Prevalence of diseases and mycroflora associated with rice seeds and its impact on sowing seed quality

Simple item page
dc.contributor.advisorBhale, M.S.
dc.contributor.authorTeja, Tejavath Ramya
dc.date.accessioned2017-02-25T09:10:23Z
dc.date.available2017-02-25T09:10:23Z
dc.date.issued2016
dc.description.abstractRice (Oryza sativa L., Family : Poaceae) is an important staple food for more than 60% of the world population and its production has direct effect on food security. Worldwide, it is grown in 162 million hectare with an annual production of about 678.7 million tonnes. In India, rice covers 43.8 m ha area of which Madhya Pradesh occupies 14.9 m ha. In M.P. this area include 2.37 m ha under irrigated, 2.63 m ha under upland and 9.94 m ha under drought prone rainfed lowland agro-ecosystem. Present investigation entitled “ Prevalence of mycoflora associated with rice seeds and its impact on sowing seed quality” was aimed at identification of genetic resources resistant to diseases. The experimental material consisted of genetic stock of 30 rice varieties, 8 hybrids, 13 A lines, 13 NPT lines and 24 land races. Status of brown spot (Helminthosporium oryzae), sheath blight (Rhizoctonia solani), blast (Magnaporthe grisea), false smut (Ustilaginoidea virens), bunt (Tilletia barclayana) was determined in random plot survey method based on the field diagnostic symptoms with the help of available keys. Overall incidence of brown spot (Helminthosporium oryzae) and false smut (Ustilaginoidea virens) was up to 19% in 30 rice varieties screened. Sheath blight (Rhizoctonia solani) ranged highest of all with 49% in variety Mahamaya, however, 18 varieties showed no incidence of blast. Bunt ranged 0.01-0.03% in 7 varieties. Similar investigations were carried for 8 hybrids which showed that 2 hybrids had no incidence of false smut and 6 hybrids were free from bunt pathogen. Sheath blight incidence ranged highest (22%) in JRH 8, brown spot ranged up to 15%. No incidence of blast was noticed in any of hybrids. Out of the 13 A lines screened incidence of brown spot and sheath blight ranged highest with 13% and 12%, respectively in 3 A. False smut ranged up to 6%. 5 A lines had no incidence of brown spot, 3 lines free of Rhizoctonia solani pathogen, 4 lines had no incidence of false smut and 7 A lines free from bunt. Similarly 13 NPT lines were screened, in which it was found that NPT 19(S) line showed highest incidence of brown spot, blast and false smut with range 5%, 4% and 5% respectively. 24 land races from 6 different agro climatic zones of Madhya Pradesh were grown and screened, out of which 15 land races were free of brown spot and false smut, 20 free of blast, 13 free from sheath blight and 24 land races had no incidence of bunt. It was found that sheath bight and false smut incidence was highest which ranged up to 11% in Badalphool and Laxshmibhoog respectively. Brown spot ranged up to 7% in Dhubraj. Status of diseases were determined in six different locations around Jabalpur through random plot survey method during kharif 2015. It was found that variety Kranti was the most susceptible to all the seven diseases at different locations with highest range. In the similar set of conditions, effect of these mycoflora on sowing seed quality was detected from composite seed samples of healthy and diseased seeds. Association of Curvularia lunata (19%) exhibited 10.58 per cent reduction in seed germination and 8.98% reduction in seed emergence in variety Mahamaya. In variety Varalu association of Alternaria alternata (24%) showed 13.09% reduction in seed germination and 11.76% reduction in seed emergence. Similarly association of Fusarium moniliforme (17%) in JRH 5 resulted 18.60% and 16.27% reduction in seed germination and seed emergence, respectively. Whereas, similar association of mycoflora with 21% of initial seed infection in MTU 1081 showed 16.47% and 10.22% reduction in seed germination and seed emergence. Seeds of MTU 1081 showed high vigour (2262) followed by JRH 5 and 31 A (2055, 1921), respectively in healthy seeds, whereas in diseased seeds vigour of MTU 1081 was higher (1650) followed by 1400 and 1365 in JRH 5 and NPT 16, respectively.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810002588
dc.language.isoenen_US
dc.pages82en_US
dc.publisherJNKVVen_US
dc.subPlant Pathologyen_US
dc.subjectnullen_US
dc.themePLANT PATHOLOGYen_US
dc.these.typeM.Scen_US
dc.titlePrevalence of diseases and mycroflora associated with rice seeds and its impact on sowing seed qualityen_US
dc.typeThesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
T-83976.pdf
Size:
981.15 KB
Format:
Adobe Portable Document Format
Description:
Prevalence of diseases and mycroflora associated with rice seeds and its impact on sowing seed quality
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Theses