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Allele mining across two low-P tolerant genes PSTOL1 and PupK20-2 reveals novel haplotypes in rice genotypes adapted to acidic soils

Published online by Cambridge University Press:  08 December 2015

Julia S. Yumnam
Affiliation:
School of Crop Improvement, College of Post-Graduate Studies, Central Agricultural University, Umroi Road, Umiam, Meghalaya793 103, India
Mayank Rai
Affiliation:
School of Crop Improvement, College of Post-Graduate Studies, Central Agricultural University, Umroi Road, Umiam, Meghalaya793 103, India
Wricha Tyagi*
Affiliation:
School of Crop Improvement, College of Post-Graduate Studies, Central Agricultural University, Umroi Road, Umiam, Meghalaya793 103, India
*
*Corresponding author. E-mail: wtyagi.cau@gmail.com

Abstract

About 40% of the global arable land is acidic, and in India, majority of these acidic soils are in the north-eastern region. Soil acidity leads to high phosphorus (P) fixation that causes P deficiency; therefore, there is a need to characterize the identified potential donors for acidic soils for P-deficiency tolerance. We evaluated rice genotypes for nucleotide variation in two loci reported for low P tolerance, namely PSTOL1 and PupK20-2. Sequence comparison for PSTOL1 revealed two distinct haplotypes. Genotypes with higher P uptake such as LR 19 and LR 23 had the desired Kasalath-type haplotype, whereas those with lower P uptake such as UR 29 and LR 39 showed a mixed haplotype. A total of four novel nucleotide variations were observed in 3′-UTR (untranslated region). Sequencing of PupK20-2 revealed a total of 28 SNPs and one insertion–deletion, of which 24 SNPs were novel. The discovery of novel SNPs across both PSTOL1 and PupK20-2 suggests the existence of novel haplotypes in genotypes adapted to acidic soil conditions. We reported for the first time the characterization of the donors being used in breeding programmes for acidic soils at the molecular level. The implications in breeding programmes are discussed.

Type
Research Article
Copyright
Copyright © NIAB 2015 

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