Inheritance and allelic relationship between genes conferring resistance to Pyricularia oryzae in rice

Singh, H.P.; Basandrai, Daisy; Rathour, Rajeev; Basandrai, Ashwani K.

doi:10.1007/s42360-021-00426-z

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Bunt infection in raw seed (unprocessed) was higher than the permissible limit in all the three seed lots (Table 1) due to cooler temperature and well distributed rainfall during anthesis stage. A temperature range of 25-30°C, relative humidity of 85% or more and intermittent showers at ear emergence stage are reported to influence the disease development of paddy bunt (Singh and Pavgi 1970, Whitney and Freideriksen 1975, Cartwright 1997). It has already been highlighted that it is not the amount of rainfall but the distribution of rainfall, which accounts for the bunt outbreaks.…”

Section: Resultsmentioning

confidence: 99%

Management of paddy bunt (Tilletia barclayana) through mechanical seed processing

Kumar

Gupta

2023

Indian J Agri Sci

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Paddy bunt or kernel smut of rice caused by Tilletia barclayana (Syn. Neovossia barclayana, N. horrida) is majordisease of rice growing countries. Seeds of two lots of Pusa 44 variety produced during kharif 2014 and one lotproduced during kharif 2015 were processed. Pre-cleaner and screen grader removed 44.7, 34.8 and 42.2% of totalbunt infected seed present in the three seed lots and reduced bunt infection from 1.32 to 0.73, 1.58 to 1.03 and 3.05 to1.76%, respectively. Eighteen combination treatments comprising of three deck slopes (S1- 2.50, S2- 2.00, S3- 1.50),three feedings (F1- 9 kg, F2- 12 kg, F3- 15 kg per minute) and two output settings (O1- 30cm deck width, O2- 40cmdeck width) of specific gravity separator were studied with an objective of getting maximum bunt free seed per unitof time. Maximum seed recovery (13.27 and 13.31 and 13.60 kg/minute) and bunt infection in final product (0.44,0.41 and 0.46%) with 89.1, 89.7 and 92.3% recovery efficiency was obtained by the treatment S3F3O2 (slope of deck1.50, feeding 15 kg/minute, output deck width 40 cm) in the three seed lots. Thus, mechanical processing reducedbunt infection by more than 65%, depending on the intensity of infection, as well as increased seed quality i.e. seedgermination improved by 6.5% and physical purity by 5.34%.

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Section: Resultsmentioning

confidence: 99%

Management of paddy bunt (Tilletia barclayana) through mechanical seed processing

Kumar

Gupta

2023

Indian J Agri Sci

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“…Aggressiveness is a combined measurement of the functional characteristics of the pathogen, including its infection efficiency, sporulation rate, latent period, and lesion growth [ 53 , 54 ]. Unlike virulence profiles (i.e., the ability of a pathogen strain to induce disease or not) which are governed by major genes with simple inheritance [ 55 ], aggressiveness is controlled by many genes distributed throughout the pathogen genome, with each gene contributing a minor but additive effect to the phenotypic value of this quantitative trait [ 56 ], and is usually more sensitive to environmental variations, such as changes in temperature [ 57 ], providing a unique opportunity to study pathogen adaptation to global warming. Therefore, empirical insights into the genetic and physiological determinants of aggressiveness and its thermal preferences and how these genetic, physiological, and ecological characteristics may respond to changes in air temperature are required for robust projections of future plant disease epidemics and food production worldwide.…”

Section: Introductionmentioning

confidence: 99%

Elevating Air Temperature May Enhance Future Epidemic Risk of the Plant Pathogen Phytophthora infestans

Wang

Yang

et al. 2022

JoF

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Knowledge of pathogen adaptation to global warming is important for predicting future disease epidemics and food production in agricultural ecosystems; however, the patterns and mechanisms of such adaptation in many plant pathogens are poorly understood. Here, population genetics combined with physiological assays and common garden experiments were used to analyze the genetics, physiology, and thermal preference of pathogen aggressiveness in an evolutionary context using 140 Phytophthora infestans genotypes under five temperature regimes. Pathogens originating from warmer regions were more thermophilic and had a broader thermal niche than those from cooler regions. Phenotypic plasticity contributed ~10-fold more than heritability measured by genetic variance. Further, experimental temperatures altered the expression of genetic variation and the association of pathogen aggressiveness with the local temperature. Increasing experimental temperature enhanced the variation in aggressiveness. At low experimental temperatures, pathogens from warmer places produced less disease than those from cooler places; however, this pattern was reversed at higher experimental temperatures. These results suggest that geographic variation in the thermal preferences of pathogens should be included in modeling future disease epidemics in agricultural ecosystems in response to global warming, and greater attention should be paid to preventing the movement of pathogens from warmer to cooler places.

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Identification and validation of blast resistance Pi1 gene in the derived mapping population of rice variety, NLR34449 through molecular markers

Aleena,

Padma,

Rekha

et al. 2023

Indian Phytopathology

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Inheritance and allelic relationship between genes conferring resistance to Pyricularia oryzae in rice

Cited by 3 publications

References 27 publications

Management of paddy bunt (Tilletia barclayana) through mechanical seed processing

Management of paddy bunt (Tilletia barclayana) through mechanical seed processing

Elevating Air Temperature May Enhance Future Epidemic Risk of the Plant Pathogen Phytophthora infestans

Identification and validation of blast resistance Pi1 gene in the derived mapping population of rice variety, NLR34449 through molecular markers

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