Imperforate tracheary elements and vessels alleviate xylem tension under severe dehydration: insights from water release curves for excised twigs of three tree species
| Autor: | Akiko Takenouchi, Naoko Miki, Kenji Fukuda, Makoto Watanabe, Hiroyuki Tobita, Haruhiko Taneda, Daisuke Kabeya, Shin-Taro Saiki, Kenichi Yazaki, Mayumi Y. Ogasa, Delphis F. Levia, Michio Oguro |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
capacitance Cercidiphyllum Cercidiphyllum japonicum Plant Science Abies firma Biology Quercus serrata 010603 evolutionary biology 01 natural sciences Trees cryo‐SEM Quercus Xylem Botany Genetics Humans Ecology Evolution Behavior and Systematics Research Articles Dehydration Water micro focus x‐ray CT water storage Interspecific competition biology.organism_classification Droughts Transpiration stream xylem structure Abies 010606 plant biology & botany Woody plant Research Article |
| Zdroj: | American Journal of Botany |
| ISSN: | 1537-2197 0002-9122 |
| Popis: | Premise Water stored in the xylem of woody plants is important for supporting the transpiration stream under prolonged drought, yet the source of stored water within the xylem during drought remains unclear. Insights into xylem water utilization during drought will uncover the adaptation strategies of the test species to stress. Methods To fill the existing knowledge gap, we excised twigs of Abies firma (Japanese fir, conifer), Cercidiphyllum japonicum (katsura tree, diffuse-porous) and Quercus serrata (konara oak, ring-porous) to quantify interspecific variation of water transfer in xylem corresponding with increasing cumulative water release (CWR) using micro x-ray computed tomography and cryo-SEM. Results For all species studied, the main components of water storage within the operating range of water potential were not living cells but cavitation release and capillaries. Abies firma maintained water in the earlywood-like cells, for possible maintenance of the transpiration stream. Cercidiphyllum japonicum maintained water in its vessels over 200 kg m-3 of CWR, while Q. serrata lost most of its water in vessels with increasing CWR up to 100 kg m-3 . Cercidiphyllum japonicum exhibited a higher water storage capacity than Q. serrata. Under high CWR, narrow conduits stored xylem water in C. japonicum and imperforate tracheary elements in Q. serrata. Conclusions Among the species examined, increasing CWR appears to indicate differential utilization of stored water in relation to variation of xylem structure, thereby providing insight into the interspecific responses of tree species to drought. |
| Databáze: | OpenAIRE |
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