SEED TECHNOLOGICAL INVESTIGATIONS IN DICOCCUM WHEAT [Triticum dicoccum (Schrank.) Suhulb.] VARIETIES
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Date
2001-08-03
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Field experiments were conducted at the Main Research Station, Dharwad
during rabi seasons of 1997-98 and 1998-99 to determine the'physiological maturity in
dicoccum wheat varieties by adopting randomised block design with five replications. The
laboratory experiments were conducted on various aspects viz., standardisation of
requirement of temperature and substrates, storability studies with*(pe of halogens,
dehusking methods on seed quality parameters, estimation of total phenols in the husk of
dicoccum wheat varieties. Observations were recorded on germination, speed of
germination, root length, shoot length, seedling length, vigour index, electrical conductivity
of seed leachates and field emergence.
The physiological maturity indices viz., dry weight, germination per cent,
seedling length and vigour index were maximum at 35 days after anthesis (DAA) in DDK-
1001 and DDK-1009, 40 DAA in DDK-1013 and 45 DAA in NP-200 and decreased
thereafter. The moisture content of seeds decreased from 5 to 50 DAA. The husked seeds
tested in between paper at 20°C recorded significantly higher values for all the seed quality
parameters, except the speed of germination. During storage, the effect of halogen
treatments was found more pronounced from 2nd month onwards and recorded significantly
higher seed quality attributes with lower EC values. The husked seeds treated with iodine
and stored in polythene bag registered higher values for germination (> 85%) during 12
months of storage.
Dehusking by hand recorded significantly higher values for seed quality
parameters. The total phenol content in the husk was significantly higher in DDK-1001
followed by NP-200, DDK-1009 and DDK-1013. Increasing the husk extracts from 2-8 per
cent decreased all the seed quality parameters and the inhibition of germination was highest
in DDK-1001, while it was lowest in DDK-1013.
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