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Scientia Agricola

versão On-line ISSN 1678-992X

Resumo

CARDOSO, Antonio Ismael Inácio. Depression by inbreeding after four sucessive self-pollination squash generations. Sci. agric. (Piracicaba, Braz.) [online]. 2004, vol.61, n.2, pp.224-227. ISSN 1678-992X.  http://dx.doi.org/10.1590/S0103-90162004000200016.

The strategy for breeding F1 hybrid squash is to develop parental lines through self-pollination. However, it increases plant mean homozygosis, which is not the natural genetic state of a cross-pollinated species, and can cause "inbreeding depression". The objective of this work was to evaluate this depression with sucessive generations of self-pollination (without selection) in Cucurbita moschata, cv. Piramoita. Populations were obtained from lines with one to four generations of self-pollination (obtained by the SSD method), from the original cv. Piramoita (population S0). Randomized blocks were used with five treatments (different generations of self-pollination - S0 to S4), six replicates and five plants per plot. Regression analysis was made by the Wright inbreeding coefficient (F) to measure the homozygosis level effect on vigor loss. There was a linear reduction of mean weight and fruit length, seed production (number and weight) per fruit with the increase of the homozygosis level; however inbreeding did not affect seed quality (weight of 100 seeds and germination).

Palavras-chave : Cucurbita moschata; cucurbits; selfing.

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