59 research outputs found
Production of Fungal Chitosan by Enzymatic Method and Applications in Plant Tissue Culture and Tissue Engineering: 11 Years of Our Progress, Present Situation and Future Prospects
A Review of the Fundamental Structure of Area or a Contribution to the Theory of Development of Area with a Paticular Reference to the Distributions of Lilium and its Related Groups. (1)
A Review of the Fundamental Structure of Area or a Contribution to the Theory of Development of Area with a Paticular Reference to the Distributions of Lilium and its Related Groups. (2)
新しい植物像の探求 Cardiocrinum 属の種分化と生活史
Cardiocrinum属は,ヒマラヤ(北緯約30度)から樺太(北緯約50度)にわたって分布する属である。著者は1950年代から現在に至る半世紀を超える研究の歩みをふりかえり,生活史の進化の視点から,同属の種分化と地理分布に関する,現在の到達点を述べた。C. giganteumの半ロゼツトは草本の原始的形態であるが,C. cathayanumは新しく,大型草本との背伸び競争に対応した偽輪生の体制を獲得した点で大きな意義を有する。C. cordatum は日本(沖縄及び北海道を除く)に分布し,C. cathayanumによく類似した分類群である。前者は,日本の代表的な森林植生類型である照葉樹林と夏緑樹林と,それらが優占する地域にそれぞれ,分化を遂げている。北海道以北を主な分布域とするC. glehniiは,高緯度地域への同属の分布拡大にともなう,地上部の生活期間短縮を原因とする幼形成熟的形態であり,生物学的種としての固有性を認めるべきである。生活史・生活環の一般的研究は,その重要性にもかかわらず,種子植物領域においては,理論的にも具体的調査においても,未だ不十分な段階にある。しかし,その展望は大きいものがあり,種分化の研究に大きく貢献する。著者は生活環の当面する基礎的問題について,若干の提案をおこなった。The genus Cardiocrinum (Liliaceae) widely distributes from Himlaya (ca. 30 N°) to Sakha-lin (ca. 50 N°). Here, I traced my research history on the genus over the half century from 1950s to the present, as well as stated my opinions on diversification and phytogeography of the genus in light of the life history. Semi-rosette foliage system found in C. giganteum would be primitive in the genus, while it should be noted that C. cathayanum acquired a false vertecillode foliage which would be advan-tageous in competition with large herbs. Cardio-crinum cordatum, distributed in Japan except for Okinawa and Hokkaido, morphologically re-sembles to C. cathayanum. Cardiocrinum corda-tum would be diversified independently in the laurel forests, summer green forests and non-forested areas adjacent to these forests. Cardio-crinum glehnii mainly distributed in Hokkaido and Sakhalin represents a distinct species with a paedomorphic form in which aerial growth would be arrested. This strategy is adaptive in higher-latitudinal areas where favorable season for growth (i.e., summer) is shorter than in lower-latitudinal areas. Despite life history/cycle is obviously important to characterize a plant, such researches on seed plants are not suf-ficiently conducted both in empirical and theo-retical levels. I proposed some solutions to over-come the prevailing problems in studies on life histories/cycles. Especially, I hope this report summarizing my researches would stimulate fu-ture studies on life histories/cycles which would contribute to clarifying a speciation process.2017 年度 植物地理・分類学会賞記念講演記
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