| dc.description | The extraction of useful chemicals from plants has a number of potential benefits
from a sociological perspective. The major societal benefits would include
substitution of domestically produced commodities for petroleum and other
imports, thereby alleviating balance of payments problems; more productive use
of resources, particularly in marginal farming areas; and diversification of the
Bangladesh agricultural system, which would permit market expansion without
farmer dependence on increasingly expensive and politically problematic
subsidies from traditional commodity programs. Some degree of government
subsidy and other forms of intervention probably will be required to stimulate
farm and industrial level plant extracts industries; such government intervention
may be greatly preferable to export subsidies for food grains, feed grains, and
other agricultural commodities in light of problems of aggravated balance of
payments deficits and the farm recession. | en_US |
| dc.description.abstract | The experiment was conducted to study the growth regulatory activities of some leaves
of ornamental plants on okra in pot condition. Different leaf extracts of ornamental
plants viz., Parrot tree (Butea monosperma), Mussaenda (Mussaenda erythrephytta),
Mast Tree (Polyanthia longifolia), Thuja (Thuja orientalis) and Hiptage (Hiptage
madablota) were used as experimental treatments. The experiment was laid out in a
single factor randomized complete block Design (RCBD) with five replications.
Observation was made on parameters like days to first germination (G;), time of 50%
germination (Ts0), co-efficient of germination, vigor index, germination index,
germination percentage and seedling growth like shoot length and root length. In general,
most of the leaf extracts showed faster seed germination and seedling growth. Okra seeds
started to germinate within 3 days with the leaf extract of Parrot tree that is faster
germination occurred with Parrot tree leaf extract. Similarly completion of 50%
germination taken lowest days (3.65 days) than other treatments. Slower germination
and 50% germination was found with control. Coefficient of germination, vigor index,
germination index and final germination percentage perform better with the leaf extract
of Parrot tree than others and produced the highest value that is 34.92%, 52.83, 14.60
and 96.80%, respectively. In those cases control showed the lowest values. In case of
shoot length and root length increased with the days after sowing (DAS). At 10 DAS, 15
DAS, 20 DAS, 25 DAS and 30 DAS both shoot length and root length gave the highest
values with the leaf extract of Parrot tree and control gave the lowest values. After thin
layer chromatography distinctly four compounds designated as C;, C2, C3 and Cy, for
chloroform extract at Hexane: Ethylacetate (5:1 v/v) and Pj, Po, P3 and P, for ethanol
extract at Alcohol: Ethylacetate (3:1 v/v) was showed by TLC (Thin Layer
Chromatography) of chloroform extract and ethanol extract of Parrot tree (Butea
monospema) .Here the intensity of non-polar compound like C; and polar compound like
P,was too much high comparison with others. The results in this experiment indicate
that the aqueous extracts of different plant species have growth regulatory activity on
germination parameters and growth parameters like shoot length and root length on okra
vegetable. | en_US |
