Photosynthetic Performance of Ginkgo biloba L. Grown Under High and Low Irradiance

Pandey, Sarvesh Kumar; Kumar, Sanjay; Nagar, P. K.

doi:10.1023/b:phot.0000027514.56808.35

Cited by 38 publications

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References 34 publications

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“…This could be the reason that these plants are adapted to altitude ranging between 400-4 000 m where they can sustain strong fluctuations in irradiance (Ansari et al 1999, Singh 2000, Bahar 2002). The increase in C i with increasing irradiance suggested an increase in photorespiration rate at HA (Pandey et al 2003). HA plants have higher photorespiration rates, which is beneficial for plants to protect PS2 from high energy solar radiation (Streb et al 1998, Taub et al 2000.…”

Section: Discussionmentioning

confidence: 96%

Photosynthetic characteristics of Hordeum, Triticum, Rumex, and Trifolium species at contrasting altitudes

Kumar¹,

Kumar²,

Ahuja³

2005

Photosynt.

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Photosynthetic characteristics were compared between plants of low altitude (LA) grown at LA (Palampur; 1 300 m) and at high altitude, HA (Kibber; 4 200 m), and plants naturally occurring at different altitudes (Palampur, 1 300 m; Palchan, 2 250 m; and Marhi, 3 250 m). Net photosynthetic rate (P N ) was not significantly different between altitudes. However, the slopes of the curve relating P N to intercellular CO 2 concentration (C i ) were higher in plants at Palchan, Marhi, and Kibber compared to those at Palampur, indicating that plants had higher efficiency of carbon uptake (the initial slope of P N /C i curve is an indication) at HA. They had also higher stomatal conductance (g s ), transpiration rate, and lower water use efficiency at HA. g s was insensitive to photosynthetic photon flux density (PPFD) for plants naturally occurring at Palampur, Palchan, and Marhi, whereas plants from LA grown at Palampur and Kibber responded linearly to increasing PPFD. Insensitivity of g s to PPFD could be one of the adaptive features allowing wider altitudinal distribution of the plants.Additional key words: intercellular CO 2 concentration; net photosynthetic rate; photosynthetic photon flux density; stomatal conductance.

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Section: Discussionmentioning

confidence: 96%

Photosynthetic characteristics of Hordeum, Triticum, Rumex, and Trifolium species at contrasting altitudes

Kumar¹,

Kumar²,

Ahuja³

2005

Photosynt.

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“…The decrease of mesophyll thickness in R. emodi under low irradiance in respect to high irradiance is mainly due to the palisade parenchyma thickness decrease (Hanba et al 2002, Pandey and Nagar 2002, Pandey et al 2003. The increase in mesophyll, leaf, and epidermis thicknesses may explain the higher LMA in R. emodi in the field than in the greenhouse (cf.…”

Section: Discussionmentioning

confidence: 97%

Morpho-anatomical and physiological leaf traits of two alpine herbs, Podophyllum hexandrum and Rheum emodi in the Western Himalaya under different irradiances

Pandey¹,

Kumar²,

Kushwaha³

2006

Photosynt.

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Morpho-anatomical leaf traits and photosynthetic activity of two alpine herbs, Podophyllum hexandrum (shade-tolerant) and Rheum emodi (light-requiring), were studied under field (PAR>2 000 mol m -2 s -1 ) and greenhouse (PAR 500 mol m -2 s -1 ) conditions. Mesophyll thickness, surface area of mesophyll cells facing intercellular spaces (S mes ), surface area of chloroplasts facing intercellular spaces (S c ), intercellular spaces of mesophyll cells (porosity), photon-saturated rate of photosynthesis per unit leaf area (P Nmax ), and ribulose-1,5-bisphosphate carboxylase/oxygenase activity decreased in the greenhouse with respect to the field and the decreases were significantly higher in R. emodi than in P. hexandrum. P. hexandrum had lower intercellular CO 2 concentration than R. emodi under both irradiances. The differences in acclimation of the two alpine herbs to low irradiance were due to their highly unlikely changes in leaf morphology, anatomy, and P Nmax which indicated that the difference in radiant energy requirement related to leaf acclimation had greater impact under low than high irradiance.Additional key words: alpine plants; leaf anatomy; leaf mass per unit leaf area; leaf physiology; mesophyll; net photosynthetic rate; ribulose-1,5-bisphosphate carboxylase/oxygenase.

