Hypersensitive response and induced resistance in rice gene differentials against
biotype 1 of Asian rice gall midge, Orseolia oryzae at Mandya, Karnataka


VijayKumar L¹*, Patil SU² , Shivanna B³ , Kitturmath MS³

1 Department of Agricultural Entomology, College of Agriculture, V. C. Farm, Mandya – 571405, University of Agricultural     Sciences, Gandhi Krishi Vigyan Kendra (GKVK), Bangalore, Karnataka, India

2 Department of Agricultural Entomology,    Zonal Agricultural and Horticultural Research Station, Brahmavara – 576213,     University of Agricultural and Horticultural     Sciences, Shivamogga, Karnataka, India 

3 Department of Agricultural Entomology, College of Agriculture, University of Agricultural Sciences, Gandhi Krishi               Vigyan Kendra (GKVK), Bangalore – 560065, Karnataka, India. 4 AICRP on rice, Zonal Agricultural Research Station,V.C.     Farm, Mandya – 571405

Corresponding author email: vkumaruasb@gmail.com

Volume 15-(1), 2022   ;  https://doi.org/10.58297/MJYG3539     Click here for Pdf

Received: 28th April 2022; Accepted: 6th June 2022


Hypersensitive reaction (HR) and induced resistance were noticed in resistant rice genotypes infested by gall midge. Detailed observations on Phalguna (Gm2 gene), Abhaya (Gm4 gene), ARC 5984 (Gm5 gene) infested with gall midge biotype 1 revealed that the infestation triggered HR in the plant, leading to extensive tissue necrosis at the apical meristem and browning of central leaf. This was followed by maggot mortality and premature tillering. In susceptible genotypes this phenomenon was not evident. HR leading to necrosis is fatal to host plant but premature tillering was observed. Further, the secondary tillers were infested subsequently with the gall midge biotype 1 eggs at 7, 14, 21 and 28 days after primary infestation, and maggots failed to establish and cause silver shoot. However, HR was observed 6 days after secondary tiller infestation, when the primary tillers were infested 28 days after. But cent per cent maggot mortality was observed, regardless of the time interval between infesting primary and secondary tillers in all the HR + plants. Thus, the HR is not confined to the tillers of primary infestation but it also triggers systemic acquired resistance in other tillers in Phalguna, Abhaya and ARC 5984, whereas, in W1263 (Gm1 gene), HR+ was not evident but antibiotic effects were observed along with maggot mortality.