Trait coordination, mechanical behaviour and growth form plasticity of <i>Amborella trichopoda</i> under variation in canopy openness

Trueba, Santiago; Isnard, Sandrine; Barthélémy, Daniel; Olson, Mark E.

doi:10.1093/aobpla/plw068

Cited by 17 publications

(12 citation statements)

References 110 publications

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“…Previous investigations have found that plants with thicker stems and larger leaves are frequently accompanied by less frequent branching with wider branching angles (Cornelissen, 1999;Corner, 1949;Trueba et al, 2016;Wright & Westoby, 2002. Accordingly, we found larger leaves and canopies areas to be characteristic traits of the MR ecotype ( Table 3).…”

Section: Adaptive Syndrome Trait Correlations Within the Mr Ecotypesupporting

confidence: 71%

Adaptive trait syndromes along multiple economic spectra define cold and warm adapted ecotypes in a widely distributed foundation tree species

et al. 2020

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1. The coordination of traits from individual organs to whole plants is under strong selection because of environmental constraints on resource acquisition and use. However, the tight coordination of traits may provide underlying mechanisms of how locally adapted plant populations can become maladapted because of climate change. 2. To better understand local adaptation in intraspecific trait coordination, we studied trait variability in the widely distributed foundation tree species, Populus fremontii using a common garden near the mid-elevational point of this species distribution. We examined 28 traits encompassing four spectra: phenology, leaf economic spectrum (LES), whole-tree architecture (Corner's Rule) and wood economic spectrum (WES). 3. Based on adaptive syndrome theory, we hypothesized that trait expression would be coordinated among and within trait spectra, reflecting local adaptation to either exposure to freeze-thaw conditions in genotypes sourced from highelevation populations or exposure to extreme thermal stress in genotypes sourced from low-elevation populations. 4. High-elevation genotypes expressed traits within the phenology and WES that limit frost exposure and tissue damage. Specifically, genotypes sourced from high elevations had later mean budburst, earlier mean budset, higher wood densities, higher bark fractions and smaller xylem vessels than their low-elevation counterparts. Conversely, genotypes sourced from low elevations expressed traits within the LES that prioritized hydraulic efficiency and canopy thermal regulation to cope with extreme heat exposure, including 40% smaller leaf areas, 67% higher stomatal densities and 34% higher mean theoretical maximum stomatal conductance. Lowelevation genotypes also expressed a lower stomatal control over leaf water potentials that subsequently dropped to pressures that could induce hydraulic failure.

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Section: Adaptive Syndrome Trait Correlations Within the Mr Ecotypesupporting

confidence: 71%

Adaptive trait syndromes along multiple economic spectra define cold and warm adapted ecotypes in a widely distributed foundation tree species

et al. 2020

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“…In the same line of thought, (Olson et al 2009) claimed that the negative trade-off between the volume of an axis and its density is a corollary to Corner’s rules and the LSR. This is in agreement with the recent work of (Trueba et al 2016) at an intraspecific level, since leaf area was shown to be a negative trade-off with both leafing intensity and stem density according to canopy openness in a New-Caledonian woody shrub species. We are first the show that this aspect of Corner’s rules applies to the leaf scale, considering lobes as counterparts of the branching process.…”

Section: Discussionsupporting

confidence: 93%

“…Interestingly, this aspect of Corner’s rules applies to the leaf scale, considering lobes as counterparts of the branching process. Above all, this functional dimension (branching and leafing intensities) has rarely been studied (White, 1983a; Ackerly & Donoghue, 1998; Kleiman & Aarssen, 2007; Olson et al, 2009; Osada et al, 2015; Trueba et al, 2016) and is far from being integrated in the leaf or global spectra of economy (Westoby et al, 2002; Westoby and Wright, 2003; Wright et al, 2004; Díaz et al, 2016), whereas it is directly linked to the optimization strategy of leaf area partitioning (Smith et al, 2017) and hence light-interception performance (Duursma et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Sent to the Corner: xylem vessel anatomy not surface area determines megaphyll hydraulics inCecropia obtusaTrécul (Urticaceae)

