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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/5322
Title: 
Depression by inbreeding after four sucessive self-pollination squash generations
Author(s): 
Cardoso, AII
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
0103-9016
Abstract: 
The strategy for breeding F-1 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 SO). Randomized blocks were used with five treatments (different generations of self-pollination -S-0 to S-4), 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).
Issue Date: 
1-Mar-2004
Citation: 
Scientia Agricola. Piracicaba: Univ Sao Paolo, v. 61, n. 2, p. 224-227, 2004.
Time Duration: 
224-227
Publisher: 
Universidade de São Paulo (USP)
Keywords: 
  • Cucurbita moschata
  • cucurbits
  • selfing
Source: 
http://dx.doi.org/10.1590/S0103-90162004000200016
URI: 
http://hdl.handle.net/11449/5322
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/5322
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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