Coordination of intertracheid pit traits and climate effects among cycads

Pang, Yu-Kun; Qin, Lan-Li; Zhang, Tianhao; Lei, Jin-Yan; Zhang, Ya; Roddy, Adam B.; Jiang, Guo‐Feng

doi:10.1111/ppl.13924

Cited by 3 publications

(1 citation statement)

References 73 publications

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“…Changes in pit traits can also influence the hydraulic safety and efficiency trade-off of plant xylem. A larger pit membrane area but lower pit density within individual cycad plants may provide higher hydraulic efficiency, which affects the hydraulic trade-off between safety and efficiency [97]. Although it has been shown that the structure of the pit affects the hydraulic trade-off, the exact mechanism underlying this is not clear.…”

Section: Tree Heightmentioning

confidence: 99%

Trade-Off between Hydraulic Safety and Efficiency in Plant Xylem and Its Influencing Factors

Li,

Wang,

et al. 2023

Forests

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Forests are vital ecosystems that are increasingly threatened by environmental stress; exploring the possible trade-off between hydraulic safety and efficiency in plant xylem is crucial to understanding their environmental adaptation strategies. However, to date, there is no consensus whether such trade-offs exist among and within species. To better comprehend the mechanism of xylem water transport, in this review, we summarized previously published work on xylem hydraulic safety and efficiency trade-off from the inter-species, intra-species, and intra-tree perspectives and its influencing factors. We gathered data on xylem hydraulic safety and efficiency and their related anatomical traits, i.e., conduit diameter and inter-conduit pit membrane thickness, from a total of 653 plant species analyzed in 80 published papers. At the inter-species level, we confirmed that there is a weak hydraulic safety and efficiency trade-off. For gymnosperms and herbaceous species, the observed trade-off is stronger. At the intra-species level, the hydraulic safety and efficiency trade-off was found in individuals of the same species investigated in the literature. At the intra-tree level, there is a trade-off between hydraulic safety and efficiency for leaves, stems, and roots, and we confirmed the vessel widening hypothesis, i.e., vessel diameter in the outer wood increases from the top to the bottom of the tree. Additionally, pit membrane thickness increases as the tree height decreases, thus increasing the xylem hydraulic efficiency and affecting the trade-off. Finally, we discussed the environmental factors affecting the trade-off between hydraulic safety and efficiency in the xylem, such as plant habitats, temperature, rainfall, altitude, and soil. Further investigations of the bordered pit membrane from the three-dimensional perspective would be useful to understand the hydraulic safety and efficiency trade-off at the nanoscale.

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Section: Tree Heightmentioning

confidence: 99%

Trade-Off between Hydraulic Safety and Efficiency in Plant Xylem and Its Influencing Factors

Li,

Wang,

et al. 2023

Forests

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Vessel, intervessel pits and vessel-to-fiber pits have significant impact on hydraulic function under different drought conditions and re-irrigation

Liu,

Gao

et al. 2023

Environmental and Experimental Botany

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Limited effects of xylem anatomy on embolism resistance in cycad leaves

Jiang,

Qin,

Pang

et al. 2024

New Phytologist

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Summary Drought‐induced xylem embolism is a primary cause of plant mortality. Although c. 70% of cycads are threatened by extinction and extant cycads diversified during a period of increasing aridification, the vulnerability of cycads to embolism spread has been overlooked. We quantified the vulnerability to drought‐induced embolism, pressure–volume curves, in situ water potentials, and a suite of xylem anatomical traits of leaf pinnae and rachises for 20 cycad species. We tested whether anatomical traits were linked to hydraulic safety in cycads. Compared with other major vascular plant clades, cycads exhibited similar embolism resistance to angiosperms and pteridophytes but were more vulnerable to embolism than noncycad gymnosperms. All 20 cycads had both tracheids and vessels, the proportions of which were unrelated to embolism resistance. Only vessel pit membrane fraction was positively correlated to embolism resistance, contrary to angiosperms. Water potential at turgor loss was significantly correlated to embolism resistance among cycads. Our results show that cycads exhibit low resistance to xylem embolism and that xylem anatomical traits – particularly vessels – may influence embolism resistance together with tracheids. This study highlights the importance of understanding the mechanisms of drought resistance in evolutionarily unique and threatened lineages like the cycads.

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Coordination of intertracheid pit traits and climate effects among cycads

Cited by 3 publications

References 73 publications

Trade-Off between Hydraulic Safety and Efficiency in Plant Xylem and Its Influencing Factors

Trade-Off between Hydraulic Safety and Efficiency in Plant Xylem and Its Influencing Factors

Vessel, intervessel pits and vessel-to-fiber pits have significant impact on hydraulic function under different drought conditions and re-irrigation

Limited effects of xylem anatomy on embolism resistance in cycad leaves

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