| Full text | |
| Author(s): |
Antonio Ismael Inácio Cardoso
[1]
Total Authors: 1
|
| Affiliation: | [1] UNESP/FCA. Depto. de Produção Vegetal - Brasil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Scientia Agricola; v. 61, n. 2, p. 224-227, 2004-04-00. |
| Abstract | |
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). (AU) | |