Transmission of Microdochium albescens from seeds to seedlings in the pre-germinated cultivation system of irrigated rice

Scheidt, Bruno Tabarelli; Garcia, Jaquelini; Casa, Ricardo Trezzi; Coelho, Cileide Maria Medeiros; Bogo, Amauri; Berghetti, Juliano

doi:10.1590/0103-8478cr20180898

Cited by 3 publications

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“…The seeds are considered a source of primary inoculum (WEBSTER & GUNNELL, 1992), and are responsible for the dissemination of innumerable pathogens that cause important diseases in the rice culture (SILVA et al, 2014). Microdochium albescens is transmitted from seed to irrigated rice seedling (SCHEIDT et al, 2020) causing discoloration in the seedlings (GUTIERREZ et al, 2009). Despite that, currently the importance of the health quality of rice seeds is underestimated due to the scarcity of studies that prove the real impact on the physiological quality and the performance of seedlings.…”

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Microdochium albescens may affect the physiological quality of irrigated rice cultivar seeds

et al. 2021

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Knowledge of the effect of the seedborne inoculum is important for knowing the level of tolerance of the pathogen by the seed. This research evaluated the effect of the incidence of the fungus Microdochium albescens on the physiological quality of the seeds of different cultivars of irrigated rice. The study was carried out in the seed testing laboratory (STL), phytopathology laboratory and in greenhouse, located at the Center of Agroveterinary Sciences of the Santa Catarina State University, Lages, SC, Brazil. Seeds from six irrigated rice cultivars produced in the Alto Vale do Itajaí Region in the 2016/17 harvest, were used. The lots were submitted to the seed health test, identifying four lots per cultivar with a natural incidence of M. albescens, with two lots of each cultivar with an incidence greater than 40% and two lots equal or less than 40%, totaling 24 seed lots. The following evaluations were carried out on the lots: germination, accelerated aging test, emergence in a greenhouse at 14 days, emergence speed index (ESI), emergence speed (ES), shoot length, root length and fresh and dry mass. There was a significant interaction between cultivar and level of incidence only in the variables germination, vigor and root length. Fresh mass, shoot length and ESI were not affected, regardless of cultivar and incidence of fungus in the seed. The irrigated rice cultivars SCS118 Marquês and SCSBRS Tio Taka are susceptible to a high incidence (> 40%) of the fungus M. allbescens.

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Microdochium albescens may affect the physiological quality of irrigated rice cultivar seeds

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Control of Microdochium albescens in pre-germinated and dryland rice seeds

et al. 2022

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The fungus Microdochium albescens can interfere in the germination of seeds and in the death of rice seedlings; however, there is not technical indication for its control by seed treatment. This research evaluated the efficiency of fungicides in the treatment of pre-germinated and dryland rice seeds in the control of M. albescens. Seeds of the cultivars, Epagri 109, SCS116 Satoru, SCS121 CL and SCS122 Miura were treated with the following fungicides (g a.i./100 kg of seeds): fluazinam + thiophanate methyl (9.45 + 63), pyraclostrobin + thiophanate methyl (5 + 45), carboxin + thiram (60 + 60), metalaxyl-M + thiabendazole + fludioxonil (3 + 22.5 + 3.75), carbendazim + thiram (45 + 105), carbendazim (45). Seeds without fungicide treatment constituted the control. The treated seeds were sown in potato-sucrose-agar (PSA) culture medium and incubated at 25 ± 2 °C and photoperiod of 12 hours for 14 days. Treated seeds were also submitted to the germination test. Fluazinam + thiophanate methyl and metalaxyl-M + thiabendazole + fludioxonil showed greater control of M. albescens, not differing statistically between them, in the five cultivars and in the two cultivation systems. The tested fungicides provided seed germination above 90% in the four cultivars.

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Asymmetric Effects of Cereals Crops on Agricultural Economic Growth: A Case Study of India

Bansal

Kumar

Mohammad

et al. 2021

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The study explores the asymmetric effects of cereals crops, namely wheat, rice, and maize production on agricultural economic growth in India during 1960–2019. The asymmetric ARDL method is used in this study to analyze the asymmetric relationship between the independent and dependent variables. The findings reveal a link between cereal crop growth and agricultural economic growth. The NARDL findings indicate that positive maize and rice shocks have a considerable short- and long-term influence on agricultural economic growth. In contrast, the positive shock of wheat production is not significant. While the negative shocks of maize, rice and wheat production significantly impact agricultural economic growth. In a nutshell, the study reveals that agriculture growth has an asymmetric relationship with maize, wheat and rice production. The study's findings imply that policymakers should develop long- and short-term plans to boost agricultural growth and productivity in order to help farmers.

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Transmission of Microdochium albescens from seeds to seedlings in the pre-germinated cultivation system of irrigated rice

Cited by 3 publications

References 5 publications

Microdochium albescens may affect the physiological quality of irrigated rice cultivar seeds

Microdochium albescens may affect the physiological quality of irrigated rice cultivar seeds

Control of Microdochium albescens in pre-germinated and dryland rice seeds

Asymmetric Effects of Cereals Crops on Agricultural Economic Growth: A Case Study of India

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