Identification of QTLs associated with citrus resistance to Phytophthora gummosis

被引：43

作者：

Siviero, A

Cristofani, M ^{[1
]}

Furtado, EL

Garcia, AAF

Coelho, ASG

Machado, MA

机构：

[1] Inst Agron, IAC, Ctr APTA Citros Sylvio Moreira, BR-13469970 Sao Paulo, Brazil

[2] EMBRAPA, Rio Branco Acre, Brazil

[3] Univ Estadual Paulista, UNESP, Fac Ciencias Agron, Botucatu, SP, Brazil

[4] Univ Fed Sao Paulo, Escola Super Agr Luiz Queiroz, Sao Paulo, Brazil

来源：

JOURNAL OF APPLIED GENETICS | 2006年 / 47卷 / 01期

关键词：

citrus disease; genetic mapping; gummosis; inheritance; Phytophthora; QTL; resistance;

D O I：

10.1007/BF03194595

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Citrus gummosis, caused by Phylophthora spp., is an important citrus disease in Brazil. Almost all citrus rootstock varieties are susceptible to it to some degree, whereas resistance is present in Poncirus trifoliata, a closely related species. The objective of this study was to detect QTLs linked to citrus Phylophthora gummosis resistance. Eighty individuals of the F, progeny, obtained by controlled crosses between Sunki mandarin Citrus sunki (susceptible) and Poncirus trifoliata cv. Rubidoux (resistant), were evaluated. Resistance to Phytophthora parasitica was evaluated by inoculating stems of young plants with a disc of fungal mycelia and measuring lesion lengths a month later. Two QTLs linked to gummosis resistance were detected in linkage groups I and 5 of the P. trifoliala map, and one QTL in linkage group 2 of the C sunki map. The phenotypic variation explained by individual QTLs was 14% for C sunki and ranged from 16 to 24% for P. trifoliala. The low character heritability (h(2) = 18.7%) and the detection of more than one QTL associated with citrus Phytophthora gummosis resistance showed that inheritance of the resistance is quantitative.

引用

页码：23 / 28

页数：6

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