Abstract
Blast (Magnaporthe grisea) and rust (Puccinia substriata var. indica) are the two important foliar diseases of pearl millet (Pennisetum glaucum (L.) R. Br.) that can be best managed through host plant resistance. For identification of diverse sources of blast and rust resistance, 305 accessions of Pennisetum violaceum, a wild relative of pearl millet, were screened under greenhouse conditions against five pathotype-isolates of M. grisea and a local isolate of P. substriata var. indica collected from ICRISAT farm, Patancheru, India. Based on the mean blast score (1 to 9 scale), 17 accessions (IP 21525, 21531, 21536, 21540, 21594, 21610, 21640, 21706, 21711, 21716, 21719, 21720, 21721, 21724, 21987, 21988, and 22160) were found resistant (score ≤3.0) to all five pathotypes, and 24 accessions were resistant to four pathotypes of M. grisea. As there was variability for rust resistance within some accessions, individual rust-resistant (<5% severity) plants from 17 accessions were selected, grown in pots and advanced to next generation by selfing, and rescreened for three to four generations following pedigree selection to develop rust-resistant genetic stocks. Single plant selections from nine accessions (IP 21629, 21645, 21658, 21660, 21662, 21711, 21974, 21975, and 22038) were found highly resistant to rust (0% rust severity) after four generations of pedigree selection and subsequent screening. Some of the blast-resistant accessions and rust-resistant genetic stocks are being utilized in a prebreeding program at ICRISAT for introgressing resistance genes from the wild into the parental lines of cultivated and potential pearl millet hybrids and varieties.
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Claims 4
Claim · model-written summary
Seventeen accessions resisted all five blast pathotypes with scores at most 3.0.
- Taxon
- Pennisetum violaceumCenchrus violaceust0
- Material
- 17 accessionse0
- Interactor
- Magnaporthe grisea
Pyricularia griseat1pathogen - Outcome
- resistante0
- Value
- score ≤3.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“17 accessions (IP 21525, 21531, 21536, 21540, 21594, 21610, 21640, 21706, 21711, 21716, 21719, 21720, 21721, 21724, 21987, 21988, and 22160) were found resistant (score ≤3.0) to all five pathotypes”
t0“Pennisetum violaceum”
t1“Magnaporthe grisea”
Claim · model-written summary
Twenty-four accessions resisted four blast pathotypes.
- Taxon
- Pennisetum violaceumCenchrus violaceust0
- Material
- 24 accessionse0
- Interactor
- M. griseaPyricularia griseae0pathogen
- Outcome
- resistant to four pathotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“24 accessions were resistant to four pathotypes of M. grisea”
t0“Pennisetum violaceum”
Claim · model-written summary
Selections from nine accessions had zero rust severity after four generations.
- Taxon
- Pennisetum violaceumCenchrus violaceust0
- Material
- nine accessionse0
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicat1pathogen
- Outcome
- rust severitye0
- Value
- 0%e0
- Qualifier
- after four generations of pedigree selectione0
Verbatim
e0“Single plant selections from nine accessions (IP 21629, 21645, 21658, 21660, 21662, 21711, 21974, 21975, and 22038) were found highly resistant to rust (0% rust severity) after four generations of pedigree selection and subsequent screening”
t0“Pennisetum violaceum”
t1“Puccinia substriata var. indica”
Claim · model-written summary
Resistant materials are being used in prebreeding.
- Taxon
- Pennisetum violaceumCenchrus violaceust0
- Outcome
- being utilized in a prebreeding programe0
- Setting
- ICRISATe0
Verbatim
e0“Some of the blast-resistant accessions and rust-resistant genetic stocks are being utilized in a prebreeding program at ICRISAT”
t0“Pennisetum violaceum”