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Journal of Medicinal Plants
Research Vol. 6(8), pp.1455-1460,
29 February, 2012
DOI: 10.5897/JMPR11.409
ISSN 1996-0875 ©2012 Academic
Journals |
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Full Length
Research Paper |
Morphology and histochemistry of the glandular trichomes of
Isodon rubescens (Hemsley) H. Hara
[Lamiaceae]: A promising medicinal plant of China
Meng-qi Liu1, Zhen-wen Liu2* and Jing
Zhou2,3
1School
of Pharmaceutical Sciences,
Henan University of Traditional Chinese Medicine,
Zhengzhou, 450008, China.
2Key
Laboratory of Biodiversity and Biogeography, Kunming
Institute of Botany, Chinese Academy of Sciences, Kunming
650204, China.
3School
of Pharmaceutical science, Kunming Medical University, No.
191 West Renmin Rd. Kunming 650031, China.
*Corresponding author. E-mail:
liuzw@mail.kib.ac.cn
or
Zhoujing0902@hotmail.com.
Accepted 8 September, 2011
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Abstract |
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Isodon rubescens,
a perennial herb indigenous to China, with medicinal
application, potentially has economic value. The morphology of
the glandular trichomes was investigated with light microscopy.
At the same time the chemical content was analyzed by applying
chemical reagents and fluorescence microscopy. This
morphoanatomical and histochemical study revealed that leaves of
I. rubescens possess one type of non-glandular and two
types of glandular trichomes, with the latter differing both
anatomically and in the composition of their secondary
metabolites. Non-glandular trichomes were uniseriate with an
ornamented surface. Peltate and capitate glandular trichomes
comprised one basal cell, one stalk cell and one head. The head
of mature peltate glandular trichomes consisted of four-twelve
secretory cells while that of the capitate glandular hairs was
comprised of two cells. Peltate glandular trichomes containing
compounds of terpenoid nature are probably the main site of
oridonin and ponicidin accumulation. The fluorescent stain of
peltate and capitate glandular trichomes indicated the possible
presence of phenolic compounds.
Key
words:
Isodon rubescens, Lamiaceae, glandular trichomes,
microscopy, histochemistry, terpenoids, phenolic. |
