| Abstract: | Lemna paucicostata Hegelm. 6746, a short-day plant, flowers even under continuous light when CuSo4, AgNO3, K3[Fe(CN)6], or benzoic acid are added to the medium, or when blue light is given exclusively. All other strains tested, including strain 371, did not flower under any of these conditions. Crossing between strains 371 (♀) and 6746 (♂) produced some seeds, although the reciprocal crossing did not. None of the hybrids flowered in response to AgNO3, or blue light, and only a few flowered in response to CuSO4. Most of the hybrids, on the other hand, flowered in response to K3[Fe(CN)6] or benzoic acid, although the responses were lower than the mean of the parental. Further analysis could not be made because self-pollination or crossing between the hybrids did not produce any seeds. However, since sensitivities to the above 5 factors were passed on to the F1 hybrids in varying degrees, the extraordinary high sensitivities to these factors of strain 6746 are considered to be governed by different genes. Otherwise, a single (or a few) gene(s) governing the sensitivities to these factors would be differently expressed in the hybrids. |
