Vinayan R
Effect of growth regulators on seed viabilty , germination and vigour of seedlings of Mangium and Rosewood - Vellanikkara Department of Tree Physiology and Breeding, College of Forestry 2000
The present study was undertaken at College of Forestry, Kerala Agricultural
University, Vellanikkara, Thrissur to find out the effect of plant growth regultors at
varying concentrations on seed germinatio~ and seedling vigour of Acacia mangium
and Dalbergia latifolia. Both fresh and stored seeds were treated with different
concentrations of IAA, GA and BA. The study revealed that seeds of Acacia mangium
could be stored for longer periods without deterioration of its viability and germination
capacity. The germination percentage of fresh seeds of Acacia mangium and
Dalbergia latifolia were 72 and 60 respectively. But in the case of Dalbergia latifolia,
the germination percentage of seeds went on decreasing with the increase in storage
periods. In Acacia mangium the seeds treated with 10 ppm GA and 100 ppm BA
showed better germination and also took minimum days for germination. However in
Dalbergia latifolia, IAA treatment recorded better germination with less number of days
taken for germination.
Seedling growth in the nursery showed that GA was highly eff~ctive in
increasing the height, girth and leaf production of seedlings of Acacia mangium. GA
at 100 ppm was found to be best in this regard. Higher root and shoot biomass of
seedlings were also recorded for GA followed by IAA. Seedlings of Dalbergia latifolia
recorded better height, girth and leaf production when seeds were treated with
100 ppm, IAA. Root and shoot biomass of the seedlings were more for 250 ppm, IAA
in Dalbergia latifolia. In both the species the chlorophyll content was not found to be
significantly influenced by any of the growth regulator treatment.
634.9 / VIN/EF
Effect of growth regulators on seed viabilty , germination and vigour of seedlings of Mangium and Rosewood - Vellanikkara Department of Tree Physiology and Breeding, College of Forestry 2000
The present study was undertaken at College of Forestry, Kerala Agricultural
University, Vellanikkara, Thrissur to find out the effect of plant growth regultors at
varying concentrations on seed germinatio~ and seedling vigour of Acacia mangium
and Dalbergia latifolia. Both fresh and stored seeds were treated with different
concentrations of IAA, GA and BA. The study revealed that seeds of Acacia mangium
could be stored for longer periods without deterioration of its viability and germination
capacity. The germination percentage of fresh seeds of Acacia mangium and
Dalbergia latifolia were 72 and 60 respectively. But in the case of Dalbergia latifolia,
the germination percentage of seeds went on decreasing with the increase in storage
periods. In Acacia mangium the seeds treated with 10 ppm GA and 100 ppm BA
showed better germination and also took minimum days for germination. However in
Dalbergia latifolia, IAA treatment recorded better germination with less number of days
taken for germination.
Seedling growth in the nursery showed that GA was highly eff~ctive in
increasing the height, girth and leaf production of seedlings of Acacia mangium. GA
at 100 ppm was found to be best in this regard. Higher root and shoot biomass of
seedlings were also recorded for GA followed by IAA. Seedlings of Dalbergia latifolia
recorded better height, girth and leaf production when seeds were treated with
100 ppm, IAA. Root and shoot biomass of the seedlings were more for 250 ppm, IAA
in Dalbergia latifolia. In both the species the chlorophyll content was not found to be
significantly influenced by any of the growth regulator treatment.
634.9 / VIN/EF