew 12
- Zinc-inhibited Electron Transport of Photosynthesis in Isolated Barley Chloroplasts 1
- Effect of Powdery Mildew Infection on Photosynthesis by Leaves and Chloroplasts of Sugar Beets 1
- Ectopic Expression of Constitutively Activated RACB in Barley Enhances Susceptibility to Powdery Mildew and Abiotic Stress1
