Changes in ploidy affect vascular allometry and hydraulic function in Mangifera indica trees.

Autor: Barceló-Anguiano M; Institute for Mediterranean and Subtropical Horticulture 'La Mayora' - CSIC - UMA, Avda. Dr. Wienberg s/n, Málaga, 29750, Spain., Holbrook NM; Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts, 02138, USA., Hormaza JI; Institute for Mediterranean and Subtropical Horticulture 'La Mayora' - CSIC - UMA, Avda. Dr. Wienberg s/n, Málaga, 29750, Spain., Losada JM; Institute for Mediterranean and Subtropical Horticulture 'La Mayora' - CSIC - UMA, Avda. Dr. Wienberg s/n, Málaga, 29750, Spain.; Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts, 02138, USA.
Jazyk: angličtina
Zdroj: The Plant journal : for cell and molecular biology [Plant J] 2021 Oct; Vol. 108 (2), pp. 541-554. Date of Electronic Publication: 2021 Sep 03.
DOI: 10.1111/tpj.15460
Abstrakt: The enucleated vascular elements of the xylem and the phloem offer an excellent system to test the effect of ploidy on plant function because variation in vascular geometry has a direct influence on transport efficiency. However, evaluations of conduit sizes in polyploid plants have remained elusive, most remarkably in woody species. We used a combination of molecular, physiological and microscopy techniques to model the hydraulic resistance between source and sinks in tetraploid and diploid mango trees. Tetraploids exhibited larger chloroplasts, mesophyll cells and stomatal guard cells, resulting in higher leaf elastic modulus and lower dehydration rates, despite the high water potentials of both ploidies in the field. Both the xylem and the phloem displayed a scaling of conduits with ploidy, revealing attenuated hydraulic resistance in tetraploids. Conspicuous wall hygroscopic moieties in the cells involved in transpiration and transport indicate a role in volumetric adjustments as a result of turgor change in both ploidies. In autotetraploids, the enlargement of organelles, cells and tissues, which are critical for water and photoassimilate transport at long distances, point to major physiological novelties associated with whole-genome duplication.
(© 2021 The Authors. The Plant Journal published by Society for Experimental Biology and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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