EFFECT OF PRE SOWING SEED TREATMENTS AND BIOREGULATORS ON GERMINATION PERFORMANCE OF Vitex negundo L.
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Date
2016
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UHF,NAUNI,SOLAN
Abstract
ABSTRACT
The present investigation entitled “Effect of pre sowing seed treatment and growth bioregulators on
germination performance of Vitex negundo L.” was conducted in laboratory and nursery of the Department of
Silviculture and Agroforestry, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan-173230
(HP) during 2015-2016. Vitex negundo (L.) is a medically important shrub /small tree belong to the family
verbenaceae.There is enormous biotic pressure on this shrub species and natural regeneration is poor. Vitex
negundo L. can be easily propagated through stem cuttings and root suckers. Propagation through seeds is
hindered due to its poor viability. Seed is reported to possess double dormancy i.e. embryo dormancy in addition
to a mechanical dormancy imposed by an impermeable seed coat. A very little information is available
concerning the germination of this species. Therefore, the objective of the present study was to examine the
effect of different treatments and bioregulators on the germination of Vitex negundo. The freshly harvested
seeds were stratified in sand. Three batches of seed were placed for stratification at 15 days interval for 15, 30
and 45 days at two different temperature viz. 0±1oC and room temperature. Gibberellic acid was applied at three
different concentrations (100ppm, 200ppm and 300ppm) including control. Kinetin was also applied at three
different concentrations (100ppm, 200ppm and 300ppm) including control. In another experiment effect of
various pre-sowing treatments was studies under nursery conditions. From the present investigation it is
concluded that a stratification period of 30 days at 0±1oC temperature followed by soaking in 200 ppm of
gibberellic acid excelled over other treatments and registered maximum germination percent (12%), germination
energy (6.67%), germination capacity (14%), mean daily germination (0.26) and peak value (0.44). Besides this
stratification period of 30 days at room temperature followed by soaking in 200 ppm of kinetin was found to be
best for other kinetin treatments. It was observed that the gibberellic acid proved better for seed germinability as
compare to kinetin.
Among different pre-sowing seed treatments the seeds treated with cow urine registered significantly
maximum germination percent (8%), germination energy (6.33%), germination capacity (13.00%), mean daily
germination (0.11) and peak value (0.18). The seed sown in potting mixture consisting of sand, soil and FYM in
1:1:1 ratio (M4) registered maximum seedling growth and biomass production parameters.
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