摘要:
研究了红树科Rhizophoraceae的木榄Bruguiera gymnorrhiza、海莲Bruguiera sexangula、角果木Ceriops tagal和秋茄Kandelia candel;马鞭草科Verbenaceae的白骨壤Avicennia marina;紫金牛科Mysinaceae的桐花树Aegiceras corniculatum和海桑和Sonneratiaceae的海桑Sonneratia caeseolaria次生木质部的结构与进化关系,红树科植物的次生木质部结构比马鞭草科、紫金牛科和海桑科的植物原始;红树科中的竹节树属Carallia和山红树属Pellacalyx为陆生的非红树植物,它们次生木质部结构比海生的红树料红树植物木榄属、秋茄属、角果木属更为进化,即导管为单穿孔、管间纹孔式为互利式纹孔.单穿孔的导管存在,是长期的进化过程中,遇到干旱环境而产生的特化现象,而海生红树科植物进入海滩沼译后,木质部仍具有原始性状.
Abstract:
A study on the relation between the evolution and structure of secondary xylem of the mangrove Bruguiera sexangula,B.uguiera gymnerrhixa,Ceriops tagal and Kandelia candel (Rhizophoraceae).Avicennia marina (Verbenaceae),Aegiceras eorniculatum (Mysinaceae) and Sonneratia caeseolaria (Sonneratiaceae) is made.The results are shown as follows:Secondary xylem of mangrove species in Rhizophoraceae is more primitive than those of mangrove species in Verbenaceae,Mysinaceae and Sonneratiaceae,Carallia and Pellacalyx belong to Rhizophoraceae of terrestrial plants but are not mangrove species and they have more evolutionary secondary xylem,namely,simple perforation vessel and alternate pit-pair,than mangrove species such as Bruguiera,Ceriops and Kandelia (Rhizophoraceae).The form of simple perforation vessel is a specialization phenomenon in dry environment during the long evolution.But the secondary xylem characteristics of mangrove species in Rhizophoraceae remained primitive,after they entered the seashore wetlands.
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