Gas exchange and plant growth after defoliation on Leandra lacunosa, a cerrado woody species with continuous leaf production

Damascos, María A.; Ronquim, C. C.; Prado, C. H. B. A.

doi:10.1590/s1516-89132005000800013

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Despite great irradiance variability inside Cerrado physiognomies, there are few data about how leaf position along shoot and shoot inclination affect light incidence in these vegetation. Damascos et al (2005b) investigated the effect of continuous leaf production on P nmax along shoot in a potted evergreen cerrado species with orthotropic shoots (Leandra lacunosa Cogn.). Basal leaves of L. lacunosa showed lower P nmax and leaf mass per area than the middle and apical shoot leaves, which could be a consequence of shading caused by new upper leaves on orthotropic shoots in L. lacunosa.…”

Section: Introductionmentioning

confidence: 99%

“…Shading among leaves on same shoot and shoot inclination would be responsible for similarities or significant morphophysiological differences between basal and distal leaves on shoots in cerrado tree species (Damascos et al, 2005b). Synchronic leaf production in cerrado tree species (Paula, 2002;Damascos et al, 2005a;Damascos, 2008) probably takes place on plagiotropic shoots with leaves exposed to similar irradiance intensity, resulting in equivalent morphophysiological leaf traits in same shoot.…”

Section: Introductionmentioning

confidence: 99%

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Influence of shoot inclination on irradiance and morphophysiological leaf traits along shoots in cerrado trees with distinct leaf deciduousness

Souza

Prado

Damascos

et al. 2009

Braz. J. Plant Physiol.

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This study investigated the relationship among shoot inclination, irradiance and morphophysiological traits of basal (BL) and distal (DL) leaves in six cerrado trees with distinct leaf deciduousness. Deciduous species showed plagiotropic shoots (44º) and larger leaf area than semideciduous and evergreen species, which showed orthotropic shoots (56º and 63º, respectively). Despite larger leaf area, irradiance at shoot base in deciduous was around 85% in relation to full irradiance, while in semideciduous and evergreen only 23% of irradiance reached on BL. Likewise, maximum net photosynthesis (P nmax ) was similar between BL and DL in deciduous. Contrastingly, semideciduous and evergreen showed significant decreasing of P nmax in BL. Plagiotropic shoots of deciduous allow similar irradiance along shoots, resulting in similar P nmax along shoot. On the other hand, orthotropic shoots of semideciduous and evergreen resulted in shading and decreasing of P nmax on BL. However, considering BL and DL together, there was not significant difference of leaf-life-span or P nmax among deciduous, semideciduous and evergreen. Therefore, shoot inclination and shading among leaves on same shoot should be significant influencing leaf morphophysiological traits along shoots in cerrado trees. On the other hand, similar leaf-life-span among phenological groups resulted in absence of P nmax differences when BL and DL were considered together.Key words: Leaf-life-span, maximum net photosynthesis, orthotropic, self-shading, plagiotropic. resumoAs relações entre a inclinação do ramo, irradiância e as características morfofisiológicas de folhas basais (FB) e distais (FD) foram investigadas em seis espécies arbóreas de Cerrado com distintas fenologias foliares. Espécies decíduas apresentaram ramos plagiotrópicos (44º) e maior área foliar do que espécies semidecíduas e sempreverdes com ramos ortotrópicos (56º e 63º, respectivamente). Nas espécies decíduas a irradiância solar foi de 85% na base do ramo, mas nas espécies semidecíduas e sempreverdes menos de 23% da irradiância incidiu nas FB. As decíduas apresentaram fotossíntese líquida máxima (P nmax ) equivalente entre FB e FD, porém, nas semidecíduas e sempreverdes ocorreu uma diminuição significativa de P nmax nas FB. Os ramos plagiotrópicos das decíduas permitiram uma equivalente irradiância solar e similar P nmax ao longo do ramo. De forma contrastante, os ramos ortotrópicos das semidecíduas e sempreverdes resultaram em intenso sombreamento e diminuição de P nmax nas FB. Considerando conjuntamente FB e FD, não houve um gradiente significativo dos valores do tempo de vida da folha (TVF) ou P nmax entre decíduas, semidecíduas e sempreverdes. A inclinação do ramo e o sombreamento correspondente entre as folhas são importantes fatores para a determinação de P nmax ao longo dos ramos nas espécies arbóreas de Cerrado. Por outro lado, quando FB e FD foram consideradas conjuntamente não houve diferença de P nmax entre os grupos fenológicos estudados devido à similaridade do TVF.Palavras...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of shoot inclination on irradiance and morphophysiological leaf traits along shoots in cerrado trees with distinct leaf deciduousness

Souza

Prado

Damascos

et al. 2009

Braz. J. Plant Physiol.

