Diurnal patterns of chlorophyll a fluorescence and stomatal conductance in species of two types of coastal tree vegetation in southeastern Brazil

Mattos, Eduardo Arcoverde de; Grams, Thorsten E. E.; Ball, E. D.; Franco, Augusto C.; Haag-Kerwer, A.; Herzog, Britta; Scarano, Fábio Rúbio; Lüttge, Ulrich

doi:10.1007/pl00009680

Cited by 33 publications

(27 citation statements)

References 27 publications

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“…Non-photochemical processes for energy dispersion in the PSII act as mechanisms to reduce photoinhibition during a period of higher light intensity. The NPQ values recorded in C. semaphora were higher than those found by Franco et al (2007) for some Cerrado plant species, but similar to those reported by Mattos et al (1997) at noon for species in coastal sandy areas (Restinga) and rock outcrops in Brazil. The recovery of Fv/Fm values during the afternoon and the absence of chronic photoinhibition are indicative of the effectiveness of mechanisms that dissipate excess light in plants growing in both sites.…”

supporting

confidence: 84%

Ecophysiological performance of a threatened shrub under restored and natural conditions in a harsh tropical mountaintop environment

et al. 2016

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Ecophysiological responses of plants are useful for monitoring the success of ecological restoration projects that target species conservation. In this study we evaluated the ecophysiological traits of individuals of Chamaecrista semaphora from a natural population and from a site under restoration. Water potential and chlorophyll a fluorescence parameters were measured both in adult and young plants of the two populations. No difference in water potential was found between sites, but individuals in the restored site had higher water potential at predawn. Adults in the natural site presented lower daily values of potential quantum yield, indicating the occurrence of photoinhibition. Individuals in the restored site also presented higher maximum relative electron transport rate (ETR MAX ). No difference was found in leaf carbon isotope discrimination values ( 13 C) between plants growing in restored and natural sites, suggesting similar water use efficiency. These results indicate that C. semaphora individuals in the restored site had similar or better photosynthetic and water economy performances than individuals at the natural site. Methodologies traditionally employed to assess stress response of plants, such as chlorophyll a fluorescence and procedures used to evaluate the efficiency of water use, allowed us to verify the success of restoration procedures using an endangered species.

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confidence: 84%

Ecophysiological performance of a threatened shrub under restored and natural conditions in a harsh tropical mountaintop environment

et al. 2016

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“…As condições ambientais da área de estudo podem ser consideradas similares às comumente encontradas em outras áreas de campos de altitude na Serra da Mantiqueira (Safford 1999). Em afloramentos rochosos há grande insolação e altas taxas de evaporação (Mattos et al 1997) e, por suas características edáficas e de microclima, constituem ilhas xéricas (Porembski et al 1998). Nestas ilhas, a vegetação geralmente se estabelece em uma fina camada de solo, sendo Bromeliaceae, Amaryllidaceae e Orchidaceae importantes componentes da fisionomia (Meirelles et al 1999, Wendt et al 2001.…”

Section: Methodsunclassified

Reprodução sexuada de Dyckia tuberosa (Vell.) Beer (Bromeliaceae, Pitcairnioideae) e interação planta-animal

Vosgueritchian¹,

Buzato²

2006

Rev. bras. Bot.

