Horticultura Brasileira (2002) 20, 86-89

Roberto Alexandre Costa, Rosana Rodrigues and Cláudia Pombo Sudré (2002)
Resistência genética à mancha-bacteriana em genótipos de pimentão
[Genetic resistance to bacterial leaf spot on sweet pepper genotypes]
Horticultura Brasileira 20 (1), 86-89
Abstract: Bacterial leaf spot (BLS) is the most important bacterial disease in sweet pepper, causing intense defoliation under favorable conditions, leaving the exposed fruits to sunburn and decreasing the yield. To estimate genetic effects of the reaction to BLS on leaves and fruits, under the conditions of Campos dos Goytacazes (Brazil), hybrids F₁, without reciprocals, were obtained from diallel crosses among five pepper genotypes, three susceptible ('UENF 1420 ', 'UENF 1421 ' and 'UENF 1422 ') and two resistant ('UENF 1381 ' and 'UENF 1382 '). Leaves were inoculated by infiltrating the mesophyll with 10³ cells/ml, adjusted with spectrophotometer. Variety and mean heterosis were significant for resistance on leaves, indicating that additive and dominant effects are involved in the genetic control of this character. For resistance in fruits, only variety effects were significant, indicating the presence of additive effects in the control of this characteristic. Based on these analyses, the genotypes 'UENF 1381 ' and 'UENF 1382 ' were selected for resistance to BLS on leaves. For resistance to BLS on fruits, 'UENF 1381' and 'UENF 1421' were the best genotypes. The best hybrids for resistance to BLS on leaves were: 'UENF 1420' x 'UENF 1421', 'UENF 1382' x 'UENF 1420', 'UENF 1381' x 'UENF 1420', 'UENF 1381' x 'UENF 1421', 'UENF 1381' x 'UENF 1422' and 'UENF 1381' x 'UENF 1382'.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Rosana Rodrigues

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas campestris pv. vesicatoria	Green pepper/chilli (Capsicum)	Brazil (south)