Cytoembryology of some Malaysian dipterocarps, with some evidence of apomixis |
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| Authors: | A KAUR K JONG V E SANDS E SOEPADMO |
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| Institution: | Centre for Foundation Studies in Sciences, University of Malaya, Kuala Lumpur, Malaysia;Department of Botany, University of Aberdeen, Aberdeen;Department of Genetics and Cellular Biology, University of Malaya, Kuala Lumpur, Malaysia;Department of Botany, University of Malaya, Kula Lumpur, Malaysia |
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| Abstract: | KAUR, A., JONG, K., SANDS, V. E. & SOEPADMO, E., 1986. Cytoembryology of some Malaysian dipterocarps, with some evidence of apomixis. Embryological and cytological studies on some members of the Dipterocarpaceae were undertaken. Of the dipterocarps investigated 83% were diploids. Two new polyploids were observed, namely Shorea resinosa (2 n = 3x = 21) and Hopea subalata (2 n = 3x = 21). Multiple seedlings were observed in H. subalata, Shorea agami, S. argentifolia, S. ovalis, S. pauciflora and S. resinosa. For the first time embryological studies have conclusively demonstrated reproduction by agamospermy in 5. ovalis and S. agami. Considerable evidence leads to the inference that H. subalata, S. resinosa and 5. macroptera are also agamosperms. Each of these produces multiple seedlings. Of these apomictic species three are polyploids, namely S. ovalis (2 n = 4x = 28), H. subalata (2 n = 3x = 21) and S. resinosa (2 n = 3x = 21), whereas S. agami (2 n = 14) and S. macroptera (2 n = 14) are diploids. |
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| Keywords: | Cytology Dipterocarpaceae embryology outbreeding |
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