Levionnois

Coste

Nicolini

et al. 2018

Preprint

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Corners rule predicts a positive correlation between leaf dimensions and the cross-sectional area of the primary stem. Although this relationship is usually explained by hydraulic and mechanical requirements, these hypotheses have never been tested empirically. However, Corner’s rule is tricky to investigate since rapid secondary growth of the stem prevents a rigorous link being established between a given leaf and the supporting stem. We chose a twig-like leaf model since petiole anatomy is only linked to the attached lamina. We tested the hypothesis that anatomical adjustments to hydraulic requirements related to vessel size enable reduced investment in tissue in the framework of Corner’s rule. We conducted a functional, mechanistic and intraspecific investigation of Cecropia obtusa Trécul, a Neotropical pioneer tree, by integrating morphological, anatomical and theoretical hydraulic traits around the lamina-petiole size relationship. The twig-like structure of the leaf and the strong lamina-petiole correlation of this model tree species made it possible to use the leaf-level model for a rigorous investigation of the functional implications of Corner’s rule. We found a positive correlation between petiole size, lamina size, the ratio of mean vessel area to vessel frequency in the petiole xylem and theoretical specific conductivity in the petiole xylem. Hydraulic function supports Corner’s rule to a lesser extent than previously thought. Variations in vessel dimensions mainly drive xylem hydraulic performances and avoid disproportionate petiole cross-sections to answer to hydraulic requirements associated with lamina size.

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“…Drought tolerance was also found to be higher for C. canephora genotypes displaying smaller leaves [42]. In fact, it is known in other plants that smaller leaves allow for more rapid convective heat loss, resulting in lower transpiration and water loss likely due to smaller boundary layer [94]. Furthermore, a more compact crown structure may result in reduced VPD air within the coffee canopy, decreasing the transpiration demand [14], besides allowing to increase plant density coupled with improved soil covering and reducing the negative impacts of elevated temperatures, and high wind speed on coffee trees.…”

Section: The Impact Of Climate Changes On Coffee Crop: Warming and Wamentioning

confidence: 88%

Mitigation of the Negative Impact of Warming on the Coffee Crop: The Role of Increased Air [CO2] and Management Strategies

Dubberstein¹,

Rodrigues²,

Semedo³

et al. 2018

Climate Resilient Agriculture - Strategies and Perspectives

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Crop sustainability can be threatened by new environmental challenges regarding predicted climate changes and global warming. Therefore, the study of real biological impacts of future environmental conditions (e.g., increased air [CO 2 ], supra-optimal temperature and water scarcity) on crop plants, as well as the re-evaluation of management procedures and strategies, must be undertaken in order to improve crop adaptation and promote mitigation of negative environmental impacts, thus affording crop resilience. Coffee is a tropical crop that is grown in more than 80 countries, making it one of the world's most traded agricultural products, while involving millions of people worldwide in the whole chain of value. It has been argued that this crop will be highly affected by climate changes, resulting in decreases in both suitable areas for cultivation and productivity, as well as impaired beverage quality in the near future. Here, we report recent findings regarding coffee species exposure to combined supra-optimal air temperatures and enhanced air [CO 2 ], and impacts of drought stress on the crop. Ultimately, we discuss key strategies to improve coffee performance in the context of new environmental scenarios. The recent findings clearly show that high [CO 2 ] has a positive impact on coffee plants, increasing their tolerance to high temperatures. This has been related to a better

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Trait coordination, mechanical behaviour and growth form plasticity of Amborella trichopoda under variation in canopy openness

Cited by 17 publications

References 110 publications

Adaptive trait syndromes along multiple economic spectra define cold and warm adapted ecotypes in a widely distributed foundation tree species

Adaptive trait syndromes along multiple economic spectra define cold and warm adapted ecotypes in a widely distributed foundation tree species

Sent to the Corner: xylem vessel anatomy not surface area determines megaphyll hydraulics inCecropia obtusaTrécul (Urticaceae)

Mitigation of the Negative Impact of Warming on the Coffee Crop: The Role of Increased Air [CO2] and Management Strategies

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