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| Author(s): |
Renato Beozzo Bassanezi
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2000-03-10 |
| Advisor: | Lilian Amorim |
| Abstract | |
The effect of bean rust, angular leaf spot and anthracnose on physiological processes related to the photosynthesis of cultivars Rosinha G-2 and Carioca Comum was observed in several experiments under controlled environment and field conditions. Initially, the changes caused by these diseases on photosynthesis, respiration, transpiration, stomatal conductance, and variables related to the chlorophyll α fluorescence of infected leaves were measured during the disease development at different temperatures and two common bean cultivars under controlled environment conditions. Afterwards, the factors responsible for the reduction of net photosynthetic rate in the diseased leaves were determined by the analysis of the response curves of CO2 assimilation rate versus CO2</small intercellular concentration (A/Ci). Photosynthesis decreased and respiration increased following the appearance of disease symptoms. Both transpiration and stomatal conductance decreased with the increasing severities of angular leaf spot and anthracnose. Transpiration and stomatal conductance did not change in leaves with rust. The net photosynthetic rate of bean leaves with rust, angular leaf spot and anthracnose. Transpiration and stomatal conductance did not change in leaves with rust. The net photosynthetic rate of bean leaves with rust, angular leaf spot (AU) | |