02135naa a2200229 a 450000100080000000500110000800800410001902400380006010000200009824501060011826000090022452014290023365000220166265300340168470000210171870000140173970000200175370000200177370000200179370000220181377300700183521188172021-04-22       2011    bl uuuu     u00u1 u    #d7 a10.1080/07060661.2010.5348952DOI1 aLOPES, M. T. G.  aProgeny evaluation for resistance to Phaeosphaeria leaf spot intropical maize.h[electronic resource]  c2011  aMaize breeding programmes in Brazil and elsewhere seek reliable methods to identify genotypes resistant toPhaeosphaerialeafspot. The area under the disease progress curve (AUDPC) is an accurate method to evaluate the severity of foliar diseases. However, at leastthree data points are required to calculate the AUDPC, which is unfeasible when there are thousands of genotypes to be assessed. The aim ofthis work was to estimate the heritability of disease resistance, evaluate disease severity at different times using a nine-point scale incomparison to the AUDPC, and establish the most suitable phenological period for disease assessment. A repeated experiment was conductedin a 11×11 lattice experimental design with three replications. Disease assessments were carried out at flowering, 15 and 30 dayspost-anthesis for the parental lines DS95, DAS21, the F1generation and 118 F2:3progenies. Then, the AUDPC was obtained and resultscompared with the single-point evaluations used to calculate it. Individual and joint analyses of variance were conducted to obtain heritabiliyestimates. The assessments performed after the flowering stage gave higher estimates of heritability and correlation with AUDPC. Weconcluded that one assessment between the 15th and 30th day after flowering could provide enough information to distinguish maize genotypes for their resistance to Phaeosphaeria leaf spot under tropical conditions.  aDoença de Planta  aDisease resistance evaluation1 aVIEIRA, M. L. C.1 aLOPES, R.1 aBRUNELLI, K. R.1 aMATIELLO, R. R.1 aSILVA, H. P. da1 aCAMARGO, L. E. A.  tCanadian Journal of Plant Pathologygv. 33, n. 1, p. 49-53, 2011.