Genome size variation in Cape schoenoid sedges (Schoeneae) and
its ecophysiological consequences

J 2024

Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences

VAN MAZIJK, Ruan; Adam G. WEST; G. Anthony VERBOOM; Tammy L ELLIOTT; Petr BUREŠ et al.

Základní údaje

Originální název

Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences

Autoři

VAN MAZIJK, Ruan; Adam G. WEST; G. Anthony VERBOOM; Tammy L ELLIOTT; Petr BUREŠ a A. Muthama MUASYA

Vydání

American Journal of Botany, St Louis, Botanical Soc Amer Inc, 2024, 0002-9122

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10611 Plant sciences, botany

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.700

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/24:00139518

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Cape Floristic Region; Cyperaceae; functional traits; fynbos; genome size; polyploidy; stomatal size; water-use efficiency

Štítky

14314020, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 11. 9. 2024 15:17, Mgr. Lucie Jarošová, DiS.

Anotace

V originále

PremiseIncreases in genome size in plants-often associated with larger, low-density stomata and greater water-use efficiency (WUE)-could affect plant ecophysiological and hydraulic function. Variation in plant genome size is often due to polyploidy, having occurred repeatedly in the austral sedge genus Schoenus in the Cape Floristic Region (CFR), while species in the other major schoenoid genus in the region, Tetraria, have smaller genomes. Comparing these genera is useful as they co-occur at the landscape level, under broadly similar bioclimatic conditions. We hypothesized that CFR Schoenus have greater WUE, with lower maximum stomatal conductance (gwmax) imposed by larger, less-dense stomata.MethodsWe investigated relationships between genome size and stomatal parameters in a phylogenetic context, reconstructing a phylogeny of CFR-occurring Schoeneae (Cyperaceae). Species' stomatal and functional traits were measured from field-collected and herbarium specimens. Carbon stable isotopes were used as an index of WUE. Genome size was derived from flow-cytometric measurements of leafy shoots.ResultsEvolutionary regressions demonstrated that stomatal size and density covary with genome size, positively and negatively, respectively, with genome size explaining 72-75% of the variation in stomatal size. Larger-genomed species had lower gwmax and C:N ratios, particularly in culms.ConclusionsWe interpret differences in vegetative physiology between the genera as evidence of more-conservative strategies in CFR Schoenus compared to the more-acquisitive Tetraria. Because Schoenus have smaller, reduced leaves, they likely rely more on culm photosynthesis than Tetraria. Across the CFR Schoeneae, ecophysiology correlates with genome size, but confounding sources of trait variation limit inferences about causal relationships between traits.

Návaznosti

GA20-15989S, projekt VaV

Název: Evoluce velikosti genomu - centromerický drajv v nové roli (Akronym: Centrogenomtah)

Investor: Grantová agentura ČR, Evolution of genome size - a new role for the centromere drive

Citovat

VAN MAZIJK, Ruan; Adam G. WEST; G. Anthony VERBOOM; Tammy L ELLIOTT; Petr BUREŠ a A. Muthama MUASYA. Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences. American Journal of Botany. St Louis: Botanical Soc Amer Inc, 2024, roč. 111, č. 8, s. "e16315", 20 s. ISSN 0002-9122. Dostupné z: https://doi.org/10.1002/ajb2.16315.

@article{2431620,
   author = {van Mazijk, Ruan and West, Adam G. and Verboom, G. Anthony and Elliott, Tammy L and Bureš, Petr and Muasya, A. Muthama},
   article_location = {St Louis},
   article_number = {8},
   doi = {https://doi.org/10.1002/ajb2.16315},
   keywords = {Cape Floristic Region; Cyperaceae; functional traits; fynbos; genome size; polyploidy; stomatal size; water-use efficiency},
   language = {eng},
   issn = {0002-9122},
   journal = {American Journal of Botany},
   title = {Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences},
   url = {https://doi.org/10.1002/ajb2.16315},
   volume = {111},
   year = {2024}
}

TY  - JOUR
ID  - 2431620
AU  - van Mazijk, Ruan - West, Adam G. - Verboom, G. Anthony - Elliott, Tammy L - Bureš, Petr - Muasya, A. Muthama
PY  - 2024
TI  - Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences
JF  - American Journal of Botany
VL  - 111
IS  - 8
SP  - "e16315"
EP  - "e16315"
PB  - Botanical Soc Amer Inc
SN  - 00029122
KW  - Cape Floristic Region
KW  - Cyperaceae
KW  - functional traits
KW  - fynbos
KW  - genome size
KW  - polyploidy
KW  - stomatal size
KW  - water-use efficiency
UR  - https://doi.org/10.1002/ajb2.16315
N2  - PremiseIncreases in genome size in plants-often associated with larger, low-density stomata and greater water-use efficiency (WUE)-could affect plant ecophysiological and hydraulic function. Variation in plant genome size is often due to polyploidy, having occurred repeatedly in the austral sedge genus Schoenus in the Cape Floristic Region (CFR), while species in the other major schoenoid genus in the region, Tetraria, have smaller genomes. Comparing these genera is useful as they co-occur at the landscape level, under broadly similar bioclimatic conditions. We hypothesized that CFR Schoenus have greater WUE, with lower maximum stomatal conductance (gwmax) imposed by larger, less-dense stomata.MethodsWe investigated relationships between genome size and stomatal parameters in a phylogenetic context, reconstructing a phylogeny of CFR-occurring Schoeneae (Cyperaceae). Species' stomatal and functional traits were measured from field-collected and herbarium specimens. Carbon stable isotopes were used as an index of WUE. Genome size was derived from flow-cytometric measurements of leafy shoots.ResultsEvolutionary regressions demonstrated that stomatal size and density covary with genome size, positively and negatively, respectively, with genome size explaining 72-75% of the variation in stomatal size. Larger-genomed species had lower gwmax and C:N ratios, particularly in culms.ConclusionsWe interpret differences in vegetative physiology between the genera as evidence of more-conservative strategies in CFR Schoenus compared to the more-acquisitive Tetraria. Because Schoenus have smaller, reduced leaves, they likely rely more on culm photosynthesis than Tetraria. Across the CFR Schoeneae, ecophysiology correlates with genome size, but confounding sources of trait variation limit inferences about causal relationships between traits.
ER  -

VAN MAZIJK, Ruan; Adam G. WEST; G. Anthony VERBOOM; Tammy L ELLIOTT; Petr BUREŠ a A. Muthama MUASYA. Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences. \textit{American Journal of Botany}. St Louis: Botanical Soc Amer Inc, 2024, roč.~111, č.~8, s.~''e16315'', 20 s. ISSN~0002-9122. Dostupné z: https://doi.org/10.1002/ajb2.16315.

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