Abstract
Dormancy-breaking and seed germination studies in genus Lilium reveal that the majority of Lilium spp. studied have an underdeveloped embryo at maturity, which grows inside the seed before the radicle emerges. Additionally, the embryo, radicle or cotyledon has a physiological component of dormancy; thus, Lilium seeds have morphophysiological dormancy (MPD). A previous study suggested that seeds of Lilium polyphyllum have MPD but the study did not investigate the development of the embryo, which is one of the main criteria to determine MPD in seeds. To test this hypothesis, we investigated embryo growth and emergence of radicles and epicotyls in seeds over a range of temperatures. At maturity, seeds had underdeveloped embryos which developed fully at warm temperature within 6 weeks. Immediately after embryo growth, radicles also emerged at warm temperatures. However, epicotyls failed to emerge soon after radicle emergence. Epicotyls emerged from >90% seeds with an emerged radicle only after they were subjected to 2 weeks of cold moist stratification. The overall temperature requirements for dormancy-breaking and seed germination indicate a non-deep simple epicotyl MPD in L. polyphyllum.
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Acknowledgements
We are thankful to the G. B. Pant Institute of Himalayan Environment and Development, India, for financial support. We are also grateful to IM Hopton-Scott, Editor, RHS LILY GROUP Newsletter, for her review of the manuscript for English language.
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MS received 20 March 2012; accepted 19 October 2012
Corresponding editor: R Geeta
[Dhyani A, Phartyal SS, Nautiyal BP and Nautiyal MC 2013 Epicotyl morphophysiological dormancy in seeds of Lilium polyphyllum (Liliaceae). J. Biosci. 38 1–7] DOI 10.1007/s12038-012-9284-5
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Dhyani, A., Phartyal, S.S., Nautiyal, B.P. et al. Epicotyl morphophysiological dormancy in seeds of Lilium polyphyllum (Liliaceae). J Biosci 38, 13–19 (2013). https://doi.org/10.1007/s12038-012-9284-5
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DOI: https://doi.org/10.1007/s12038-012-9284-5