Heterosis and combining abilitiy of summer squash lines selected for parthenocarpy and resistance to Papaya ringspot virus (PRSV-W) / Heterose e capacidade combinatÃria de linhagens de abobrinha partenocÃrpicas e resistentes ao Papaya ringspot virus(PRSV-W)

AUTOR(ES)

Douglas Willian Nogueira

DATA DE PUBLICAÇÃO

2007

RESUMO

This objective of this work was to study the combining ability of summer squash lines selected for parthenocarpy and resistance to Papaya ringspot virus (PRSV-W), and the expression of heterosis in hybrids derived from them. The genetic material comprised 24 genotypes of Cucurbita pepo L. in a partial diallel cross design - four group I parental lines, four group II parental lines, and 16 F1 hybrids obtained from crosses between group I x group II lines. The lines in group I were 1=ABX-037G-77-03-05-01-01-bulk, 2=ABX-037G-77-03-05-03-10-bulk, 3=ABX-037G-77-03-05-01-04-bulk and 4=ABX-037G-77-03-05-05-01-bulk; those in group II were 1 =ABX-037G-77-03-05-04-08-bulk, 2 =ABX-037G-77-03-05-02-11-bulk, 3 =Clarice and 4 =Caserta. Parthenocarpy and resistance to PRSV-W were evaluated through scales graded from 1 to 5. The following horticultural traits were also evaluated: total yield (ton.ha-1), mean fruit mass (g.fruit-1), number of fruits per plant, and early yield (ton.ha-1). The experimental setup was a randomized complete block design with 3 replications. Both additive and non-additive gene effects were important in the expression of parthenocarpy and resistance to PRSV-W. Heterosis values for parthenocarpy were usually in the direction of higher degrees os parthenocarpy, while for resistance to PRSV-W they were in the direction of lower degree of resistance. At least one experimental F1 hybrid (=ABX-037G-77-03-05-01-01-bulk x ABX-037G-77-03-05-04-08-bulk) was identified with good degrees of parthenocarpy, resistance to PRSV-W , and high yield.

ASSUNTO(S)

melhoramento vegetal potyvirus parthenocarpy potyvirus virose cucurbita pepo viral disease partenocarpia resistance cucurbita pepo resistÃncia

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