Effects of shade treatments on the photosynthetic capacity, chlorophyll fluorescence, and chlorophyll content of Tetrastigma hemsleyanum Diels et Gilg

Dai, Yajuan; Shen, Zonggen; Liu, Ying; Wang, Lanlan; Hannaway, D. B.; Lü, Hongfei

doi:10.1016/j.envexpbot.2008.12.008

Cited by 348 publications

(240 citation statements)

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“…Although the relative water content and leaf area were not analyzed in this study, the data of soil water percentage (Table 1) supported this hypothesis. No significant differences were found in the composition of photosynthetic pigments between plants under sun or shade (Table 2) in contrast with the common notion that higher chlorophyll levels are expressed in shaded conditions (Almeida et al, 2005;Dias et al, 2007;Dai et al, 2009).…”

Section: Discussionmentioning

confidence: 67%

“…Usually in the dry season there is a reduction in photosynthetic assimilation and transpiration as a consequence of reduced stomatal conductance . Many ecophysiological studies involving sun and shade plants have reported comparisons between plants of different successional stages (Souza et al, 2005;Silvestrini et al, 2007;Portes et al, 2008) or of the same species (Nobel, 1976;Dias et al, 2007;Li et al, 2009;Dai et al, 2009). Although studies relating several successional stages are extremely important for understanding the function of the species that integrate an ecosystem, studies involving only one successional group in different environmental conditions, after human impacts, may help to understand the effect of forest fragmentation on the adaptive responses of these plants.…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Silva

Oliveira

Cunha

et al. 2010

Braz. J. Plant Physiol.

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The photosynthetic dynamics of the tropical pioneer species, Byrsonima sericea DC., were studied during the regeneration process of a native forest by evaluating ecophysiological (gas exchange, chlorophyll a fluorescence and photosynthetic pigment contents) and anatomical parameters of plants in sunny and shady environments. Ecophysiological evaluations were carried out monthly for one year, encompassing both a dry and a rainy season. Byrsonima sericea DC. presents anatomical plasticity that enables it to establish in environments with contrasting light regimes. In sunny conditions, it produced a thicker leaf (about 420 mm) and flat adaxial epidermis, whilst in the shade, leaves had a thinner convex adaxial epidermis (about 395 mm). No differences were found in the compositions of the pigments in the different environments, however, during the dry season, the plants presented a significantly higher concentration of photosynthetic pigments. In the sun, plants showed decreases in Fv/F0 ratio (in the rainy season) and NPQ (in the dry season), but no difference was observed between plants that were in the sun or in the shade. A significantly higher net photosynthetic rate was found only in the rainy season in the plants in the sun, compared to shaded plants (9.9±0.8 and 7.4±0.3 μmol m -2 s -1 , respectively). Significant increase in transpiration was observed in plants in the shade during the dry season, but no alterations were observed in the water use efficiency. Ecophysiological data suggest that mainly plants overexposed to the sun underwent water limitations during the dry season and that, in the rainy season, these plants increased their net photosynthetic rate, possibly due to the greater drainage force resulting from increased growth during this period. Data suggest that anatomic alterations, namely the convex adaxial epidermis, could aid in the supply of light to shaded plants during both seasons, precluding changes in the pigments, such as the increase in chlorophyll b usually observed in shaded plants, but not detected in the present study. Another consequence of the greater quantity of light captured by these shade plants is that during the dry season their net photosynthetic rate was not different from that of plants in a sunny environment. However, when water was not a limiting factor, a better photosynthetic performance was observed in this pioneer specie in open spaces.Key words: Atlantic forest species; photosynthetic adaptation; leaf anatomy; sun overexposure; shaded plants. RESUMOA dinâmica fotossintética da espécie pioneira tropical Byrsonima sericea DC. foi estudada durante o processo de regeneração de uma mata nativa por avaliações ecofisiológicas (trocas gasosas, fluorescência da clorofila a e conteúdo de pigmentos fotossintéticos) e parâmetros anatômicos das plantas em ambientes ensolarados e sombreados. As avaliações ecofisiológicas foram feitas mensalmente por um ano e os dados foram agrupados em estação seca e chuvosa. Byrsonima sericea DC. apresentou plasticidade anatômica que a ...

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Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Silva

Oliveira

Cunha

et al. 2010

Braz. J. Plant Physiol.