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“…Photosynthesis can be promoted to balance herbivory, because of the ability of plants to compensate for the loss of LA, increasing the photosynthetic activity in the remaining tissue or in the injured tissue (Damascos et al 2005;Zhou et al 2015). A better photochemical performance of PSII was found in H. stigonocarpa plants growing under high [CO 2 ] that had part of their apical leaves removed as a function of ETR and ΦPSII values.…”

Section: Discussionmentioning

confidence: 99%

“…Conversely, herbivory might induce plant growth and physiological adjustment (McNickle & Evans 2018;Zhang et al 2018). Plants can compensate for the loss of tissue in the apical leaves by increasing the net photosynthesis of the remaining leaves or the damaged tissue itself (Retuerto et al 2004;Damascos et al 2005), and minimizing the damage caused by herbivores by investing in growth (Strauss & Agrawal 1999;McNickle & Evans 2018;Zhang et al 2018). As a form of indirect protection, plants are able to attract natural enemies of their herbivores by presenting extrafloral nectaries (EFNs) (Kost & Heil 2005;Röse et al 2006;Schuman & Baldwin 2016;Yamawo & Suzuki 2018).…”

Section: Introductionmentioning

confidence: 99%

Improvement in light utilization and shoot growth in Hymenaea stigonocarpa under high CO 2 concentration attenuates simulated leaf herbivory effects

et al. 2019

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This study evaluated the photochemical responses of photosystem II and growth of Hymenaea stigonocarpa under CO 2-enriched conditions with exposure to simulated herbivory events. After herbivory simulation in two distinct parts of the stem of plants (apex and base), chlorophyll a fluorescence, chlorophyll index, growth, extrafloral nectary density, leaf mineral nutrition, and biomass production were evaluated. Plants of H. stigonocarpa grown under high [CO 2 ] after simulated herbivory in the apical part of the stem had higher electron transport rate, effective quantum yield of photosystem II, and chlorophyll contents. However, simulated herbivory in the basal portion of plants grown under high [CO 2 ] increased plant height, branch and root length, leaf number, leaf area, node number, and leaf expansion rate. In conclusion simulated herbivory at the basal portion and high [CO 2 ] induce positive responses in H. stigonocarpa, leading to the allocation of biomass to vegetative parts related to the capture of resources such as water and light. Apical leaves could compensate for the elimination of part of their leaf blades by increasing their photosynthetic yield. Thus, the increase of [CO 2 ] attenuated the adverse effects of leaf removal on H. stigonocarpa plants by inducing photosynthetic improvement and growth after the loss of leaf tissue.

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“…Such a response has been measured in Tamarix species defoliated by the saltcedar beetle (Diorhabda carinulata), in which episodic partial defoliation resulted in a 16% reduction in mean annual sap flux density (Hultine 2010). However, the relationship between foliar area, leaf gas exchange, and sap flux is complex, as leaf-level compensatory responses have shown to increase stomatal conductance and transpiration in some cases (Damascos et al 2005;Meinzer and Grantz 1991;Pataki et al 1998;Reich et al 1993;Williams et al 2016). This upregulation of gas exchange and transpiration is not consistent across tree species or among different classes of defoliator (e.g.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Pathogen-induced defoliation impacts on transpiration, leaf gas exchange, and non-structural carbohydrate allocation in eastern white pine (Pinus strobus)

McIntire

Huggett

Dunn

et al. 2020

Trees

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Key message Pathogen-induced defoliation resulted in a reduction in transpiration, an upregulation of photosynthesis in the early growing season, and no change in NSC reserves across stem, root, and foliar tissues. Abstract The defoliation of eastern white pine (Pinus strobus L.) by native fungi associated with white pine needle damage (WPND) can substantially reduce foliar area for much of the growing season in the northeastern United States. Chronic defoliations in the region are known to have slowed growth rates in symptomatic stands, but the physiological impacts of WPND as it relates to tree water use and carbon assimilation are largely unresolved. We investigated how the severity of WPND defoliation influences transpiration throughout the course of a growing season. We also assessed leaf-level gas exchange between defoliation severity classes and needle age over time. Finally, we compared concentrations of non-structural carbohydrates (NSC) between defoliation severity classes in five different tissue types over time. We found that trees experiencing a high-severity defoliation had 20% lower sap flux density compared to low-severity individuals. We found that rates of photosynthesis were significantly influenced by the needle age class and time of year, while instantaneous water use efficiency was higher across all needle age classes late in the growing season. Our findings suggest that the residual current-year foliage of high-severity defoliated trees compensated for the loss of mature second-and third-year foliage in the early portion of the growing season. This study found that soluble sugars and starch varied significantly over time and by tissue type, but defoliation severity had little effect on NSC concentrations. Together with reduced basal area increment in high-severity trees relative to low-severity trees, this indicates that WPND-affected trees are prioritizing NSC storage over secondary growth.

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Gas exchange and plant growth after defoliation on Leandra lacunosa, a cerrado woody species with continuous leaf production

Abstract: Morphological and physiological leaf traits were studied on control and defoliated potted

Cited by 6 publications

References 17 publications

Influence of shoot inclination on irradiance and morphophysiological leaf traits along shoots in cerrado trees with distinct leaf deciduousness

Influence of shoot inclination on irradiance and morphophysiological leaf traits along shoots in cerrado trees with distinct leaf deciduousness

Improvement in light utilization and shoot growth in Hymenaea stigonocarpa under high CO 2 concentration attenuates simulated leaf herbivory effects

Pathogen-induced defoliation impacts on transpiration, leaf gas exchange, and non-structural carbohydrate allocation in eastern white pine (Pinus strobus)

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