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Pak. J. Bot., 47(5): 1759-1764, 2015.

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GENETIC VARIABILITY FOR MORPHOLOGICAL PARAMETERS IN F₂ SEGREGATING POPULATIONS OF RICE

AZIZ-UR-RAHMAN¹, SYED MEHAR ALI SHAH¹, HIDAYAT-UR-RAHMAN¹, IFTIKHAR HUSSAIN KHALIL¹, MUHAMMAD ISMAEEL¹, MIAN AHMAD RAZA¹AND IJAZ AHMAD KHAN²

Abstract: This study was conducted to evaluate genetic variation among four parents and their 12 F₂ populations for various morphological attributes at The University of Agriculture, Peshawar during 2012 rice crop growing season. Significant variation among the genotypes was manifested for all the traits studied. F₂ population Kashmir-Basmati/Kangni-27 manifested minimum days to heading (100) while the F₂ population Dilrosh/Kashmir-Basmati took minimum days to maturity (135). F₂ population Kashmir-Basmati /Dilrosh had the longest panicles (29.5 cm) while F₂ population Dilrosh/ Kashmir-Basmati excelled for number of primary (12.4) and secondary (35.9) branches panicle^-1.  Maximum broad sense heritability for panicle length (0.85), number of primary branches (0.87) and secondary branches (0.93) panicle^-1 was observed for F₂ populations Kashmir-Basmati/Dilrosh, Dilrosh/Kangni-27 and Kashmir-Basmati/TN-1, respectively. F₂ population Kashmir-Basmati /Dilrosh showed the highest genetic advance for panicle length (22%). F₂ population Dilrosh/Kangni-27 manifested maximum genetic advance (34.7%) for primary branches panicle^-1 while TN-1/ Kashmir-Basmati revealed the highest value (48.8%) of genetic advance for secondary branches panicle^-1.  The above mentioned segregating populations on account of better performance for maturity and panicle traits could be advanced further to develop desirable recombinant inbred lines and rice cultivars.

Key words: Rice; F₂ populations; Genetic variation; Broad sense heritability; Genetic advance, Maturity traits, Panicle traits.

¹Department of Plant Breeding and Genetics, The University of Agriculture Peshawar-Pakistan

²Department of Weed Science, The University of Agriculture Peshawar-Pakistan

^*Corresponding author e-mail: mehrpbg@gmail.com