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-(Sexual reproduction of Dyckia tuberosa (Vell.) Beer (Bromeliaceae, Pitcairnioideae) and plant-animal interaction). Bromeliaceae is an important component in several Biomas due to its remarkable ecological diversity as well as biotic interactions. It presents a combination of two reproductive mechanisms: sexual and clonal propagation. We describe in this study the various attributes related to the sexual reproduction of Dyckia tuberosa as well as plant-animal interactions that take place in its reproductive structures. In the population studied, 55% of individuals blossomed and set fruit over an 11-month period. The flowers developed from the basis to the top and had morphometrical differences with regard to its position in inflorescence that cause also differences in number of seeds set. Sugar concentration in the nectar was 20% and total production of nectar was about 24 µL flower -1 day -1 . Nectar production was bigger in the morning period. Dyckia tuberosa is self-incompatible, an unusual feature for Bromeliaceae, and the index of self-incompatibility (ISI) was 0.08. Only hummingbirds were responsible for the legitimate visits of flowers, contacting anthers and stigma, and 3.9 flowers were visited per hour. Chlorostilbon aureoventris, Colibri serrirostris and Phaethornis eurynome were the hummingbird species registered. Sexual reproduction on D. tuberosa depends on hummingbirds'visitation. Inflorescences of D. tuberosa were also visited by the ant species Camponotus rufipes, Camponotus cf. mus and Cephalotes sp. As sexual reproduction is absent in many individuals and this species is dominant on the granite outcrop of Pedra Grande, we consider clonal propagation an important strategy for the spread of this species in this area. Given the presence of food resources for pollinating and non-pollinating animals on reproductive structures of D. tuberosa, this system seems suitable to assess how variation on resources availablity change the results of these interactions as well as the reproductive output of D. tuberosa.Key words -floral biology, hummingbird pollination, plant-ant interaction, reproductive phenology, self-incompatibility RESUMO -(Reprodução sexuada de Dyckia tuberosa (Vell.) Beer (Bromeliaceae, Pitcairnioideae) e interação planta-animal). Bromeliaceae é um componente importante em vários Biomas, sendo notável a variedade de contextos ecológicos em que pode ser encontrada. Ocorre no grupo a combinação entre dois modos de reprodução: sexuada e propagação clonal. Neste estudo descrevemos vários atributos relacionados à reprodução sexuada de Dyckia tuberosa, bem como interações planta-animal que se estabelecem em suas estruturas reprodutivas. Ao longo de 11 meses, 55 % dos indivíduos na população estudada floresceram e frutificaram. As flores se desenvolvem da base para o ápice e apresentam diferenças morfométricas quanto à posição na inflorescência que acarretam diferenças na produção de sementes. A concentração de açúcares no néctar foi de 20% e a produção total de néctar foi de c. de 24 µ...

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“…A hysteresis in chlorophyll fluorescence parameters between the morning and afternoon has been observed under moderate PPFD in several trees 3,8,12,16,25,43 ; i.e., ∆F/ Fm' and qP (indicators of light use in PSII) were lower in the afternoon than in the morning, and qN and NPQ (indicators of non-photochemical quenching) were higher in the afternoon than in the morning under similar light conditions. In the present study, no hysteresis was found in ∆F/Fm' (= P) for M. gigantea, while such hysteresis was found in ∆F/Fm' for D. cornutus (Table 3).…”

Section: Chlorophyll Fluorescencementioning

confidence: 95%

A Comparison of in situ Leaf Photosynthesis and Chlorophyll Fluorescence at the Top Canopies in Rainforest Mature Trees

Ishida

Toma

Marjenah

2005

JARQ

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The top canopy leaves of mature trees are exposed to high solar radiation, regardless of whether they are climax or pioneer trees. We compared leaf physiology and morphology at the top canopies of a climax Dipterocarpus cornutus tree and a pioneer Macaranga gigantea tree in a rainforest, East Kalimantan. The mass-based maximum net photosynthetic rate (Pn max ) and the nitrogen-based Pn max for M. gigantea were 2.3-fold and 1.6-fold greater than those for D. cornutus, respectively. However, no significant difference in the area-based Pn max between the two species was found, because of its thick lamina of D. cornutus. The dependency of net photosynthetic rate and stomatal conductance on leaf-to-air vapor pressure deficit did not differ between the two trees. Under high irradiance, effective quantum yield (∆F/Fm') of photosystem II (PSII), photochemical quenching (qP), non-photochemical quenchings (qN and NPQ), and electron transport rate in PSII were significantly higher in M. gigantea than in D. cornutus. Under moderate irradiance, a hysteresis in chlorophyll fluorescence parameters between the morning and afternoon was found especially in D. cornutus, i.e., the fraction of qP within the PSII centers decreased and that of excess energy increased in the afternoon. These data indicate low lightuse capacity and high susceptibility for excess light energy of PSII in D. cornutus. The leaf properties were different between the mature climax and pioneer trees, even if their leaves grew under similar light environments at the top canopies.

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Diurnal patterns of chlorophyll a fluorescence and stomatal conductance in species of two types of coastal tree vegetation in southeastern Brazil

Cited by 33 publications

References 27 publications

Ecophysiological performance of a threatened shrub under restored and natural conditions in a harsh tropical mountaintop environment

Ecophysiological performance of a threatened shrub under restored and natural conditions in a harsh tropical mountaintop environment

Reprodução sexuada de Dyckia tuberosa (Vell.) Beer (Bromeliaceae, Pitcairnioideae) e interação planta-animal

A Comparison of in situ Leaf Photosynthesis and Chlorophyll Fluorescence at the Top Canopies in Rainforest Mature Trees

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