Combining ability and heterosis for resistance to black-spot in papaya genotypes by diallel analysis

被引：11

作者：

Vivas, Marcelo ^{[1
]}

da Silveira, Silvaldo Felipe ^{[1
]}

Cardoso, Deisy Lucia ^{[2
]}

Pereira, Messias Gonzaga ^{[2
]}

Dias dos Santos, Pedro Henrique ^{[1
]}

Ferreguetti, Geraldo Antonio ^{[3
]}

机构：

[1] Univ Estadual N Fluminense Darcy Ribeiro, Ctr Ciencias & Tecnol Agr, Lab Entomol & Fitopatol, BR-28015620 Campos Dos Goytacazes, RJ, Brazil

[2] Univ Estadual N Fluminense Darcy Ribeiro, Ctr Ciencias & Tecnol Agr, Lab Melhoramento Genet Vegetal, BR-28015620 Campos Dos Goytacazes, RJ, Brazil

[3] Caliman Agr SA, BR-29900970 Linhares, ES, Brazil

来源：

TROPICAL PLANT PATHOLOGY | 2012年 / 37卷 / 05期

关键词：

Asperisporium caricae; Carica papaya; hybridization; HYBRIDS; SELECTION; TESTERS;

D O I：

10.1590/S1982-56762012000500004

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Combining ability and heterosis for resistance to black-spot in papaya genotypes by diallel analysis Diallelic crosses were performed between eight papaya genotypes belonging to the 'Solo' and 'Formosa' heterotic groups (four belonging to each group). The 56 hybrid combinations (F1's and reciprocals) along with their parents were evaluated in a complete randomized block design for resistance to black spot disease, caused by Asperisporium caricae. The severity of black spot in leaves and fruits was quantified in two occasions, March and May 2010. When the genotype effect was significant, heterosis as well as general and specific combining ability were estimated from the severity data. The genotypes 'JS12-N', 'Sekati', 'Golden' and 'Sunrise Solo 72/12' displayed better general combining ability for both characteristics. Twelve hybrids displayed promising results for selection, with low values of specific combining ability for resistance to black spot leaves and fruits. The heterotic group did not affect hybrid performance or heterosis estimates. Heterosis in papaya for resistance to black spot may provide significant genetic gains from both inter-and intra-heterotic crosses, and especially from hybridizations involving genotypes of the 'Solo' group.

引用

页码：326 / 332

页数：7

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