EFFECT OF' SEED VIGOUR ON MORPHO- PHYSIOLOGICAL TRAITS AND FIELD PERFORMANCE IN DIFFERENT RICE GENOTYPES
Loading...
Files
Date
2004
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Professor Jayashankar Telangana State Agricultural University
Abstract
The effect of seed vigour on morpho~physiological traits and field performance in different rice genotypes was studied both in laboratory and field. Laboratory studies were conducted at Department of Seed Science and Technology, College of Agriculture, Rajendranagar, and Seed Testing laboratory (Department of Agriculture, Government of Andhra Pradesh) Rajendranagar, Hyderabad while field studies were conducted at National ' Seed Project, Rajendranagar, Hyderabad d&ng Kharif, 2002. The field experiment was laid out in Split Plot Design, replicated thrice with 25 different rice genotypes as main treatments and four sub-treatments of accelerated ageing days viz., A. = control without accelerated ageing, A1 = accelerated ageing of seed for three days; A2 = accelerated ageing of seed for six days and A3 = accelerated ageing of seed for nine days. All 25 rice genotypes belonging to early indicas, late ikdicas, japonicas sad indica hybrid groups were subjected to accelerated ageing by keeping them in environmental chamber at 40rt1°C and 95&5% relative humidity and tests were conducted with aged seeds after drying back them to their normal moisture content of 12 per cent germination per cent and after accelerated ageing among the genotypes. Irrespective of genotypes the germination percent, seedling vigour indespeed of germination, seed density gradually decreased with the increase in period of accelerated ageing (3 to 9 days). The electrical conductivity of the seed leachates were high with accelerated ageing treatments when compared with control. Kernellhusk ratio and 1000-seed weight were not significantly affected by the accelerated ageing treatments. Crop raised from the seed subjected to accelerated ageing recorded reduced plant height, plant dry weight, number of productive tillers, number of filled grains per panicle besides extending the days to 50 per cent flowering and finally resulted in reduced yield. There was also increase in sterility per cent in almost all the genotypes with increase in number of days of accelerated ageing treatments. However, the response of early, late indicas, japonicas and hybrids differed with accelerated ageing. This amply suggests that vigour has pronounced effect on crop growth, plant stand and final yield. However, varietal differences have been clearly amplified through accelerated or artificial ageing treatments.
Description
Keywords
null
Citation
D7085