Abstract
Long days and high temperatures changed the growth habit of the normally determinate lablab bean ( Lablab purpureus) plant to indeterminate. The critical daylength for the change was 13 h at 25 °C and between 10 and 11 h at 30 °C. No change in habit occurred at 20 °C in any daylength, indicating the existence of a minimum temperature for the change. Plants of indeterminate growth habit showed an increased number of nodes and a greater length of internodes. It is suggested that daylength affects internode length rather than number of nodes, while the main factor determining number of nodes seems to be temperature.
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