Anatomical Characters of Needle Leaves of Hard Pines Native to Taiwan Relevant to Taxonomy
| Autor: | Hsiu-Chin Chang, 張秀琴 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Pinus massoniana Lambert and P. taiwanensis Hayata are indigenous hard pines (Pinus) in Taiwan with very similar morphology which leads to extreme difficulty for identification and raises a long standing debate on whether P. massoniana is native to Taiwan. The needle anatomical characters of the old herbarium specimens identified as P. massoniana and hard pines from five populations (the Coastal Range, Huoyan Mt., Junjianyan, Kunyang, and Wulu) in Taiwan were examined, in order to provide a taxonomic reference. The external resin duct in the needle leaf was further classified to marginal and sub-marginal resin ducts based on the sheath cells missing. Based on this classification, P. massoniana showed only marginal resin duct in its needle leaves. Pinus taiwanensis showed a mixture of medial and sub-marginal resin duct types. These resin duct patterns are consistently found in young needle leaves observed from Huoyan Mt. and Junjainyan. Only 10 of 34 old specimens are P. massoniana, and five of them are labled as cultivated. The other five specimens were collected from northern Taiwan, the further information about cultivated or natural growing were absent. Seventeen needle anatomical traits of the five populations were examined biometrically by cluster analysis and canonical discriminant analysis. The hard pines of Kunyang and Junjainyan were distinguished from other three populations in fifteen traits by the scatterplot of the first two canonical variables. The results suggested that the hard pine from Junjianyan could be differentiated from other populations by the variables: the number of sheath cells and resin ducts (nSh, nRD), the depth of sheath cell (dSh), the width of needle cross section (wCs), and the distance of leaf margin to endodermis (MEn). The hard pines from the Coastal Range, Huoyan Mt., and Wulu are highly similar in their needle anatomical features, but they can be differentiated from those of Kunyang by the variables: the width and depth of epistomatal (wEpSt, dEpSt), the width of endodermis (wEn), the depth and width of needle cross section (dCs, wCs). Based on these results, the population of Junjaiyan afforested during 1923-1934 is the currently known P. massoniana in Taiwan, and the populations from the Coastal Range and Huoyan Mt. previously acknowledged as P. massoniana are not this species. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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