Comparative observation on vessel elements and perforation plates in four species of Annonaceae
Annonaceae is the largest family of Magnoliales in the basal angiosperms. In recent years, some studies of wood anatomy and vessel have been done,but most of the studies are about Annona,and the researches of other genera are few,so the morphology of vessels and perforation plates of many species in the family are unknown. The wood of Polyalthia laui,Desmos chinensis,Uvaria grandiflora, and Fissistigma oldhamii from Annonaceae were collected from Hainan Province of China.Fixation of the healthy and fresh wood of each species was done using FAA(Formalin Acetic Acid)and materials were treated with Jeffrey's Fluid. The authors observed the vessel elements in the secondary xylem of the four species under the scanning electron microscope(SEM)and their vessel elements were compared.The features of vessel elements and the perforation plates in the four species under SEM were shown for the first time,and their differ-ences were illustrated. Statistical analysis about the length and diameter of vessel elements was made, too. The results showed that the perforation plates of the four species were all simple perforation plates,with or without tails.There were obvious differences in morphology of vessel elements. Vessel elements of Polyalthia laui were long and its perforation plates were oblique. Perforation plates of Desmos chinensis were truncated,and its vessel elements were shorter,and its diameter was the biggest in four species. Perforation plates of Uvaria grandiflora were oblique and vessel. Vessel ele-ments of Fissistigma oldhamii were shortest and its perforation plates were truncated,no tail or with a small tail.The sta-tistical analysis of length and diameter of vessel element showed that the differences of four species are significant. The correlation analysis of length and diameter showed that they were irrelevant.In the synthesis of factors,vessel elements of Desmos chinensis were shorter,and its diameter was the biggest in the four species,and its simple perforation plates were truncated,no tail or with a small tail.The authors think that the vessel of D.chinensis has higher level of evolution than the others. The results of this paper will provide new and more evidences for anatomy and systematics of Annonaceae.
国家科技期刊平台
NSTL
万方数据
维普
