MOLECULAR CHARACTERIZATION, INHERITANCE AND VALIDATION OF MARKERS LINKED TO AROMA IN RICE (Oryza sativa L.) UNDER AEROBIC CONDITION
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Date
2008-06-15
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Rice (Oryza sativa L.) has a renowned relationship with the humans since
ages. India produces some of the best quality aromatic rices in the world, which
includes Basmati type and non-Basmati, short and medium grained type. Most of
the work on aromatic rice is concentrated mainly on basmati rice while, very
limited organized efforts have been made on the latter. Characterization of 24
aromatic rice genotypes revealed, none of the genotypes were superior in respect
of all the traits studied. Nevertheless, the genotype IET 18981 exhibited higher
grain yield per plant while, Kalanamak and K 44-1 were rich in iron and zinc
content. Correlation studies indicated highly significant and positive correlation of
grain yield with number of productive tillers per plant and number of tillers per
plant. The inter-cluster distance was not consistent with the geographic
distribution of varieties. The varieties belonging to diverse ecological regions
clustered together whereas, genotypes of the same region have entered widely into
separate groups. Contribution of each character towards genetic divergence
indicated that grain yield per plant contributed maximum towards the genetic
divergence. The results of molecular characterization revealed presence of
variation between basmati and non-Basmati genotypes for aroma. Most of the
Basmati genotypes were grouped to one cluster while, all the local non-basmati
genotypes were grouped to another cluster. The results of evaluation of F2
populations of three crosses developed viz., IRRI 38 x Jeerige sanna, BI 33 x
Jeerige sanna and Azucena x Moro mutant, indicated higher PCV, GCV,
heritability and genetic advance as per cent of mean for most of the characters.
The results of studies on inheritance pattern of aroma in all the three crosses
indicated that, the trait is governed by single recessive gene (3 non-aromatic: 1
aromatic). The results of single-marker analysis revealed the association of OPC
07 and RM 264 markers with aroma which explained 34 and 44 per cent of
variation in the respectively.
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