Systematic significance of pollen morphology of Shorea, Hopea, Parashorea and Neobalanocarpus (Dipterocarpaceae) in Malaysia

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Abstract

Palynology study was undertaken on 32 taxon of Malaysian Dipterocarpaceae belonging to four genera 'Shorea', 'Hopea', 'Parashorea' and 'Neobalanocarpus heimii', to investigate pollen morphology systematic significance at lower hierarchical levels. Results show that pollen morphology within these four groups is fairly uniform. There is no character that can really separate these four genera. However 'S. maxima' can be distinguished from other 'Shorea' by its crotonoid exine ornamentation and it could be a diagnostic character for this species. The colpate apertures and the closely comparable exine ornamentation confirm the homogeneity of this tribe. This is similar to the results reported by Erdtman (1952) and Maury et al. (1975). The presence of two types of pollen grain, tricolpate and tetracolpate, strongly suggests it corresponds to the species chromosome number or more specifically polyploidy. The results of this present study show that there are overlapping morphological characters in these two closely allied genera 'Hopea' and 'Shorea'. The pollen morphology in 'Hopea' shows an agreement with Ashton's classification (1982) at subspecies level. All species in 'Parashorea' show similarities in pollen morphology with an exception in 'P. tomentella' which is slightly different in exine ornamentation. This study has shown that pollen characters do not provide much information for systematic analysis especially at lower hierarchical levels except for genus 'Hopea'.

Original languageEnglish
Pages (from-to)169-176
Number of pages8
JournalSains Malaysiana
Volume37
Issue number2
Publication statusPublished - Jun 2008

Fingerprint

Neobalanocarpus
Parashorea
Hopea
Shorea
Dipterocarpaceae
Malaysia
pollen
exine
Neobalanocarpus heimii
Tomentella
palynology
polyploidy
chromosome number

Keywords

  • Dipterocarpaceae
  • Palynology
  • Pollen

ASJC Scopus subject areas

  • General

Cite this

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title = "Systematic significance of pollen morphology of Shorea, Hopea, Parashorea and Neobalanocarpus (Dipterocarpaceae) in Malaysia",
abstract = "Palynology study was undertaken on 32 taxon of Malaysian Dipterocarpaceae belonging to four genera 'Shorea', 'Hopea', 'Parashorea' and 'Neobalanocarpus heimii', to investigate pollen morphology systematic significance at lower hierarchical levels. Results show that pollen morphology within these four groups is fairly uniform. There is no character that can really separate these four genera. However 'S. maxima' can be distinguished from other 'Shorea' by its crotonoid exine ornamentation and it could be a diagnostic character for this species. The colpate apertures and the closely comparable exine ornamentation confirm the homogeneity of this tribe. This is similar to the results reported by Erdtman (1952) and Maury et al. (1975). The presence of two types of pollen grain, tricolpate and tetracolpate, strongly suggests it corresponds to the species chromosome number or more specifically polyploidy. The results of this present study show that there are overlapping morphological characters in these two closely allied genera 'Hopea' and 'Shorea'. The pollen morphology in 'Hopea' shows an agreement with Ashton's classification (1982) at subspecies level. All species in 'Parashorea' show similarities in pollen morphology with an exception in 'P. tomentella' which is slightly different in exine ornamentation. This study has shown that pollen characters do not provide much information for systematic analysis especially at lower hierarchical levels except for genus 'Hopea'.",
keywords = "Dipterocarpaceae, Palynology, Pollen",
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AB - Palynology study was undertaken on 32 taxon of Malaysian Dipterocarpaceae belonging to four genera 'Shorea', 'Hopea', 'Parashorea' and 'Neobalanocarpus heimii', to investigate pollen morphology systematic significance at lower hierarchical levels. Results show that pollen morphology within these four groups is fairly uniform. There is no character that can really separate these four genera. However 'S. maxima' can be distinguished from other 'Shorea' by its crotonoid exine ornamentation and it could be a diagnostic character for this species. The colpate apertures and the closely comparable exine ornamentation confirm the homogeneity of this tribe. This is similar to the results reported by Erdtman (1952) and Maury et al. (1975). The presence of two types of pollen grain, tricolpate and tetracolpate, strongly suggests it corresponds to the species chromosome number or more specifically polyploidy. The results of this present study show that there are overlapping morphological characters in these two closely allied genera 'Hopea' and 'Shorea'. The pollen morphology in 'Hopea' shows an agreement with Ashton's classification (1982) at subspecies level. All species in 'Parashorea' show similarities in pollen morphology with an exception in 'P. tomentella' which is slightly different in exine ornamentation. This study has shown that pollen characters do not provide much information for systematic analysis especially at lower hierarchical levels except for genus 'Hopea'.

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