Identification of sources of resistance in sorghum to Peronosclerospora sorghi.
Identification of sources of resistance in sorghum to Peronosclerospora sorghi.
Author(s): BARBOSA, F. C. R.; CASELA, C. R.; PFENNING, L. H.; SANTOS, F. G.
Summary: Este trabalho foi realizado com o objetivo de se identificar fontes de resistência ao míldio do sorgo (Sorghum bicolor), causado pelo patógeno Peronosclerospora sorghi, pela avaliação de 42 genótipos de sorgo sob condições de infecção natural. Os genótipos foram semeados em parcelas de uma fileira, entre duas fileiras da cultivar suscetível SC283, semeada com 30 dias de antecedência para atuar como fonte de inóculo. Foram conduzidos dois ensaios no delineamento experimental de blocos ao acaso com três repetições. Os genótipos CMSXS156, CMSXS157, CMSXS243, TxARG-1, 8902, 9902054, 9910032, 9910296, Tx430, QL-3, SC170-6-17, CMSXS762 e BR304 foram classificados como altamente resistente nos dois ensaios. Entre estes as linhagens SC170-6-17 e 9910296 apresentam-se 0% de infecção sistêmica. Os resultados indicaram a provável ocorrência de diferentes patótipos de P. sorghi nos dois ensaios. The main objective of this work was to identify sources of resistance in sorghum (Sorghum bicolor) to Peronosclerospora sorghi, the causal agent of downy mildew, through the evaluation of 42 sorghum genotypes under natural infection in the field. Genotypes were planted in single row plots between two rows of the susceptible line SC283, planted 30 days before, to act as spreader rows, in two separate nurseries. The experimental design was a completely randomized block design with three replications. Sorghum genotypes CMSXS156, CMSXS157, CMSXS243, TxARG-1, 8902, 9902054, 9910032, 9910296, Tx430, QL-3, SC170-6-17, CMSXS762 and BR304 were classified as highly resistant in both nurseries. Among these, SC170-6-17 and 9910296 showed 0% systemic infection. Results indicated the possible occurrence of different pathotypes of P. sorghi in the two nurseries.
Publication year: 2005
Types of publication: Journal article
Unit: Embrapa Maize & Sorghum
Keywords: Diseases, Doenças, Míldio, Resistência Genética, Sorghum Bicolor, downy mildew, genetic resistance
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