New virulent pathotypes of Sclerospora graminicola and resistance sources in pearl millet for A1 zone in India

RAJAN SHARMA; S K GUPTA; D L KADVANI; ASHA SHIVPURI; K N RAI

doi:10.56093/ijas.v84i6.41440

Authors

RAJAN SHARMA International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324
S K GUPTA International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324
D L KADVANI Agricultural Research Station, Junagadh Agricultural University, Jamnagar, Gujarat
ASHA SHIVPURI Agricultural Research Station, SK Rajasthan Agricultural University, Durgapura, Jaipur, Rajasthan
K N RAI International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324

https://doi.org/10.56093/ijas.v84i6.41440

Keywords:

A1 zone, Downy mildew, Pathotypes, Pearl millet, Virulence

Abstract

Sixteen isolates of downy mildew (DM) pathogen (Sclerospora graminicola) collected during 2009 and 2010 from the A1 zone in India that comprises parts of Rajasthan, Gujarat and Haryana were characterized for virulence diversity along with five isolates collected during 1997 to 2005 from this region that are currently being used in the greenhouse screening. Based on DM incidence, three new pathotypes Sg 445, Sg 526 and Sg 519 identified as most virulent were selected for the greenhouse screening of 158 breeding lines under high disease pressure (>90% disease incidence in the susceptible checks). Twenty nine lines were resistant (=10% disease incidence) to at least one of the three pathotypes. Three lines were free from DM and five lines were resistant (=10% disease incidence) to all the three pathotypes, and seven lines were resistant to two of the three pathotypes. The multiple pathotype resistance identified in these breeding lines provides valuable genetic resources for breeding disease resistant pearl millet parental lines and hybrids for A1 zone in India.

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References

Bidinger F R, Yadav O P and Rattunde E W. 2009. Genetic improvement of pearl millet for the arid zone of northwestern India: lessons from two decades of collaborative ICRISAT- ICAR research. Experimental Agriculture 45(1): 107–15. DOI: https://doi.org/10.1017/S0014479708007059

Idris M O and Ball S L. 1984. Inter- and intracontinental sexual compatibility in Sclerospora graminicola. Plant Pathology 33(2): 219–23. DOI: https://doi.org/10.1111/j.1365-3059.1984.tb02643.x

Michelmore R W, Pawar M N and Williams R J. 1982. Heterothallism in Sclerospora graminicola. Phytopathology 72(10): 1 368–72. DOI: https://doi.org/10.1094/Phyto-72-1368

Pushpavathi B, Thakur R P and Chandrashekara Rao K. 2006. Fertility and mating type frequency in Indian isolates of Sclerospora graminicola, the downy mildew pathogen of pearl millet. Plant Disease 90(2): 211–4. DOI: https://doi.org/10.1094/PD-90-0211

Rao V P, Thakur R P, Rai K N and Sharma Y K. 2005. Downy mildew incidence on pearl millet cultivars and pathogenic variability among isolates of Sclerospora graminicola in Rajasthan. International Sorghum and Millets Newsletter 46: 107–10.

Sharma R, Rao V P, Senthilvel S, Rajput S C and Thakur RP. 2011. Virulence diversity in north Indian isolates of Sclerospora graminicola, the pearl millet downy mildew pathogen. Journal of Plant Pathology 93(1): 71–8.

Sharma R, Rao V P, Varshney R K, Prasanth V P, Kannan S and Thakur R P. 2010. Characterization of pathogenic and molecular diversity in Sclerospora graminicola, the causal agent of pearl millet downy mildew. Archives of Phytopathology and Plant Protection 43(6): 538–51. DOI: https://doi.org/10.1080/03235400801939896

Singh S D, Wilson J P, Navi S S, Talukdar B S, Hess D E and Reddy K N. 1997. Screening techniques and sources of resistance to downy mildew and rust in pearl millet. Information Bulletin no. 48, pp 104, International Crops Research Institute for the Semi-Arid tropics, Patancheru, Andhra Pradesh.

Thakur R P, Rao V P, Amruthesh K N, Shetty H S and Datar V V. 2003. Field surveys of pearl millet downy mildew- effects of hybrids, fungicide and cropping sequence. Journal of Mycology and Plant Pathology 33(3): 387–94.

Thakur R P, Rao V P and Sharma R. 2009. Temporal virulence change and identification of resistance in pearl millet germplasm to diverse pathotypes of Sclerospora graminicola. Journal of Plant Pathology 91(3): 629–36.

Thakur R P, Shetty H S and Khairwal I S. 2006. Pearl millet downy mildew research in India: progress and perspectives. International Sorghum and Millets Newsletter 47: 125–30.

Thakur R P, Sivaramakrishna S, Kannan S, Rao V P, Hess D E and Magill C W. 2004. Genetic and pathogenic variability among isolates of Sclerospora graminicola, the downy mildew pathogen of pearl millet. (In) Advances in Downy Mildew, Vol 2, pp 179–92. Phillips P S and Jeger M (Eds). Kluwer Academic Publishers, London. DOI: https://doi.org/10.1007/978-1-4020-2658-4_11