Genetic analysis and pyramiding of two gall midge resistance genes (Gm-2 and Gm-6t) in rice (Oryza sativa L.)
文献类型: 外文期刊
作者: Katiyar, S 1 ; Verulkar, S 2 ; Chandel, G 2 ; Zhang, Y 2 ; Huang, B 2 ; Bennett, J 2 ;
作者机构: 1.Indira Gandhi Agr Univ, Raipur, Madhya Pradesh, India
2.Indira Gandhi Agr Univ, Raipur, Madhya Pradesh, India; Guangdong Acad Agr Sci, Inst Plant Protect, Guangzhou, Peoples R China; Int Rice Res Inst, Div Plant Breeding Genet & Biochem, Los Banos, Laguna, Philippines
关键词: allelic relationship;gall midge;gene pyramiding;insect resistance;Orseolia oryzae;rice
期刊名称:EUPHYTICA ( 影响因子:1.895; 五年影响因子:2.181 )
ISSN: 0014-2336
年卷期: 2001 年 122 卷 2 期
页码:
收录情况: SCI
摘要: Asian rice gall midge ( Orseolia oryzae) is a major pest across much of south and southeast Asia. This pest is genetically diverse and many gall midge biotypes are known to exist in each country. During the last three decades, host plant resistance has proved to be the most effective mechanism of controlling the Asian rice gall midge. Seven genes conditioning resistance to gall midge larvae have been identified in rice (Oryza sativa) and are being used in cultivar improvement programs. However, some of these genes are rendered ineffective by new gall midge biotypes. Increased understanding of genetics, inheritance, allelic relationships and linkage is necessary to maximise the durability of major gene resistance by the pyramiding of these genes. The two genes, Gm-2 and Gm-6(t), are known to confer resistance against a number of biotypes in India and China, respectively. An F-3 population derived from a cross between Duokang #1 (donor of Gm-6(t)) and Phalguna (donor of Gm-2) was screened against Chinese gall midge biotype 4 at Guangdong, China, and Indian gall midge biotype 1 at Raipur, India. At each location, separately, a single gene governed resistance. The parallel segregation of 417 F-3 progenies for both biotypes at two locations revealed that recombination had occurred between the two genes, establishing that the two genes are not allelic. However, the two genes Gm-2 and Gm-6(t), were found to be linked with a distance of similar to 16.3 cM. A number of lines homozygous at one locus and segregating for the other locus were identified and selected. These lines were selfed to obtain lines homozygous for the favourable alleles at both loci (two locus pyramids). This is the first report on use of conventional host-pest interaction method for pyramiding two closely located Gm-resistance loci of dissimilar effects. The implications of deployment of these pyramids within and across country borders, with reference to the prevailing gall midge populations are discussed.
- 相关文献
作者其他论文 更多>>
-
Molecular mapping of gene Gm-6(t) which confers resistance against four biotypes of Asian rice gall midge in China
作者:Katiyar, SK;Tan, Y;Huang, B;Chandel, G;Xu, Y;Zhang, Y;Xie, Z;Bennett, J
关键词:rice (Oryza sativa);gall midge;Orseolia oryzae;RAPD;mapping;sequence tagged sites
-
Biodiversity of Asian rice gall midge (Orseolia oryzae Wood Mason) from five countries examined by AFLP analysis
作者:Katiyar, SK;Chandel, G;Tan, Y;Zhang, Y;Huang, B;Nugaliyadde, L;Fernando, K;Bentur, JS;Inthavong, S;Constantino, S;Bennett, J
关键词:biotypes;Cecidomyiidae;insect;Oryza sativa;Platygaster oryzae;population;sexual dimorphism