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The taxonomic significance of pollen morphology in Andromedeae s.s., Gaultherieae, Lyonieae and Oxydendreae (Ericaceae: Vaccinioideae)

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Title: The taxonomic significance of pollen morphology in Andromedeae s.s., Gaultherieae, Lyonieae and Oxydendreae (Ericaceae: Vaccinioideae)
Other Titles: ツツジ科スノキ亜科のヒメシャクナゲ連,シラタマノキ連,ネジキ連,オキシデンドラム連における花粉形態の分類学的意義
Authors: SARWAR, A. K. M. Golam1 Browse this author
TAKAHASHI, Hideki2 Browse this author →KAKEN DB
Authors(alt): サルワル, A. K. M. ゴラム1
高橋, 英樹2
Keywords: Andromedeae s.s.
pollen morphology
taxonomic significance
Issue Date: 31-Dec-2006
Publisher: 日本花粉学会
Journal Title: 日本花粉学会会誌
Journal Title(alt): Japanese Journal of Palynology
Volume: 52
Issue: 2
Start Page: 77
End Page: 96
Abstract: The pollen morphology of 41 species in 12 of the 13 genera constituting tribes Andromedeae s.s., Gaultherieae, Lyonieae and Oxydendreae of Ericaceae, subfamily Vaccinioideae, was investigated with light (LM) and scanning electron microscopy (SEM). The pollen of the species included in these tribes is stenopalynous: 3-colopor (oid) ate grains in oblate permanent tetrads. Pollen characteristics do not show notable correlation with the tribal classification, although it is observed that the pollen tetrads tend to be compact in Andromedeae s.s., Gaultherieae and Oxydendreae, but usually lobed in Lyonieae, especially in Lyonia. The compact tetrads of tribe Andromedeae are characterized by a thin, perforated septum. Apocolpial exine sculpture of individual grains within the pollen tetrad varies from psilate to coarsely rugulate, the rugulae have a 'secondary sculpture' of faint to well-defined fine or coarse striae. Two main R and S types, six subtypes and seven sub-subtypes of exine are recognized based on the primary sculpture and distinctness of secondary sculpture on the rugulae. A continuous series of variation in both qualitative and quantitative characters of the pollen was observed within all four tribes. Sometimes exine sculpture shows little variation in some genera within these tribes; e.g. Leucothoe (S2 and S2**) within the tribe Gaultherieae, and Agarista (R2-3 and R4) and Lyonia (R3, R3* and R3**) within the tribe Lyonieae. Exine sculpture, degree of tetrad compactness, tetrad size and septum thickness proved to be the most useful characters for helping to clarify the infrageneric classification in Gaultheria, Agarista and Lyonia. An exine surface with secondary striate sculpture is apparently characteristic of subfamily Vaccinioideae, based on our general palynological survey of the Ericaceae.
ヒメシャクナゲ連,シラタマノキ連,ネジキ連,オキシデンドラム連を構成する13属のうち12属・41種の花粉形態を光学顕微鏡と走査型電子顕微鏡で観察した.これら4連の花粉は3溝孔(類孔)型・偏球形の花粉粒からなる四集粒という点で共通し,ステノパリナス(狭範花粉型)であった.花粉形態形質はこれら連のレベルでの分類システムと明瞭に対応しているという訳ではなかったが,ヒメシャクナゲ連,シラタマノキ連,オキシデンドラム連の四集粒においては,各花粉粒は通常密に合着しているが,ネジキ連(特にネジキ属)の四集粒では各花粉粒が遠心極側に突出している種が多い.密に合着しているヒメシャクナゲ連の四集粒はセプタム(隣接する4花粉粒間の壁)が薄く穿孔がある点で特徴づけられる.各連の遠心極域の外壁表面模様は粗いしわ模様型から平滑型まで変異し,しわにある「二次模様」は縞模様で,その縞模様は不明瞭から明瞭なものまで,微細なものから粗いものまである.表面模様全体と二次模様の明瞭さに基づいて,外壁は2つの主型:R型とS型,6亜型,さらに7つのより下の型に分けられた.しかし,各連の中においてはこれら外壁表面模様や定量的な花粉形質は連続的につながって変異していた.それでも時に外壁表面模様はある属でほとんど変化がなく安定している:イワナンテン属(S2とS2**型),アガリスタ属(R2-3とR4型)やネジキ属(R3, R3*, R3**型).外壁表面模様とともに,四集粒の合着程度やサイズ,セプタムの厚さ等の花粉形態形質は,シラタマノキ属,アガリスタ属,ネジキ属などの属内分類体系を明らかにする上で有効な形質であることが分かった.これまでのツツジ科全体の花粉形態研究を基にすると,二次的な縞模様を持った外壁表面はスノキ亜科全体を特徴づける花粉形質と思われる.
Type: article (author version)
Appears in Collections:総合博物館 (The Hokkaido University Museum) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Sarwar, A.K.M. Golam

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