Diallel cross among fresh market tomato inbreeding lines


Autoria(s): Souza, Lívia M de; Paterniani, Maria Elisa AGZ; Melo, Paulo César T de; Melo, Arlete MT de
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

04/11/2013

04/11/2013

2012

Resumo

The general combining ability (GCA), specific combining ability (SCA), and heterosis were studied in a complete diallel cross among fresh market tomato breeding lines with reciprocal excluded. Fifteen genotypes (five parents and ten hybrids) were tested using a randomized complete block design, with three replications, and the experiments were conducted in Itatiba, São Paulo state, Brazil, in 2005/06. The yield components evaluated were fruit yield per plant (FP), fruit number per plant (FN), average fruit weight (FW); cluster number per plant (CN); fruit number per cluster (FC), fruit wall thickness (FT) and number of locules per fruit (NL). Fruit quality components evaluated were total soluble solids (SS); total titratable acidity (TA); SS/TA ratio, fruit length (FL); fruit width (WI); length to width ratio (FL/WI). The data for each trait was first subjected to analysis of variance. Griffing's method 2, model 1 was employed to estimate the general (GCA) and specific (SCA) combining abilities. Parental and hybrid data for each trait were used to estimate of mid-parent heterosis. For plant fruit yield, IAC-2 was the best parental line with the highest GCA followed by IAC-4 and IAC-1 lines. The hybrids IAC-1 x IAC-2, IAC-1 x IAC-4 and IAC-2 x IAC-4 showed the highest effects of SCA. High heterotic responses were found for fruit yield and plant fruit number with values up to 49.72% and 47.19%, respectively. The best hybrids for fruit yield and plant fruit number were IAC-1 x IAC-2, IAC-1 x IAC-4 and IAC-2 x IAC-5, for fruit yield and plant fruit number, the main yield components.

Identificador

Hortic. Bras.,v.30,n.2,p.246-251,2012

0102-0536

http://www.producao.usp.br/handle/BDPI/38896

10.1590/S0102-05362012000200011

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000200011&lng=en&nrm=iso&tlng=en

http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0102-05362012000200011&lng=en&nrm=iso&tlng=en

http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0102-05362012000200011&lng=en&nrm=iso&tlng=en

Idioma(s)

eng

Publicador

Associação Brasileira de Horticultura

Relação

Horticultura Brasileira

Direitos

openAccess

Palavras-Chave #Solanum lycopersicum #yield components #fruit quality #combining ability #heterosis #plant breeding #Solanum lycopersicum #componentes da produção #qualidade de fruto #capacidade de combinação #heterose #melhoramento
Tipo

article

original article