Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae

Lusk, Christopher H.; Corcuera, Luís J.

doi:10.4067/s0716-078x2011000200011

Cited by 20 publications

(11 citation statements)

References 28 publications

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“…Burret, Amomyrtus luma (Molina) Legr. et Kaus, Aextoxicum punctatum R. et P., Eucryphia cordifolia Cav., and Drimys wintery J.R. et G. Forster (Saldaña and Lusk 2003;Lusk and Corcuera 2011). The climate is humid temperate with an oceanic influence (Di Castri and Hajek 1976), although frost events do usually occur from early fall to spring (Reyes-Díaz et al 2005).…”

Section: Study Area and Speciesmentioning

confidence: 98%

“…Specifically, we considered low-light plants as those growing at %CO less than 10 and high-light plants as those growing at %CO greater than 10. Previous studies have indicated that leaf traits such as longevity and gas exchange parameters in G. avellana differ between this %CO threshold (Lusk 2002;Lusk and Corcuera 2011). We used Pearson's correlations to evaluate the relationship between leaf traits and plant height within these two %CO classes.…”

Section: Statistical Analysesmentioning

confidence: 99%

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Light Environment Has Little Effect on Heteroblastic Development of the Temperate Rain Forest Tree Gevuina avellana Mol. (Proteaceae)

Ostria-Gallardo

Paula

Corcuera

et al. 2015

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences. Editor: Adrienne NicotraPremise of research. Heteroblastic species are those that show an abrupt change in shape and/or size among individual metamers during ontogeny. Gevuina avellana Mol. (Proteaceae) is a typical tree species in the temperate rain forests of Chile and Argentina. This tree shows drastic heteroblasty, changing from simple leaves at the seedling stage to pinnate leaves during development. It regenerates mostly in shady understories, but juveniles can be found growing under a wide range of light conditions (5%-50% canopy openness). Thus, considering that light has been proposed as a driver of the heteroblastic strategy, G. avellana is an interesting model to study the potential environmental modulation of its ontogenetically programmed heteroblasty. Therefore, the aim of this study was to determine the effect of light availability on G. avellana's heteroblastic trajectory. We postulated that G. avellana's ontogenetic changes in leaf complexity (i.e., heteroblasty) increase under high light availability.Methodology. Saplings along most of the light availability gradient were sampled. Plant height was used as a proxy for ontogeny. We measured several leaf traits (leaf area), shape (aspect ratio), pinnation (leaf dissection index), and complexity (fractal dimension index). First, we evaluated the change in each leaf trait with height by means of Pearson's correlation. Then we tested for differences in leaf traits along the ontogeny between two light environments (higher and lower than 10% canopy openness) by the line-fitting standardized major axis method.Pivotal results. We found positive correlations between each leaf trait and plant height (P ! 0.001), while only leaf size and complexity showed higher ontogenetic increases under high light.Conclusions. Light environment has a small but significant effect on the heteroblastic trajectory of G. avellana. In particular, saplings inhabiting microsites with high light availability have larger and more complex leaves. While allometry would explain the ontogenetic trajectory of leaf size, the increased complexity could reflect functional advantages for large leaves in tall plants, especially under high light conditions.

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Section: Study Area and Speciesmentioning

confidence: 98%

Section: Statistical Analysesmentioning

confidence: 99%

Light Environment Has Little Effect on Heteroblastic Development of the Temperate Rain Forest Tree Gevuina avellana Mol. (Proteaceae)

Ostria-Gallardo

Paula

Corcuera

et al. 2015

International Journal of Plant Sciences

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“…This involves the coordination of light-mediated signals, hormone synthesis and signaling, and the heterochrony of the ontogenetic program. The responses of functional traits, such as leaf longevity and leaf mass per area, to light availability and the ontogenetic variation in light requirements have been reported for this species (Lusk et al, 2008;Lusk & Corcuera, 2011). However, the genetic basis that regulates the physiological acclimation allowing G. avellana to grow in a wide variety of light environments remains unknown.…”

