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Research articles

ScienceAsia 44(2018): 146-161 |doi: 10.2306/scienceasia1513-1874.2018.44.146

Pollen morphology and leaf anatomy of genus Globba in Thailand

Pornpun Kajornjita, Surapon Saensoukb,c, Piyaporn Saensouka,b,*

ABSTRACT:     Pollen morphology was investigated in 22 taxa of the genus Globba (Zingiberaceae) from Thailand by means of light microscopy and scanning electron microscopy. The pollen grains of all taxa examined are monad, radially symmetric, apolar, and inaperturate. The sizes of the pollen grains are medium and large. The pollen grains have various shapes: oblate-spheroidal, spheroidal, and prolate-spheroidal. The exine ornamentation is short-echinate with psilate between the spine, short-echinate with rugulate between the spine, and psilate. The two types of spine apex are blunt and sharp. Palynological data has not been useful at the specific level. The leaf anatomy of 26 taxa was investigated by epidermal peeling and transverse sections of the leaves. The results indicate that the significant leaf anatomical characteristics for species identification are types of stomata, types of trichome, number of rows in intercostal regions, position of hypodermis, shape of midrib, types of vascular system, shape of midrib and leaf margins in transverse sections, and cell inclusion. Based on these anatomical characteristics, an identification key for Globba at the species level is given for the first time.

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a Department of Biology, Faculty of Science, Mahasarakham University, Mahasarakham 44150 Thailand
b Plant and Invertebrate Taxonomy and its Application Research Unit, Faculty of Science, Mahasarakham University, Mahasarakham 44150 Thailand
c Walai Rukhavej Botanical Research Institute, Mahasarakham University, Mahasarakham 44150 Thailand

* Corresponding author, E-mail: pcornukaempferia@yahoo.com

Received 24 Nov 2017, Accepted 1 Jul 2018