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EVALUATION OF RICE
GERMPLASM AGAINST XANTHOMONAS ORYZAE CAUSING BACTERIAL
LEAF BLIGHT
MUHAMMAD AFZAL AKHTAR1,
FIDA MOHAMMAD ABBASI2, HABIB AHMAD2*MUHAMMAD
SHAHZAD1, MEHR ALI SHAH3 AND AZHAR HUSAIN SHAH4
Abstract:
Bacterial blight
(BB) caused by Xanthomonas oryzae pv oryzae is the most
destructive disease of rice in Pakistan due to its high epidemic
potential. Forty seven rice accessions comprising 6 crosses, 8 wild
rice, 2 commercial varieties, 23 isogenic lines, 7 new plant type and 1
mutant, were evaluated against 25 isolates (X01, X02, X03, X04, X05,
X06, X07, X08, X09, X010, , X011, X012, X013, X014, X015, X016,
X017, X018, X019, , X020, X0139, X0140, X0143, X0146, X067) in bulk
form under heavy inoculum load in glass house. Data were recorded at 15
days after inoculation on 0-4 rating scale. Interspecific crosses showed
a range from 1.0 to 13 cm, wild rice alone showed range from 1.0 to
12cm, isogenic lines of rice showed range from 1.2 to 29.8 cm, while new
plant type, mutant and commercial varieties varied within the range 1.0
to 12.0cm, 6.6, and 16.8 to 18.4 cm, respectively. Resistance against
bacterial leaf blight isolates was observed in IR6 x Oryza nivara,
O. longistminata, O. punctata, O. nivara and IRBB24
(isogenic line). Bas.385 and KS282, the cultivated rice were susceptible
to all isolates. Use of resistant wild species viz., O. nivara,
O. longistminata and O. punctata are therefore recommended
for transgressing bacterial blight resistance to the cultivated rice.
1Crop Disease Research Programme , National Agriculture Research Center
(NARC) Islamabad, Pakistan
2Department of Genetics, Hazara University, Mansehra, Pakistan
3
Khyber Pakhtunkhwa, Agriculture University, Peshawar, Pakistan
4Department of Botany, Hazara University, Mansehra, Pakistan
Author for
correspondence:
drhahmad@gmail.com
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