Phaseolus coccineus. Average length of periods in continuous darkness (DD), as calculated from diurnal leaf movements |
1a: plants from seeds of parental plant a; 1b plants from seeds of parental plant b
(P = parental generation). 2: F1 and F2 generations of cross a x b. The length of periods comprise 23 hours (a), 26 hours (b) and 25 hours in the F1 und F2 - hybrids (E. BÜNNING, 1932).