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In silico analysis of the fragrance gene (badh2) in Asian rice (Oryza sativa L.) germplasm and validation of allele specific markers

Published online by Cambridge University Press:  30 January 2020

Withanage Vidyani Erandika Withana ,
Rathanyaka Maudiyanselage Ramesha Eshani Kularathna ,
Nisha Sualri Kottearachchi Open the ORCID record for Nisha Sualri Kottearachchi [Opens in a new window] ,
Deepthika S. Kekulandara ,
Jagath Weerasena  and
Katherine A. Steele
Withanage Vidyani Erandika Withana
Affiliation:
Department of Biotechnology, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila (NWP), 60170, Sri Lanka
Rathanyaka Maudiyanselage Ramesha Eshani Kularathna
Affiliation:
Department of Biotechnology, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila (NWP), 60170, Sri Lanka
Nisha Sualri Kottearachchi*
Affiliation:
Department of Biotechnology, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila (NWP), 60170, Sri Lanka
Deepthika S. Kekulandara
Affiliation:
Rice Research and Development Institute, Batalagoda, Sri Lanka
Jagath Weerasena
Affiliation:
Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Kumaratunga Munidasa Mawatha, Colombo03, Sri Lanka
Katherine A. Steele
Affiliation:
School of Natural Sciences, Bangor University, Bangor, GwyneddLL57 2UW, UK
*
*Corresponding author. E-mail: nisha@wyb.ac.lk, kottearachchins@yahoo.com
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Abstract

Badh2 of rice is considered to be the major gene responsible for the fragrance in rice. The wild type badh2 allele encodes betaine aldehyde dehydrogenase 2 (BADH2) enzyme while the mutated version of badh2 gene encodes non-functional BADH2 enzyme that leads to the accumulation of 2-acetyl-1-pyrroline (2AP), the principal fragrant compound in rice. There are many mutated recessive alleles causing fragrance in global rice germplasm, although the badh2.1 allele present in Basmati type rice is the most well-known among breeders. In this study, we attempted to reveal potential fragrance causing mutations, and the respective varieties carrying them, through in silico analysis based on the sequences available in the Rice SNP-Seek-Database of International Rice Research Institute. The sequences of 1878 rice accessions from 22 countries were analysed to identify mutations in each exon of badh2 comparatively with the non-fragrant ‘wildtype’ GenBank sequence in Nanjing11, Oryza sativa indica (EU770319.1). Results revealed that 63 varieties from 12 countries possessed the most prevalent allele, badh2.1 having an 8 bp deletion and three single nucleotide polymorphisms in the 7th exon. The second most prevalent allele in genotypes from Asia was badh2.7 having a ‘G’ insertion in the 14th exon. A novel allele with a T deletion in 9th exon was detected in a Thai rice accession. Rice varieties containing either badh2.1 or badh2.7 alleles could be identified with DNA markers for badh2.1 (frg) and badh2.7 (Bad2.7CAPS). The marker, Bad2.7CAPS, co-segregated with the fragrance phenotype in two crosses, confirming the possibility of employing it in marker assisted breeding.

Keywords

aromatic ricebioinformaticsmarker assisted selectionplant breeding
Type
Research Article
Information
Plant Genetic Resources , Volume 18 , Issue 2 , April 2020 , pp. 71 - 80
Copyright
Copyright © NIAB 2020

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