Morphological and physiological plasticity in seedlings of Araucaria angustifolia and Cabralea canjerana is related to plant establishment performance in the rainforest

Olguín, Flavia Yesica; Moretti, Ana Paula; Pinazo, Martín Alcides; Gortari, Fermín; Bahima, José Vera; Graciano, Corina

doi:10.1016/j.foreco.2020.117867

Cited by 18 publications

(17 citation statements)

References 29 publications

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“…We observed that the jaboticaba tree saplings could acclimate to different light levels, evidencing the species' plasticity. Although our experiment was conducted in pots and artificial shade, they could be considered a good indicator for verifying species' plasticity, consistent with results founded under forest gaps (Olguin et al, 2020). This phenotypic plasticity gives the possibility to realize new planting even under full sun and inside a highly shaded forest.…”

Section: Discussionsupporting

confidence: 83%

“…On the other hand, under low light intensity, plant growth reduction may occur unless they develop mechanisms to maximize light uptake, such as increasing the leaf area, the chlorophyll content, and the efficiency light use in the photosystem II reaction center (Santos et al, 2015;Mathur et al, 2018). These plants mechanisms can be better understood submitting the saplings to artificial shade, because its behavior is related to natural conditions (Olguin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Morphophysiological adjustments to shade of jaboticaba tree saplings

et al. 2022

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We aimed to verify the morphophysiological changes in jaboticaba tree (Plinia peruviana (Poir.) Govaerts) saplings under shade gradient to improve knowledge on the appropriate light environmental conditions for the saplings production and field homogeneous or intercropping cultivation of this species. The saplings were grown under full sun and artificial shade levels (30%, 50%, and 80%). Growth, photosynthetic pigments, gas exchanges, chlorophyll fluorescence, and leaf anatomy characters were evaluated. Our results showed that jaboticaba tree saplings growth was improved under full sun and 30% of shade. Under 50% and 80% shade the saplings demonstrate phenotypic plasticity, such as larger and thinner leaves. Chlorophyll fluorescence, chlorophyll content, and quantum yield of photosystem II were higher under higher shade level, but the CO 2 assimilation rate was not different between light conditions. These changes are typically found in shade-tolerant plants and is related to perform photosynthesis more efficiently in highly variable light conditions. Despite that, we recommend that cultivation be carried out under full sun or up to 30% shade to maximize jaboticaba tree saplings growth in nurseries and orchards.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Morphophysiological adjustments to shade of jaboticaba tree saplings

et al. 2022

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“…Mart. plants have an aboveground/belowground biomass ratio close to 2 when the water conditions are favorable, while that ratio is less than 0.5 when the plants experience high evapotranspiration demands (Olguin et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Growth and Physiological Responses of Yerba Mate Seedlings and Mini-Cuttings Under Drought Stress

Gortari

Londero

Rocha

et al. 2020

CERNE

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“…C. canjerana seedlings were successfully established under the canopy of a 14-year-old A. angustifolia plantation, with an incident PFDD ranging from 4 to 58% with respect to that of open areas. Our early studies indicated that C. canjerana seedlings have high phenotypic plasticity, which gives them the ability to acclimate to different coverage conditions, even at more extreme low light intensities (below 10 µmol photons m 2 s -1 ) registered in the native forest (Moretti et al 2019b;Olguin et al 2020). The monolayer at umbrella-shaped crown of A. angustifolia produced a sparse canopy cover and high light intensity; sun ecks reached the understory and allowed high growth rates of C. canjerana seedlings.…”

Section: Growth and Acclimation Of C Canjerana Seedlings Under A Angu...mentioning

confidence: 90%

“…On the other hand, Cabralea canjerana (Vell.) Mart is a mid-succession timber broadleaved species, native from the same eco-region with a wide distribution in Central and South America (from 10°N to 35.5°S), that acclimates to different microenvironments within the rainforest (Moretti et al 2019b;Olguin et al 2020). C. canjerana trees are extracted for sawing from the native rainforest, so there are no plantations with this high economic value species.…”

Section: Introductionmentioning

confidence: 99%

Combining the light-demanding Araucaria angustifolia with the shade-tolerant Cabralea canjerana: mixed plantations to produce tropical timber trees outside the rainforest

Olguín

Moretti

Pinazo

et al. 2022

Preprint

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Atlantic Forest broad-leaved trees of high timber value require canopy cover to become established. Therefore, at present, they are only harvested from native rainforests. Araucaria angustifolia (Bertol.) Kuntze is the only Atlantic Forest Gymnosperm; it requires high radiation to establish and is planted in monospecific stands. The main question was if the umbrella-shaped open canopy generated by A. angustifolia stands was enough to protect mid-successional timber species. We evaluated the establishment of Cabralea canjerana (Vell.) Mart under the canopy of A. angustifoliastands and we related growth with initial competition. In one stand, we measured environmental and physiological traits to evaluate seedling acclimation. C. canjerana establishment was successful in stands of different basal areas. Seven years after planting, C. canjerana plants reached a 12-meter height and 75% survived; the highest growth was observed with up to two A. angustifolia neighbors within a 5m radius. According to this evidence, it is possible to convert A. angustifolia even-aged stands to uneven-aged mixed stands. In this way, a valuable native timber species that requires canopy protection during the first years can be planted outside the rainforest. This is the first report of an uneven-aged mixed plantation of two Atlantic Forest timber species.

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Morphological and physiological plasticity in seedlings of Araucaria angustifolia and Cabralea canjerana is related to plant establishment performance in the rainforest

Cited by 18 publications

References 29 publications

Morphophysiological adjustments to shade of jaboticaba tree saplings

Morphophysiological adjustments to shade of jaboticaba tree saplings

Growth and Physiological Responses of Yerba Mate Seedlings and Mini-Cuttings Under Drought Stress

Combining the light-demanding Araucaria angustifolia with the shade-tolerant Cabralea canjerana: mixed plantations to produce tropical timber trees outside the rainforest

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