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“…In this study, the dry weight of the shoots and roots under 0% shade was 24% and 22% lower than that under the 50% shade (Table 1). In Tetrastigma hemsleyanum, the low rate of electron transport through PSII and the high non-photochemical quenching of chlorophyll fluorescence values combined with unhealthy leaf morphology (smaller leaf size and yellow leaf color), as well as the low An of the plants grown under high light intensity suggested that excess light energy damaged the plants (Dai et al, 2009). This is thought to be due to the formation of destructive oxidative molecules, resulting in damage to the photosynthetic apparatus via photoinhibition (Aro et al, 1993;Krause, 1988).…”

Section: Resultsmentioning

confidence: 99%

“…Alternatively, under low irradiance, ATP is too limited to allow for carbon fixation and carbohydrate biosynthesis. This leads to decreased plant growth and development (Dai et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Light Intensity Influences Photosynthesis and Crop Characteristics of Jeffersonia dubia

Rhie¹,

Lee²,

Jung³

et al. 2014

HST

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Jeffersonia dubia is a spring-flowering perennial found in rich forests in Korea and Northern China and has potential as an ornamental or medicinal plant. However, illegal picking and land use change have decreased the number of populations and overall population size of this plant in its natural habitat. Although J. dubia has been reported to be a shade-preferring plant, no study has determined the optimum light intensity for its growth. The objectives of this work were to observe the effects of various shading levels on the physiological responses of J. dubia and to determine the proper shading level for cultivation. Treatments consisted of four shading levels (0%, 50%, 75%, and 95% shade) imposed using black mesh cloth. The number of leaves and dry weight increased with decreased shading. The shoot-to-root ratio increased with increased shading, mainly due to decreased root dry weight under shading. Plants showed low net CO2 assimilation rates and Fv/Fm values combined with low dry matter levels when grown under 0% shade (full sunlight). These results indicate that J. dubia plants experience excessive irradiance without shading, resulting in damage to the photosynthetic apparatus. By contrast, the net photosynthesis rate increased as the shading level increased. Fv/Fm, the potential efficiency of PSII, was 0.8 under 95% shade, indicating that J. dubia is well-adapted under heavy shading. However, the low dry matter of plants in the 95% shade treatment indicated that the low light intensity under 95% shade led to a decline in plant growth. Thus, moderate light (50% shading) is recommended for cultivating J. dubia without physiological defects.

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“…Therefore, under certain environmental conditions, the absorbed light energy can be higher or lower than plant capacity to use it, creating an imbalance caused by photoinhibition or light deficiency. Under these conditions, crop development and yield are severely restricted (Ivanov et al, 2008;Daí et al, 2009;Craven et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Yield and quality of inflorescences of 'Golden Torch' heliconia in different shaded environments

Souza

Beckmann-Cavalcante

Silva

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TLight is one of the factors that most affect crop growth and yield. However, the control of light intensity is difficult, because, under certain environmental conditions, light energy may exceed or limit the capacity of plants to use it. In this sense, the productive behavior of plant species in shaded environments needs to be known. This study aimed to evaluate the effect of different shaded environments with black shade nets [0 (full sun), 35 and 50%, and overlap 35 + 50% shading nets] on flowering, yield and quality of inflorescences of Heliconia psittacorum (cv. 'Golden Torch'). The shaded environments caused a reduction in the number of days for inflorescence emergence and in the cycle of H. psittacorum (cv. 'Golden Torch'). The yield and quality of inflorescences of plants grown under full-sun conditions (0% shading) were impaired. The results indicate that, for a better management of the crop environment, aiming yield and quality of inflorescences of H. psittacorum (cv. 'Golden Torch'), the use of black shade nets with 50% shading is recommended.Produtividade e qualidade de inflorescências de helicônias 'golden torch' em diferentes ambientes de sombreamento R E S U M O A luz é um dos fatores que mais afetam o crescimento e a produtividade das culturas; no entanto, o controle da intensidade luminosa é difícil visto que em determinadas condições ambientais a energia luminosa pode exceder ou limitar a capacidade que a planta tem de utilizá-la; neste sentido, o comportamento produtivo das espécies em ambientes sombreados necessita ser conhecido. Objetivou-se, no presente estudo, avaliar o efeito de diferentes ambientes de sombreamento com telas tipo sombrite de cor preta [0 (pleno sol), 35 e 50% e sobreposição de telas com malhas de 35 + 50%] sobre o florescimento, produtividade e qualidade de inflorescências de Heliconia psittacorum (cv. 'Golden Torch'). Os ambientes de sombreamento promoveram redução no número de dias para emissão da inflorescência e no ciclo das plantas de H. psittacorum (cv. 'Golden Torch'). A produtividade e a qualidade de inflorescências das plantas cultivadas em condições de pleno sol (0% de sombreamento) foram prejudicadas. Os resultados indicam que, para um manejo melhor do ambiente de cultivo visando à produtividade e à qualidade de inflorescências de H. psittacorum (cv. 'Golden Torch') sugere-se a utilização de telas tipo sombrite com malha preta de 50%.

show abstract

Effects of shade treatments on the photosynthetic capacity, chlorophyll fluorescence, and chlorophyll content of Tetrastigma hemsleyanum Diels et Gilg

Cited by 348 publications

References 31 publications

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Light Intensity Influences Photosynthesis and Crop Characteristics of Jeffersonia dubia

Yield and quality of inflorescences of 'Golden Torch' heliconia in different shaded environments

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