Section: Introductionmentioning

confidence: 99%

Decoding the gene coexpression network underlying the ability of Gevuina avellana to live in diverse light conditions

et al. 2018

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Gevuina avellana (Proteaceae) is a typical tree from the South American temperate rainforest. Although this species mostly regenerates in shaded understories, it exhibits an exceptional ecological breadth, being able to live under a wide range of light conditions. Here we studied the genetic basis that underlies physiological acclimation of the photosynthetic responses of G. avellana under contrasting light conditions. We analyzed carbon assimilation and light energy used for photochemical processes in plants acclimated to contrasting light conditions. Also, we used a transcriptional profile of leaf primordia from G. avellana saplings growing under different light environments in their natural habitat, to identify the gene coexpression network underpinning photosynthetic performance and light-related processes. The photosynthetic parameters revealed optimal performance regardless of light conditions. Strikingly, the mechanism involved in dissipation of excess light energy showed no significant differences between high- and low-light-acclimated plants. The gene coexpression network defined a community structure consistent with the photochemical responses, including genes involved mainly in assembly and functioning of photosystems, photoprotection, and retrograde signaling. This ecophysiological genomics approach improves our understanding of the intraspecific variability that allows G. avellana to have optimal photochemical and photoprotective mechanisms in the diverse light habitats it encounters in nature.

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“…This involves the coordination of light-mediated signals, hormone synthesis and signaling, and the heterochrony of the ontogenetic program. The responses of functional traits, such as leaf longevity and leaf mass per area, to light availability and the ontogenetic variation in light requirements have been reported for this species (Lusk et al, 2008; 2011). However, the genetic basis that regulates the physiological acclimation allowing G. avellana to grow in a wide variety of light environments remains unknown.…”

Section: Introductionmentioning

confidence: 87%

Decoding the gene co-expression network underlying the ability of Gevuina avellana Mol. to live in diverse light conditions

Ostria-Gallardo

Ranjan

Ichihashi

et al. 2017

Preprint

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28 • Gevuina avellana Mol. (Proteaceae) is a typical tree from the South American 29 temperate rainforest. Although this species mostly regenerates in shaded understories, it 30 exhibits an exceptional ecological breadth, being able to live under a wide range of light 31 conditions. Here we studied the genetic basis regulating physiological acclimation of the 32 photosynthetic responses of G. avellana under contrasting light conditions. 33 • We analyzed carbon assimilation and light energy used for photochemical process 34 in plants acclimated to contrasting light conditions. Also, we used a transcriptional profile 35 of leaf primordia from G. avellana saplings growing under different light environments 36 to identify the gene co-expression network underpinning photosynthetic performance and 37 light-related processes. 38 • The photosynthetic parameters revealed optimal performance regardless of light 39 conditions. Strikingly, the mechanism involved in dissipation of excess light energy 40 showed no significant differences between high and low-light acclimated plants. The gene 41 co-expression network defined a community structure consistent with the photochemical 42 responses, including genes involved mainly in assembly and functioning of photosystems, 43 photoprotection, and retrograde signaling. 44 • Our ecophysiological genomics approach provides an understanding of the 45 molecular regulatory mechanisms that allows this tree to have an optimal balance between 46 photochemical, photoprotective and antioxidant performance in the diverse light habitats 47 it encounters in nature.48

show abstract

Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae

Cited by 20 publications

References 28 publications

Light Environment Has Little Effect on Heteroblastic Development of the Temperate Rain Forest Tree Gevuina avellana Mol. (Proteaceae)

Light Environment Has Little Effect on Heteroblastic Development of the Temperate Rain Forest Tree Gevuina avellana Mol. (Proteaceae)

Decoding the gene coexpression network underlying the ability of Gevuina avellana to live in diverse light conditions

Decoding the gene co-expression network underlying the ability of Gevuina avellana Mol. to live in diverse light conditions

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