Vol. 7 (3) : May-June 2016 issue
Green Farming Vol. 7 (3) : 537-540 ; May-June, 2016
Evaluation of landraces of rice (Oryza sativa L.) for genetic diversity
E. UMARANIa1*, K. RADHIKAa2, V. PADMAb3 and L.V. SUBBARAOc4
aDepartment of Genetics and Plant Breeding, bDepartment of Crop Physiology, College of Agriculture, Rajendranagar,
cCrop Improvement Section, Indian Institute of Rice Research, Rajendranagar, Hyderabad - 500 030 (Telangana)
Designation : 1Ph.D Scholar *(umaranierrabelli@gmail.com), 2Assoc. Professor, 3Professor, 4Principal Scientist
Subject : Crop Genetics and Plant Breeding
Paper No. : P-4037
Total Pages : 4
Received : 31 July 2015
Revised accepted : 14 April 2016
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Citation :
E. UMARANI, K. RADHIKA, V. PADMA and L.V. SUBBARAO. 2016. Evaluation of landraces of rice (Oryza sativa L.) for genetic diversity. Green Farming Vol. 7 (3) : 537-540 ; May-June, 2016
ABSTRACT
In the present investigation an attempt was made to estimate the genetic diversity among seventy landraces of rice using Mahalanobis D2 analysis which revealed the existence of considerable diversity among the genotypes. Based on the relative magnitude of D2 values, the experimental material was distributed into nine clusters. Out of nine clusters, cluster I was the largest comprising of fifty landraces. Total number of grains panicle-1, decorticated grain length, 100-grain weight, amylose content, time of heading and stem length together contributed maximum (94.16 %) to the total genetic divergence. A wide range of variation was observed in cluster means for all the traits under study. Maximum inter cluster distance was exhibited between clusters VIII and IX followed by clusters V and IX. The greater the distance between two clusters, the wider the genetic diversity among the genotypes of these clusters. Hence hybridization between the landraces from these clusters would produce high heterotic recombinants.
Key words :
Clusters, Cluster means, D2 analysis, Genetic diversity, Landraces, Rice.