Effects of Daylength, Temperature, Light Intensity and Applied Growth Substances on the Growth, Flowering and Tuberization of Winged Bean (Psophocarpus Tetragonolobus (L.) Dc.)
The responses of vegetative growth, flowering and tuberization of a Malaysian selection (M 14/4) of winged bean (Psophocarpus tetragonolobus (L.) DC.) to daylength , aerial day/night temperature, light intensity and applied growth substance were investigated under growth cabinet, glasshouse and...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1983
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10204/1/FP_1983_1.pdf |
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| Summary: | The responses of vegetative growth, flowering and tuberization
of a Malaysian selection (M 14/4) of winged bean (Psophocarpus tetragonolobus
(L.) DC.) to daylength , aerial day/night temperature, light intensity
and applied growth substance were investigated under growth cabinet,
glasshouse and tropical field conditions.
Plants grown at reasonably optimum day/night temperatures of
26/18'c under growth-cabinet conditions were more vigorous in vegetative
growth with increase in daylength. However, with higher temperature
regimes, this daylength effect on vegetative growth was reversed.
Increase in daylength generally led to higher dry matter in the stem and
less to the leaf and root system. It also resulted in higher specific
leaf area and less total chlorophyll contentin the leaves. There was no
evidence from the present study of a thermoperiodic response. Reducing
the intensity of the natural daylight led to an increase in leaf area
ratio and consequently a higher relative growth rate up to a maximum of
about 45% of full natural light in tensity. Increase in nodulation was
also obtained with reduction in natural light intensity. Extension growth
was gene rally increased by application of GA and decreased by CCC and
phosphon without affecting dry matter redistribution between the various
plant organs.
Short days were necessary for both flower initiation and
development. A minimum number of leave s mus t have been formed on the
main axis before the plant can be induced to initiate flowers. |
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