Assessment of Diversity in Physiological Characters of Advanced  Breeding Lines of Rice (Oryza sativa L)

Bacterial Leaf Blight disease epidemically damaged the rice crop. Absence of resistance against BLB disease in MTU1010 is one of the main reason for these epidemics. Thus, there is urgent need to search for resistant source and subsequently, their phenotypic evaluation to validate the resistant source. In this paper discussing about the highlights of phenotypic evaluation of Bacterial Leaf Blight resistance in MTU1010 NIL variety of rice. In the present study, fifty advanced breeding lines along with parents i.e., MTU1010 NIL X Akshayadhan NIL, were screened for bacterial leaf blight disease, Thirty-four breeding lines were shown resistance against bacterial leaf blight disease.

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Study of fertility restoration and genetic diversity of drought-tolerant breeding lines for hybrid rice (Oryza sativa L.) development

Journal of Crop Science and Biotechnology ◽

10.1007/s12892-021-00112-6 ◽

2021 ◽

Author(s):

Vijayata Singh ◽

Rahul Priyadarshi ◽

Akhilesh Kumar Singh ◽

Abhinav Jain

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Hybrid Rice ◽

Oryza Sativa L ◽

Fertility Restoration ◽

Breeding Lines ◽

Drought Tolerant

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Genetic divergence and clustering studies in advanced breeding lines of rice (Oryza sativa L.)

Electronic Journal of Plant Breeding ◽

10.37992/2020.1102.084 ◽

2020 ◽

Vol 11 (02) ◽

Keyword(s):

Oryza Sativa ◽

Genetic Divergence ◽

Oryza Sativa L ◽

Breeding Lines

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Combination of traits at two developmental stages under salt stress as a measure of tolerance in a reciprocally crossed rice (Oryza sativa) population

Crop and Pasture Science ◽

10.1071/cp19560 ◽

2020 ◽

Vol 71 (4) ◽

pp. 334 ◽

Cited By ~ 2

Author(s):

Sabrina M. Elias ◽

M. Sazzadur Rahman ◽

Sumaiya F. Khan ◽

Sudip Biswas ◽

Taslima Haque ◽

...

Keyword(s):

Oryza Sativa ◽

Salt Stress ◽

Reciprocal Cross ◽

Developmental Stages ◽

Oryza Sativa L ◽

Principal Component ◽

Maturity Stage ◽

Salt Tolerant ◽

Rice Varieties ◽

Breeding Lines

The rice (Oryza sativa L.) landrace Horkuch from Bangladesh maintains efficient photosynthesis and detoxification under salt stress and was therefore considered to be a useful donor for tolerance traits. Reciprocally crossed bi-parental mapping populations were generated from salt-tolerant Horkuch and high-yielding salt-sensitive variety IR29, in order to identify superior salt-tolerant high-yielding lines as donors. The present study reports on the phenotypic screening data of ~300 F3 segregating populations from the reciprocal cross and their parental lines in seedlings and screening of a subset at maturity stage under gradual salt stress of 12 dS m–1 for seedlings and 8 dS m–1 for mature plants. Correlation, broad-sense heritability and principal component analyses for salt tolerance as well as yield-related traits were conducted in the populations at the two developmental stages. Level of salt injury was found to be correlated with traits such as filled grain weight at maturity stage and biomass-related traits at the seedling stage. This association between yield-related and survival traits helped to identify tolerant and sensitive plants, which were predicative of agronomic performance under salt stress. Moreover, use of the reciprocal-cross population showed how cytoplasmic inheritance of specific traits such as K+ concentrations can affect characteristics of donor plants. Measurement of a large number of traits and analysis of their co-inherited interrelation can therefore help identify the best performing plants under salt stress for effective breeding strategies. The data are being utilised in mapping of quantitative trait loci, and selected progenies are being used as breeding lines for producing durable salt-tolerant, high-yielding rice varieties.

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