Performance of advanced generation from a hybrid Japanese cucumber

Victoria Rossmary Santacruz Oviedo,Antonio Ismael Inácio Cardoso,Amanda Regina Godoy

doi:10.1590/s0103-90162008000500016

Victoria Rossmary Santacruz Oviedo, Antonio Ismael Inácio Cardoso + Show 1 more

Open Access

https://doi.org/10.1590/s0103-90162008000500016

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Abstract

Inbreeding reduces the vigor in plants as a result of a decrease in the proportion of heterozygous loci. However, the influence of inbreeding is different among the species. The objective of this work was to evaluate the inbreeding depression in a cucumber Japanese population. An F2 population was obtained from a commercial hybrid (Natsu suzumi), which was considered as S0 population. S1, S2, S3, S4 and S5 progenies were obtained by the 'Single Seed Descent' methodology. A complete blocks design with seven treatments (different generations of self pollination - S0 to S5 and the hybrid Natsu suzumi), and six replications of five plants per plot was used in protected cultivation from Aug. 21 to Nov. 29, 2002. Number of leaves, length of the main stem, number and weight of fruits (total and commercial) number of nodes and vines percentage were evaluated. For most of the traits appraised differences were not observed among populations showing that there was no loss of vigor due to inbreeding in this population.

Highlights

Inbreeding reduces the vigor in plants as a result of a decrease in the proportion of heterozygous loci
The inbreeding depression is a consequence of an increase of the homozygous, its magnitude depends on number and types of deleterious genes, exposed to conditions of homozygosis (Charlesworth & Charlesworth, 1979)
The objective of this study was to evaluate the possible existence of inbreeding depression in a Japanese cucumber population

Summary

Introduction

Inbreeding reduces the vigor in plants as a result of a decrease in the proportion of heterozygous loci (Hayes et al, 2004). The inbreeding depression is a consequence of an increase of the homozygous, its magnitude depends on number and types of deleterious genes, exposed to conditions of homozygosis (Charlesworth & Charlesworth, 1979). The influence of inbreeding is thoroughly different among species Most of the superior plants, mainly cross-pollinated, show a depression in larger or smaller degree as a consequence of the inbreeding. Cucurbits are cross-pollinated, but they are examples of species in which some lines seem to lose little vigor due to inbreeding (Allard, 1978; Withaker & Robinson, 1986)

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