Depression by inbreeding after four sucessive self-pollination squash generations
DOI:
https://doi.org/10.1590/S0103-90162004000200016Keywords:
Cucurbita moschata, cucurbits, selfingAbstract
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).Downloads
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Published
2004-04-01
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Depression by inbreeding after four sucessive self-pollination squash generations . (2004). Scientia Agricola, 61(2), 224-227. https://doi.org/10.1590/S0103-90162004000200016