SEM Observations and Measurements of Vestured Pits of the Secondary Xylem in the Tribe Rhizophoreae
? These authors contributed equally to this paper
Received date: 2013-12-16
Accepted date: 2014-11-13
Online published: 2015-04-09
We used SEM to investigate the distribution and micromorphology of vestured pits in the secondary xylem of 10 species and one variety representing all 4 genera within the tribe Rhizophoreae. Richness indexes of intervascular vestured pits and quantitative features of scalariform intervascular bordered pits were measured on SEM images by use of Carnoy 2.0. Vestured pits were present in vessel elements and tracheary elements of secondary xylem of the specimens and varied considerably in distribution and micromorphology. Stepwise regression analysis of richness indexes and quantitative features of scalariform intervascular bordered pits indicated increased richness indexes, including frequency of vestured vessel inner aperture, outer aperture and pit chamber with increasing aperture fraction, which suggests that richness of intervascular vestured pits was associated with the geometric structure of scalariform intervascular bordered pits. We demonstrate consistent occurrence of intervascular vestured pits in the tribe Rhizophoreae from the common presence of intervascular vestured pits in our specimens. In terms of ecophylogeny, vestured pits occurring in the vessel elements and tracheary elements of the secondary xylem of the tribe Rhizophoreae might be an ecologically adaptive character controlled by phylogeny.
Chuanyuan Deng, Guiliang Xin, Wanchao Zhang, Suzhi Guo, Qiuhua Xue, Zhongxiong Lai, Luying Ye . SEM Observations and Measurements of Vestured Pits of the Secondary Xylem in the Tribe Rhizophoreae[J]. Chinese Bulletin of Botany, 2015 , 50(1) : 90 -99 . DOI: 10.3724/SP.J.1259.2015.00090
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