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| Main Author: | |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidade Estadual de Maringá
2017
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| Online Access: | https://www.redalyc.org/articulo.oa?id=303049607003 https://www.redalyc.org/journal/3030/303049607003/ https://www.redalyc.org/journal/3030/303049607003/html/ https://www.redalyc.org/journal/3030/303049607003/303049607003.epub https://www.redalyc.org/journal/3030/303049607003/movil |
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Table of Contents:
- Older leaf tissues in younger plants are more susceptible to soybean rust Sheila Ariana Xavier Daiane Cristina Martins Lucas Henrique Fantin Marcelo Giovanetti Canteri Agrociencias phenological stage age of trifoliates Phakopsora pachyrhizi The aim of this study was to clarify the relationship between soybean leaf/plant age and the susceptibility to infection by Phakopsora pachyrhizi. Two studies were conducted in the greenhouse during the 2009/2010 season using the BRS 232 cultivar. The experimental design for Study 1 was fully randomized in a 2 x 3 factorial arrangement (phenological stage x age of the 4th, 5th and 6th trifoliate at the time of inoculation), and in Study 2, the experimental design was fully randomized with five treatments (T) and four replicates. The variables assessed were disease severity, number of lesions, uredinia per lesion, and viable spores. In Study 1, it was observed that disease severity was lower when the plant was in the growth stage V6 (11.4%), compared to the reproductive stage R4 (16.9%). The regression for disease severity and leaf age at the time of inoculation showed that older trifoliates on the plants in the reproductive stage exhibited higher severity. However, in Study 2, for trifoliates of the same age on plants of different ages, the trifoliates of younger plants were more susceptible to the disease. It was concluded that soybean plant susceptibility to soybean rust was directly proportional to the age of the trifoliate on a given plant and the phenological stage of the plant at the time of inoculation. 2017 artículo científico 1679-9275 https://www.redalyc.org/articulo.oa?id=303049607003 https://www.redalyc.org/journal/3030/303049607003/ https://www.redalyc.org/journal/3030/303049607003/html/ https://www.redalyc.org/journal/3030/303049607003/303049607003.epub https://www.redalyc.org/journal/3030/303049607003/movil en http://www.redalyc.org/revista.oa?id=3030 Acta Scientiarum. Agronomy application/pdf Universidade Estadual de Maringá Acta Scientiarum. Agronomy (Brasil) Num.1 Vol.39