Photosynthetica 2001, 39(4):603-606 | DOI: 10.1023/A:1015620532467

Effects of Angular Leaf Spot and Rust on Leaf Gas Exchange and Yield of Common Bean (Phaseolus Vulgaris)

W.C. Jesus Junior, F.X.R. Vale, C.A. Martinez, R.R. Coelho, L.C. Costa, B. Hau, L. Zambolim

Isolated and interactive effects of angular leaf spot (caused by Phaeoisariopsis griseola) and rust (caused by Uromyces appendiculatus) on leaf gas exchange and yield was studied in common bean (Phaseolus vulgaris L. cv. Carioca) plants. Gas exchange was measured on 37, 44, 51, and 58 d after planting using a portable photosynthesis system. The inoculation of plants with P. griseola (P), U. appendiculatus (U), and the combination of both pathogens (P+U) caused a significant reduction of net photosynthetic rate (PN) and yield. The reduction of stomatal conductance (gs), PN, and yield was higher under P and combination of P+U than under U treatment. By effect of U, the reduction on yield was higher than the reductions on gas exchange parameters. On the treatment P+U, a reduction of 23 % in PN and a correspondent reduction of 32 % in yield was observed. The interactive effects of the pathogens on yield could be explained in part by the decreases in gs and in PN of diseased bean leaves. The combined effect of both diseases on yield and gas exchange parameters suggests an antagonistic interaction.

Additional key words: healthy leaf area index; Phaeoisariopsis griseola; photosynthesis; stomatal conductance; Uromyces appendiculatus; water use efficiency

Published: December 1, 2001  Show citation

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Jesus Junior, W.C., Vale, F.X.R., Martinez, C.A., Coelho, R.R., Costa, L.C., Hau, B., & Zambolim, L. (2001). Effects of Angular Leaf Spot and Rust on Leaf Gas Exchange and Yield of Common Bean (Phaseolus Vulgaris). Photosynthetica, 39(4), 603-606. doi: 10.1023/A:1015620532467
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