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Axial variations in vessel structure of bamboos Phyllostachys violascens ‘Prevernalis’ and Bambusa textilis
- WANG Xiao-Lin ,
- ZHOU Wei ,
- ZHAO Mei ,
- DING Yu-Tong ,
- YANG Dong-Mei ,
- ZHANG Yin-Shuang ,
- YIN Meng-Qi ,
- ZHUANG Yue ,
- PENG Guo-Quan
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- College of Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
Received date: 2023-04-11
Accepted date: 2023-12-21
Online published: 2024-01-22
Supported by
National Natural Science Foundation of China(31770647)
Abstract
Aims As a plant gets taller, the distance of water flow becomes longer and hydraulic resistance becomes bigger. Dicotyledons have evolved special xylem structure to compensate for the increase of hydraulic resistance to water transport with height growth by widening conduits downwards. However, monocots have no secondary growth and thus will limit the maintenance of xylem hydraulic efficiency during ontogeny. Therefore, it is important to figure out the axial changes of the hydraulic architecture of monocots, and investigate the maintenance mechanism of water transport efficiency of these plants and the reason for their wide distribution in nature.
Methods The vessel lumen size, vessel number, stem diameter, hydraulically weighted mean vessel diameter (Dh), mean vessel area, vessel density, vessel area/vessel density parameters at different heights along the stem of two arborescent bamboos, Phyllostachys violascens ‘Prevernalis’ and Bambusa textilis from Jinhua, Zhejiang Province were studied. Standardized major axis estimation (SMA) was used to analyze the changes of traits along the axis of stem, and the covariant relationship among the traits.
Important findings In both species, hydraulic diameter increased, vessel density decreased, and the ratio of vessel area to vessel density increased accordingly from the stem apex to the base. There was a significantly negative correlation between vessel density and vessel size. These results indicated that the size of vessels in bamboo gradually widens from the stem apex to the base, and the number of vessels in the unit cross sectional area of xylem gradually decreases. It is characterized by trade-off between changes in the size and number of vessels within stem. The results show insight on the growth adaptation strategies of monocotyledonous plants.
Key words： hydraulic limitation; axial variation; bamboo; vessel size; vessel density; trade-off
Cite this article
WANG Xiao-Lin , ZHOU Wei , ZHAO Mei , DING Yu-Tong , YANG Dong-Mei , ZHANG Yin-Shuang , YIN Meng-Qi , ZHUANG Yue , PENG Guo-Quan . Axial variations in vessel structure of bamboos Phyllostachys violascens ‘Prevernalis’ and Bambusa textilis[J]. Chinese Journal of Plant Ecology, 2024 , 48(7) : 915 -929 . DOI: 10.17521/cjpe.2023.0100
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