Characterization of advance breeding lines for morphophysiological traits and bacterial blight resistance in rice (Oryza sativa L.)

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dc.contributor.advisorMangat, G.S.
dc.contributor.authorSumuni, Simeo Marco
dc.date.accessioned2020-11-02T04:50:34Z
dc.date.available2020-11-02T04:50:34Z
dc.date.issued2020
dc.description.abstractThe present study was conducted at Punjab Agricultural University, Ludhiana and its Regional Research Station at Patiala during Kharif 2019 to evaluate a set of 43 advance breeding lines of rice developed from diverse crosses for various yield attributes and quality traits in different agro climatic zones of the Punjab state. These were also screened for resistance to different pathotypes of bacterial blight (BB). The breeding lines showed significant variation for various agro-morphological, yield, quality attributes viz. days to 50% flowering, plant height (cm), ear bearing tillers (EBT) /m2 , grain yield per plot, thousand grain weight (g), SPAD Value, spikelet fertility (%), harvest index, total rice recovery (%), head rice recovery (%) and chalkiness (%) as well as reaction to BB. On overall basis, genotypes PAU 6707-33-6-1-1-1-3, PAU 6998-110-3-1, PAU 6522-23-2-1-1-2, PAU 6554-1-1-1-2-3, PAU 6231-49-1-4-2-1, PAU 6994-90-3-1 and PAU 6251-6-1-3-3-1 performed better over both the locations. The genotype PAU 6707-33-6-1-1-1-3 had the highest average yield. It is early maturing, semi dwarf with good tillering ability, high SPAD value, high spikelet fertility along with desirable quality traits. It is resistant to all ten pathotypes of BB presently prevalent in the Punjab state and possesses three BB resistant genes Xa4, xa13 and Xa21.The breeding lines were also characterized for known bacterial blight resistance genes (Xa4, Xa5, xa13 and Xa21) using molecular markers. A total of 37 genotypes, out of 43 genotypes tested were completely resistant to all the ten pathotypes (PbXo-1 to PbXo-10).Out of the 43 lines tested, 12 and 22 lines showed presence of three and two gene combination, respectively. Eight lines showed presence of single gene while one line (PAU 5285-23-1-2) showed none of the known gene tested. Among the three gene combination presence of Xa4+xa13+Xa21 and for two gene combination presence of xa13+Xa21 was most prevalent. None of the lines showed all the four genes tested in combination. The study was thus useful in identifying new high yielding, BB resistant genotypes of varying maturity with acceptable grain quality suitable for Punjab conditions. The molecular characterization of these lines indicated that the genotypes carrying 2 or 3 pyramided BB resistance genes would provide durable resistance.en_US
dc.identifier.citationSumuni, Simeo Marco (2020). Characterization of advance breeding lines for morphophysiological traits and bacterial blight resistance in rice (Oryza sativa L.) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810154078
dc.keywordsBacterial blight, gene pyramiding, milling quality, Oryza sativa, pathotypes, resistance gene and yield.en_US
dc.language.isoEnglishen_US
dc.pages70en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemCharacterization of advance breeding lines for morphophysiological traits and bacterial blight resistance in rice (Oryza sativa L.)en_US
dc.subGenetics and Plant Breedingen_US
dc.themeCharacterization of advance breeding lines for morphophysiological traits and bacterial blight resistance in rice (Oryza sativa L.)en_US
dc.these.typeM.Scen_US
dc.titleCharacterization of advance breeding lines for morphophysiological traits and bacterial blight resistance in rice (Oryza sativa L.)en_US
dc.typeThesisen_US
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