Germination studies on seeds of trichilia emetica and vangueria infausta
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Date
1998
Authors
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Publisher
Sokoine University of Agriculture
Abstract
The effect of various physical seed coat scarifications and chemical
treatments were
studied to determine presowing prescriptions that would
ensure uniform, fast and high germination in seeds of Trichi Iia emetica
and Vangueria infausta.
The studies involved eight 3x5 factorial model
experiments arranged in a randomized block design with with 4 blocks
each.
For each of the two species, two different experiments were conducted
in the laboratory and repeated in the nursery.
The first experiment of Tri chi Iia erne t i ca involved 3 types of physical
seed coat scarification and soaking the seeds in gibberellic acid
(CA3) at 5 concentrations; i.e. 0, 250, 500, 750, and 1000 ppm.
A second
experiment involved 3 types of physical seed coat scarification and
soaking the seeds in potassiun nitrate (KNO^) at 5 concentrations; i .e.
0.0, 0.2, 0.4,0.6 and 0.8%.
The first study involving Vangueria infausta included 3 types of
physical seed coat scarification and treatments of the seed with 5
concentration levels of hydrogen peroxide (H202); i .e. 0, 2, 4, 6
and 8%.
In the second experiment, 3 types of physical seed coat scarifi-
cation and soaking the seeds in 5 concentration levels of indole acetic
acid (IAA); i.e. 0, 25, 50, 75 and 100 ppm were studied.
Unscarified seeds of Trichi Iia emetica (without chemical treatment) atta
ined cumulative germination of 29% and 35%, while seeds with complete
removal of both the aril and the seed coat attained cunulative germination
of 94s and 93« in the laboratory and nursery experiments respectively.
Description
Masters in Forestry
Keywords
Seed, Trichi Iia emetica, Vangueria infausta