Genetic improvement of resistance to blast and bacterial blight of the elite maintainer line Rongfeng B in hybrid rice (Oryza sativa L.) by using marker-assisted selection

Significant variations were obtained among the component lines for most of the floral traits. BRRI9A exhibited superiority for angle of open florets, stigma length and breadth, anther breadth, filament length, style length and panicle exertion rate while its corresponding maintainer lines BRRI9B showed superiority for duration of open florets, stigma length and breadth, anther breadth and filament length. This indicated BRRI9A and its corresponding maintainer line BRRI9B possessed very good floral traits that influence out crossing. Among the restorer lines BR168R showed superiority for duration of open florets, angle of open florets, duration of bloomed florets/panicle, stigma length, anther length and number of pollen/microscopic focus. This suggested BR168R could be used as promising restorer line with BRRI9A for hybrid seed production in local condition.DOI: http://dx.doi.org/10.3329/bjb.v43i1.19739 Bangladesh J. Bot. 43(1): 1-8, 2014 (June)

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Influence of varying levels of zinc on yield and zinc biofortification in hybrid rice (oryza sativa L.) grown in moderate zinc soil

Journal of the Indian Society of Soil Science ◽

10.5958/0974-0228.2021.00034.7 ◽

2021 ◽

Vol 69 (2) ◽

pp. 220-223

Author(s):

Kiran Kumar Mohapatra ◽

Satish Kumar Singh ◽

Abhik Patra

Keyword(s):

Oryza Sativa ◽

Hybrid Rice ◽

Oryza Sativa L

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Studies on Effect of Age of Seedling and Levels of Nitrogen on Performance of Hybrid Rice (Oryza sativa L.)

International Journal of Bio-resource and Stress Management ◽

10.23910/ijbsm/2019.10.4.2008 ◽

2019 ◽

Vol 10 (4) ◽

pp. 382-388

Author(s):

Govinda Kumar ◽

◽

Shivasankar Acharya ◽

S. K. Pathak ◽

Sunil Kumar ◽

...

Keyword(s):

Oryza Sativa ◽

Hybrid Rice ◽

Oryza Sativa L ◽

Effect Of Age

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Genetic diversity analysis in indigenous rice (Oryza sativa L.) germplasm for Bacterial Leaf Blight (Xanthomonas oryzae pv. Oryzae) using resistance genes linked markers

10.21203/rs.3.rs-217763/v1 ◽

2021 ◽

Author(s):

Khannetah K. R . ◽

Ramchander S. ◽

Andrew Peter Leon M. T ◽

Shobha D. ◽

Saravanan S. ◽

...

Keyword(s):

Oryza Sativa ◽

Resistance Genes ◽

Bacterial Blight ◽

Rice Yield ◽

Oryza Sativa L ◽

Molecular Data ◽

Lesion Length ◽

R Genes ◽

Leaf Clipping ◽

Moderately Resistant

Abstract Among rice ( Oryza sativa L.) diseases, bacterial blight (BB), caused by Xanthomonas oryza pv. Oryzae , plays a pivotal role in decreasing rice yield. BB is reported to be the most serious constraint to improving rice yield. The present investigation assessed the potentiality of bacterial blight resistance and molecular characterization of 100 rice accessions for four major BB resistance genes, viz., Xa4, xa5, xa13 and Xa21 . Disease screening was carried out under glasshouse conditions using a BB culture isolated from BB-infected rice fields through the leaf clipping method. Analyses of 13 BB resistance genes linked with polymorphic microsatellites markers indicated the presence of single-, two-, three- and four-gene combinations of xa5, xa13, Xa4 and Xa21 . We found four accessions to be resistant; 34 accessions to be moderately resistant; 49 accessions to be moderately susceptible and 13 accessions to be susceptible. Among the resistant lines, IR12L110, Namcheonbyeo, Dhalaheera and SahbhagiDhan recorded a minimum lesion length of 3.7cm, 4.2cm, 4.67cm and 8.3 cm, respectively. Phylogenetic tree, constructed using molecular data, grouped the rice germplasm into four major clusters. R genes xa 5 and Xa4 contributed 14 positive compatible R genes, each belonging to 28 germplasm for BB resistance. The potential genetic resources identified as resistant to BB can be used as donors for the improvement of rice BB resistance in rice breeding programs.

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