Confirmation of physiological race of Bipolaris maydis causing maydis leaf blight of maize in India

VENKATESH IDDUMU; ROBIN GOGOI; FIROZ HOSSAIN; A KUMAR; RASHMI AGGARWAL; P K MANDAL

doi:10.56093/ijas.v91i4.112706

Authors

VENKATESH IDDUMU ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ROBIN GOGOI ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
FIROZ HOSSAIN ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
A KUMAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
RASHMI AGGARWAL ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
P K MANDAL ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v91i4.112706

Keywords:

Bipolaris maydis, Maize, Maydis leaf blight, Race

Abstract

Maydis leaf blight (MLB) incited by Bipolaris maydis occurs in most of the maize growing regions. Present study revealed morphological divergence among 74 isolates of B. maydis collected from geographically distant places of India. Based on morpho-cultural features clustered by R software, 25 representative isolates of B. maydis were used for race identification. The internal transcribed spacer (ITS) sequence further confirmed the isolates as B. maydis. In recent concept, variation in disease incidence and infectivity denotes genetic shift in the pathogen or introduction of new pathogenic race(s) through germplasm exchange. For unveiling Indian race(s) of B. maydis, present exploration was made. Four genetically divergent maize genotypes with cytoplasmic male sterility (CMS), viz. -C (MGU- 161QPV-C), -T (MGU- 345PV-T), -S (MGU-150Q-S) and CM-119 (fertile cytoplasm) were assessed using 25 isolates of B. maydis during kharif 2018-19 at ICAR-IARI, New Delhi. The genotype MGU-161QPV-C associated with CMS-C was highly resistant followed by MGU-345PV-T (CMS-T) and MGU-150Q-S (CMS-S), whereas CM-119 showed high susceptibility. Present outcome confirmed prevalence of race 'O' of B. maydis in India and eliminated uncertainty about occurrence of other races, i.e. T and C.

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