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“…It is believed that the stomatal index (SI) does not vary so much as SD, the first being so intrinsic to the species (Salisbury, 1927). However, we question the invariability of SI, since certain studies have shown the opposite (Lake et al, 2001;Liao et al, 2005;Miyazawa et al, 2006;Pandey et al, 2003;Zhao et al, 2006). In this study, we assessed the effect of environmental light on the leaf anatomy and plasticity of coffee plants, and enumerated the interference factors in leaf acclimation, specifically on stomata and epidermal structures.…”

Section: Introductionmentioning

confidence: 97%

What is the influence of ordinary epidermal cells and stomata on the leaf plasticity of coffee plants grown under full-sun and shady conditions?

et al. 2010

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Stomata are crucial in land plant productivity and survival. In general, with lower irradiance, stomatal and epidermal cell frequency per unit leaf area decreases, whereas guard-cell length or width increases. Nevertheless, the stomatal index is accepted as remaining constant. The aim of this paper to study the influence of ordinary epidermal cells and stomata on leaf plasticity and the influence of these characteristics on stomata density, index, and sizes, in the total number of stomata, as well as the detailed distribution of stomata on a leaf blade. As a result, a highly significant positive correlation (R 2 a = 0.767 p ≤ 0.001) between stomatal index and stomatal density, and with ordinary epidermal cell density (R 2 a = 0.500 p ≤ 0.05), and a highly negative correlation between stomatal index and ordinary epidermal cell area (R 2 a = -0.571 p ≤ 0.001), were obtained. However in no instance was the correlation between stomatal index or stomatal density and stomatal dimensions taken into consideration. The study also indicated that in coffee, the stomatal index was 19.09% in shaded leaves and 20.08% in full-sun leaves. In this sense, variations in the stomatal index by irradiance, its causes and the consequences on plant physiology were discussed. Keywords: stomatal index, stomatal density, sun and shade plants, Coffea arabica L.Qual a influência das células epidérmicas ordinárias e dos estômatos na plasticidade foliar de cafeeiros desenvolvidos a pleno sol e sob condições de sombra? ResumoOs estômatos são fundamentais na fisiologia vegetal e na sobrevivência das plantas. Em geral, com a diminuição da irradiância, a frequência estomática, ou mesmo epidérmica, por unidade de área foliar diminui, enquanto as dimensões dos estômatos aumentam. Por outro lado, acredita-se que o índice estomático, sendo uma característica intrínseca da planta, permanece constante. O objetivo deste trabalho foi estudar a influência das células epidérmicas ordinárias e das células estomáticas na plasticidade da folha e as influências destas características sobre a densidade e no índice estomático, bem como nas dimensões e no número de estômatos e descrever, em detalhes, os principais fatores que os alteram. Verificou-se, neste trabalho, uma correlação fortemente significativa (R 2 a = 0,767 p ≤ 0,001) entre o índice estomático e a densidade estomática, ou mesmo, entre este e a densidade de células epidérmicas (R 2 a = 0,500 p ≤ 0,05). Uma forte correlação negativa entre o índice estomático e a área das células epidérmicas (R 2 a = -0,571 p ≤ 0,001) também foi verificada, entretanto, nenhuma correlação foi verificada entre o índice estomático e as dimensões dos estômatos, assim como sugere a literatura. De qualquer modo, este estudo demonstrou que o índice estomático do cafeeiro é de 19,09% nas folhas sombreadas e de 20,08% nas folhas a pleno sol. Neste sentido, as variações no índice estomático causadas pela irradiância, suas causas e consequências para a fisiologia vegetal são discutidas em detalhes.Palavras-chave: índice e...

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Photosynthetic Performance of Ginkgo biloba L. Grown Under High and Low Irradiance

Cited by 38 publications

References 34 publications

Photosynthetic characteristics of Hordeum, Triticum, Rumex, and Trifolium species at contrasting altitudes

Photosynthetic characteristics of Hordeum, Triticum, Rumex, and Trifolium species at contrasting altitudes

Morpho-anatomical and physiological leaf traits of two alpine herbs, Podophyllum hexandrum and Rheum emodi in the Western Himalaya under different irradiances

What is the influence of ordinary epidermal cells and stomata on the leaf plasticity of coffee plants grown under full-sun and shady conditions?

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