DUS characterization and assessment of seed dormancy and storage behaviour of aromatic short grain rice varieties
Loading...
Date
2021-08-26
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Seed Science and Technology, OUAT, Bhubabneswar
Abstract
Aromatic rice (Oryza sativa L.) varieties are preferred world-wide since ages because of the
excellent aroma and palatability. More than hundreds of traditional land races of aromatic rice with
pleasant aroma are being cultivated in different parts of Odisha. But the farmers are not growing
these varieties because of low yield and lack of marketing facilities. Now, realising the demand in
the market, to improve the economy of farmers, an investigation was carried out DUS
characterization and assessment of seed dormancy and storage behaviour of aromatic short grain
rice varieties for documentation and crop improvement. Thirty aromatic short grain rice varieties
were selected from the rice germplasm of Rice Research Station, O.U.A.T, Bhubaneswar and were
grown there during kharif 2016 and 2017 in RBD with three replications. The varieties were
characterized by 57 (43qualitative+14quantitative) morphological descriptors adopted from the
DUS guidelines of PPV and FR Authority, Govt. of India. Among the 43 qualitative traits the
spectrum of variability in 30 aromatic short grain rice varieties indicated that traits were 22
monomorphic, 9 dimorphic and 12 polymorphic indicating their potential for varietal
characterization and distinctiveness. No intra-varietal variation was observed for any of the visual
characteristics. Among the 14 quantitative traits used for characterization 9 exhibited dimorphic
and 5 polymorphic patterns of variation. Among the rapid chemical tests standard phenol test and
modified phenol test with copper sulphate was found effective in differentiating aromatic short
grain rice varieties. Further KOH and NaOH test were useful in identification of aromatic short
grain rice varieties. However, not much significant response has been noticed due to added
chemicals like GA3 and 2,4-D. Intensity of dormancy varied from 46 % (Dhanaprasad) to 96%
(Dulhabhog) of non-germinated seeds on the day of harvest. The duration of dormancy in 30
aromatic short grain rice varieties ranged from 14 to 42 days with an initial germination percentage
of 46 to 96, when they were tested immediately after harvest. Based on, this dormancy was
classified as weak (7-14 days) 2 varieties (Dhanaprasad and Kanak champa), moderate(14-21days)
11 varieties, strong (21-28 days) 10 varieties, very strong (28-35 days) 6 varieties and extremely
strong (35-42days) 1 variety (Dulahabhog). In storage studies among 30 aromatic short grain rice
varieties Dulahabhog and Nua Kalajeera was showed highest seed quality parameters after 12
months of storage with minimum 82 per cent of germination up to seven months of storage.