Reaction of Different Rice Lines Against Leaf and Neck Blast under Field Condition Of Chitwan Valley

Puri, Krishna D.; Shrestha, Sundar Man; Joshi, Kailash; Kc, Govind

doi:10.3126/jiaas.v27i0.693

Cited by 6 publications

(6 citation statements)

References 14 publications

(10 reference statements)

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“…Similarly in this study significantly high mean blast incidence and severity were observed in rice fields at the booting and grain filling stage than at the vegetative and pre-anthesis stage. This was congruent with observation in other similar studies elsewhere (Puri et al, 2006;Ramappa et al, 2002). Comparable to a study reported by Asfaha, Selvaraj, and Woldeab (2015), at higher altitude blast incidence and severity were lower probably due to low relative humidity that hinders the development of the disease, while at a lower altitude, the temperatures were high and therefore not favorable for spore germination.…”

Section: Discussionsupporting

confidence: 94%

“…However, the spores/conidia are efficiently moved from crop-to-crop and field-to-field by wind, and rain-water as well as the movement and accumulation of infected crop residues (Raveloson, Ratsimiala Romanta, Tharreau, & Sester, 2018). Though infection occurs at all stages of growth, infection at an early vegetative stage for foliar blast and at booting for neck blast is critical on the crop yield (Puri, Shrestha, Joshi, & Chhetri, 2006;Ramappa, Ravishankar, & Prakash, 2002). Early and severe infection causes stunting, development of small panicles, and a white-head often mistaken for insect pest damage (Mousanejad et al, 2010;Bonman, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda

Amayo¹,

Oparok²,

Lamo³

et al. 2020

JAS

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Rice blast disease remains the most important contributor to low and stagnated rice yields in Uganda. However, the role of the smallholder farming system in shaping the prevalence of the disease in the country is not known. In 2015B and 2016A, we surveyed smallholder rice farmlands in 27 districts of Uganda and recorded blast incidence, severity, and symptoms expression. Infected rice samples taken from the infected plants were sub-cultured on PDA media to confirm the pathogen and obtain isolates for the establishment of a core collection for breeding work. Rice blast prevalence in the districts varied from 50-100% and the national average stood at 72.61%, higher than that recorded five years ago. Mean incidence and severity varied significantly (< 0.001) with the highest incidence (96.8%) recorded in Luwero district and the least (21.3%) was recorded in the Amuru district. However, the eastern region recorded the highest average incidence (74.5%) followed by the central, the northern, and Mid-western regions. In the rice ecologies, the highest blast incidence was recorded in the rain-fed lowland rice (72.18%) followed by irrigated lowland (59.53%) and rain-fed upland rice (47.27%). This is the first report on the prevalence of blast in smallholder rice farmlands in Uganda and showed a higher prevalence of the disease.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda

Amayo¹,

Oparok²,

Lamo³

et al. 2020

JAS

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“…Resistance and susceptible interaction on rice conferred by single amino acid substitution in Pi-ta leucine rich domain (LRD) or in the AVR-Pi-ta176 protease motif that result in loss of resistant in plant and also disturb the physical interaction among them was reported by Jia et al (2000).Thus, the rice genotypes used in this study having different genetic background showed different interaction to leaf blast. Such result was also supported by the work of Koh et al (1987), Chaudhary (2001) and Puri et al (2006). Blast is damaging under tropical low land condition (Bonman et al, 1989).…”

Section: Discussionsupporting

confidence: 58%

Screening of rice genotypes for leaf blast resistance under field condition

Sharma

Magar

Baidya

et al. 2020

J. Agric. Nat. Res.

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Blast, caused by Pyriculariagrisea (Sacc.) is the most destructive disease of rice in Nepal. To identify the sources of leaf blast resistance in rice genotypes, a field experiment was conducted under natural epiphytotic condition at National Plant Pathology Research Centre (NPPRC), Khumaltar, Lalitpur, Nepal during summer season in 2018 and 2019.A total of 128 rice genotypes in 2018 and 291during 2019 including resistant check (Sabitri) and susceptible check (Shankharika/Mansuli) were tested. Field experiment was conducted in single rod row design. Leaf blast disease assessment was done according to 0-9 scale. During 2018, 59 entries were highly resistant (Score 0), 34 resistant (Score 1), 26 moderately resistant (Score 2-3), 5 were moderately susceptible (Score 4-5), 4 susceptible (Score 6-7) and none of them were highly susceptible (Score 8-9) to leaf blast. Similarly, in 2019, 6 lines were highly resistant, 70 resistant, 196 moderately resistant, 15 lines were moderately susceptible, 4 susceptible and none of them were highly susceptible to the disease. Only, one genotype NR2179-82-2-4-1-1-1-1 (Score 1) was found resistant in both years. Similarly, genotype NR2182-22-1-3-1-1-1 (Score 2-3) was found moderately resistant. Some of the genotypes were found resistant in 2018 which become moderately resistant in 2019, they were NR2180-20-2-5-1-1-1-1, IR97135-8-3-1-3, IR98786-13-1-2-1, NR2181-139-1-3-1-1-1-1, and IR13F402. So, findings of these resistant and moderately resistant genotypes could be used in resistant source for the development of leaf blast resistant rice varieties through hybridization in future.

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“…Rice blast, caused by Magnaporthe oryzae is a serious disease responsible for yield loss to the tune of 80% s [2,3]. Each year, this disease is estimated to destroy enough rice that could feed more than 60 million people [4].…”

Section: Introductionmentioning

confidence: 99%

Mating Types Analysis of Magnaporthe oryzae Populations by Molecular Methods

Samanta¹,

Dhua²,

Nayak³

et al. 2014

TOBIOTJ

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Rice blast is a devastating disease which is caused by the heterothallic fungus Magnaporthe oryzae. Compatible sexual recombination which occurs between two M. oryzae strains of different mating types, can enhance genetic variability. Assessment of mating type alleles is used as a marker to measure population diversity. Forty six isolates of M. oryzae were collected from infected rice leaves from various ecosystems of coastal Odisha, India, and the mating type analysis using molecular markers was carried out. MAT1-1 mating type was dominating in all the ecosystems and MAT1-2 was found to be present in uplands as well as in irrigated fields. Both mating types could be found in the same field in irrigated ecosystem. The disease spread was very fast vertically as well as horizontally in those fields resulting in blast lesions looking as 'green islands (gi) produced in senescence leaves', and MAT1-2 was found to be associated with all gi lesions. Consequently, the management of the disease in those plots was very difficult. Interestingly, ribosomal RNA IGS region could not be amplified in MAT1-2 isolates but consistent amplification was obtained in MAT1-1 mating type isolates.

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Reaction of Different Rice Lines Against Leaf and Neck Blast under Field Condition Of Chitwan Valley

Cited by 6 publications

References 14 publications

Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda

Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda

Screening of rice genotypes for leaf blast resistance under field condition

Mating Types Analysis of Magnaporthe oryzae Populations by Molecular Methods

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