title: Rice-gall midge interactions: Battle for survival.
abstract: Gall midges are insects specialized in maneuvering plant growth, metabolic and defense pathways for their benefit. The Asian rice gall midge and rice share such an intimate relationship that there is a constant battle for survival by either partner. Diverse responses by the rice host against the midge include necrotic hypersensitive resistance reaction, non-hypersensitive resistance reaction and gall-forming compatible interaction. Genetic studies have revealed that major R (resistance) genes confer resistance to gall midge in rice. Eleven gall midge R genes have been characterized so far in different rice varieties in India. In addition, no single R gene confers resistance against all the seven biotypes of the Asian rice gall midge, and none of the biotypes is virulent against all the resistance genes. Further, the interaction of the plant resistance gene with the insect avirulence gene is on a gene-for-gene basis. Our recent investigations involving suppressive subtraction hybridization cDNA libraries, microarray analyses, gene expression assays and metabolic profiling have revealed several molecular mechanisms, metabolite markers and pathways that are induced, down-regulated or altered in the rice host during incompatible or compatible interactions with the pest. This is also true for some of the pathways studied in the gall midge. Next generation sequencing technology, gene expression studies and conventional screening of gall midge cDNA libraries highlighted molecular approaches adopted by the insect to feed, survive and reproduce. This constant struggle by the midge to overcome the host defenses and the host to resist the pest has provided us with an opportunity to observe this battle for survival at the molecular level.
authors.affiliation: Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, India.
authors.forename: Jagadish S
authors.initials: JS
authors.lastname: Bentur
authors.affiliation: Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, India.
authors.forename: Nidhi
authors.initials: N
authors.lastname: Rawat
authors.affiliation: Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, India.
authors.forename: D
authors.initials: D
authors.lastname: Divya
authors.affiliation: International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India.
authors.forename: Deepak K
authors.initials: DK
authors.lastname: Sinha
authors.affiliation: International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India.
authors.forename: Ruchi
authors.initials: R
authors.lastname: Agarrwal
authors.affiliation: International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India.
authors.forename: Isha
authors.initials: I
authors.lastname: Atray
authors.affiliation: International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India. Electronic address: suresh@icgeb.res.in.
authors.forename: Suresh
authors.initials: S
authors.lastname: Nair
mesh_terms: D000818:Animals; D002683:Chironomidae / Q000472:pathogenicity / Q000502:physiology*; D005260:Female; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D006790:Host-Parasite Interactions; D019476:Insect Proteins / Q000502:physiology; D008297:Male; D012275:Oryza / Q000235:genetics / Q000469:parasitology*; D057865:Plant Immunity / Q000235:genetics
chemical_list: D019476:Insect Proteins
keywords: Biomarkers; Cecidomyiidae; Diptera; Expressed sequence tags (ESTs); Gene expression; Insect–plant interaction; Metabolic profiling; Metabolomics; Next generation sequencing (NGS); Orseolia oryzae; R genes; Rice gall midge; Rice–gall midge interaction; Secreted salivary gland proteins (SSGPs); Serine proteases; Transcriptomics; avr genes