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Document Type:Latin Dissertation
Language of Document:English
Record Number:52406
Doc. No:TL22360
Call number:‭1455933‬
Main Entry:Angela M. Linares Ramirez
Title & Author:Response to phenotypic recurrent selection for resistance to Diaphania hyalinata (L.) (Lepidoptera: Pyralidae) in tropical pumpkin (Cucurbita moschata Duchesne)Angela M. Linares Ramirez
College:University of Puerto Rico, Mayaguez (Puerto Rico)
Date:2008
Degree:M.S.
student score:2008
Page No:67
Abstract:In order to determine the effectiveness of phenotypic recurrent selection for resistance to melonworm, two cycles of selection were carried out on Cucurbita moschata ‘Taína Dorada’. Selection was based on results of a laboratory detached leaf test followed by a field evaluation. Three experiments were then conducted in two locations, Lajas and Isabela, during July to November 2007 to compare the base population (‘Taína Dorada’ [TD] Cycle 0) and the two cycles of selection (TD-Cycle 1 and TD-Cycle 2). In addition, the experiments included two commercial genotypes (‘Soler’ and ‘Verde Luz’) and two experimental genotypes (‘Nigerian Local’ and PR-MWR1). The materials were evaluated for foliar damage, number of eggs and larvae, and yield. The effect of phenotypic recurrent selection for resistance was not as great as anticipated at the start of this research. A slight reduction was observed in numbers of eggs and larvae after two cycles of selection. Two cycles of selection for resistance had no effect on yield and average fruit weight. High variances were observed for number of eggs and larvae. As a consequence, for future cycles of selection more replications (plots) and/or samples (number of leaves per plant) are necessary to find differences between genotypes and carry out effective selection. Some modifications of selection procedures may be needed to decrease sampling and experimental errors.
Subject:Biological sciences; Agronomy; Plant pathology; 0480:Plant pathology; 0285:Agronomy
Added Entry:L. Wessel-Beaver
Added Entry:University of Puerto Rico, Mayaguez (Puerto Rico)