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Asian Journal of Agricultural Research

Year: 2011  |  Volume: 5  |  Issue: 5  |  Page No.: 250 - 259

Morphological and Molecular Variability in Weedy Rices of Haryana

N. Choudhary, U. Ahuja, V. Chawla, R.K. Jain, P. Kumari and K.R. Batan


Weedy rices commonly known as ‘red rices’, infest rice fields worldwide. They compete with rice for nutrients, deteriorate quality and are difficult to eradicate. Understanding their genetic diversity and the origin may prove helpful in designing an effective way for managing them. A collection of weedy rices from Haryana were evaluated along with cultivated and wild rices for variability and diversity at morphological and molecular level using 35 ISSR primers. Significant variation was observed at morphological and genetic level in weedy rices of Haryana. Weedy rices were found to be distinct from white and red type cultivated rices and wild strains. Twenty one ISSR markers gave amplification of DNA and a total of 91 polymorphic bands were found. With 9 ISSR markers 20 unique bands were observed in 17 genotypes. Markers such as Pr814, Pr836 and Pr858 produced unique bands in weedy rices only. Alleles unique to weedy rices observed by ISSR markers could be converted into SCAR markers for identification. Weedy rices were placed alone as well as with other groups in cluster analysis. Both short and long grain weedy rices were found in collection though at present only long grain types are cultivated indicating that leftover progenies of local cultivars segregated into various plant types giving rise to the weedy rice.

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