Leaf and neck blast resistance reaction in tropical rice lines under green house condition |
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Authors: | Krishna Datta Puri Sunder Man Shrestha Gopal Bahadur Khhatri Chhetri Krishna Dev Joshi |
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Institution: | (1) Institute of Agriculture and Animal Science, Tribhuvan University, Chitwan, Nepal;(2) CAZS-NR, University of Wales, Bangor, UK, C/O CIMMYT-South Asia, Kathmandu, Nepal |
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Abstract: | Rice blast (Magnaporthe
oryzae) is the most destructive and epidemic disease of rice. Use of host resistance is the best alternative for disease management.
The leaf and neck blast resistance of 182 rice breeding lines were assessed for leaf and neck blast and classified relative
to a susceptible check-Masuli and resistant check-Laxmi, from greenhouse experiment in 2005 and 2006. The test plants were
inoculated with 105 conidial suspension/ml of M. oryzae at 21 days old seedlings for the leaf blast, and at neck base for the neck blast. Among them, for leaf blast, 77 rice lines
were resistant, 43 were moderately resistant, 39 were moderately susceptible and 23 were susceptible. While among the selected
31 rice lines evaluated for neck blast, 4 lines were resistant, 4 were moderately resistant, 16 were moderately susceptible
and 7 were susceptible. Leaf and neck infection was significant and positively correlated (r = 0.30, P = 0.05). The rice lines, Barkhe 1032, Barkhe 1034, Barkhe 1035, Barkhe 1036, Barkhe 2014, Barkhe 2024, Barkhe 3019, Super
3004 were resistant to leaf blast and Barkhe 1006, Barkhe 1032, Barkhe 1035, Barkhe 3004 were resistant to neck blast. The
rice lines with identification # 11, 69, 137, 168, 182 from Masuli × MT4 parentage, and Barkhe 3017 were susceptible to both
leaf and neck blast. Progenies of Irradiated Pusa Basmati (IPB), Kalinga III/IR64 (KIII/IR64), and Masuli/IR64 were resistant
to both leaf and neck blast. However, most progenies from Masuli/MT4 showed susceptible reaction to both leaf and neck blast.
Thus, rice lines form the IPB, KIII/IR64 and Masuli/IR64 will be promising resistant sources for rice blast in breeding programme. |
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Keywords: | Breeding lines Leaf blast Magnaporthe Neck blast Resistance |
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