National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Rhizoctonia solani causing sheath blight of rice is reported to survive through soil and collateral hosts. Although it infects seed in field, role of seed-borne inoculum in disease development is not properly understood. However, only little information is available on the role of seed-borne inoculum in disease development in the field (Roy, 1989; Acharya and Gupta, 1996; Silvalingam et al., 2006). During the present investigation seed samples of two varieties were collected from healthy seeds (i.e. seeds harvested from healthy plant panicles) and diseased seeds (i.e. seeds harvested from plant panicles with 7 to 9 disease score of sheath blight) and were sown both under green house (pots) and field conditions. The seedling growth assessed in terms of seedling vigour index at 21 days and 30 days after sowing. The germination percent, root and shoot length of individual seedlings also be measured. The results showed that the seedling vigor index was more in healthy plant seeds than the diseased plant seeds at both observation periods. They were also statistically significant. Highest percent germination of two varieties (81.75 and 88.75) were recorded when the seeds from healthy plants panicle. The root and shoot length were also affected in diseased plant seeds during the same period of observation. The seedling vigour index calculated clearly revealed that healthy plant seeds in both the varieties i.e., Swarna (2595.07) and Mahamaya (3681.14) was more than the corresponding diseased plant seeds (i.e., 1837.14 and 2762.62, respectively). The reduced growth of root, shoot and seedling vigour from diseased seeds showed that due to the survival of pathogen in diseased plant seeds and its transmission from seed to emerging seedlings, the Rhizoctonia solani pathogen is internally seed-borne in nature.
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