Photosynthetic light response curves determined with the leaf oxygen electrode: minimisation of errors and significance of the convexity term

Akhkha, Abdellah; Reid, I. Neill; Clarke, Don D.; Dominy, Peter

doi:10.1007/s004250100599

Cited by 18 publications

(15 citation statements)

References 9 publications

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“…For alpine plants, the optimum temperature for photosynthesis decreased with increasing altitudes (Dillaway 2009, Fryer and Ledig 1972, Berry and Bjorkman 1980, Rada et al 2010. In our study, the optimum photosynthetic temperature was about 20°C, lower than the 25°C optimum that has been measured for lowland plants (Akhkha et al 2001). The photosynthetic capacity decreased as the temperature increased to a level above the optimal value (Lindroth et al 1998).…”

Section: Discussioncontrasting

confidence: 77%

A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau

2011

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To determine the photosynthetic characteristics of C 3 plants and their sensitivity to CO 2 at different altitudes on the Tibetan Plateau, hulless barley (Hordeum vulgare L. ssp. vulgare) was grown at altitudes of 4,333 m and 3,688 m. Using gas-exchange measurements, photosynthetic parameters were simulated, including the maximum net photosynthesis (P max ) and the apparent quantum efficiency (α). Plants growing at higher altitude had higher net photosynthetic rates (P N ), photosynthesis parameters (P max and α) and sensitivities to CO 2 enhancement than plants growing at lower altitude on the Tibetan Plateau. The enhancements of P N , P max , and α for plants growing at higher altitude, corresponding with 10 μmol(CO 2 ) mol -1 increments, were approximately 0.20~0.45%, 0.05~0.20% and 0.12~0.36% greater, respectively, than for plants growing at lower altitude, respectively, where CO 2 levels rose from 10 to 170 μmol(CO 2 ) mol -1 . Therefore, on the Tibetan Plateau, the changes in the photosynthetic capacities and the photosynthetic sensitivities to CO 2 observed in the C 3 plants grown above 3,688 m are likely to increase with altitude despite the decreasing CO 2 partial pressure.Additional key words: altitude; apparent quantum efficiency; maximum net photosynthesis; Tibetan Plateau.

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Section: Discussioncontrasting

confidence: 77%

A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau

2011

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“…At high PPFD, plantlets grown without sucrose showed the best efficiency of PPFD but it was reduced in plantlets with high exogenous sucrose. The k factor at high PPFD, indicated some limitation to the efficiency of the carboxylation probably on CO 2 supply to chloroplast stroma (Akhkha et al 2001, Sawada et al 2001. At low PPFD, plantlets grown at 22.5 g dm -3 sucrose showed slightly higher photosynthetic response to increasing PPFD than those at 45.0 g dm -3 but high sucrose concentration inhibited photosynthetic response ( Fig.…”

Section: Resultsmentioning

confidence: 89%

High irradiance can minimize the negative effect of exogenous sucrose on the photosynthetic capacity of in vitro grown coconut plantlets

Fuentes¹,

Talavera²,

Desjardins³

et al. 2005

Biologia plant.

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There is increasing evidence that the sucrose normally added to the culture medium affects negatively the photosynthetic capacity of plantlets. At the same time, however, sucrose cannot be eliminated from the medium, as it is required for normal in vitro growth. We argue that this is true only under the conventional light conditions of growth-rooms. In the present paper irradiance of growth-rooms was increased 10 times and although the sucrose-inhibitory effect was found at high sucrose concentrations, it was possible to grow coconut (Cocos nucifera L.) plantlets without sucrose. Those plantlets showed both high photosynthetic capacity and comparable in vitro growth to those grown with sucrose in the medium under conventional growth-room irradiance. Nevertheless, the best growth was achieved under mixotrophic conditions where at high irradiance and moderate sucrose concentrations plantlets accumulated 27 % more biomass than plantlets grown without sucrose under high irradiance and 43 and 73 % more biomass than their counterparts at low irradiance with or without sucrose, respectively.Additional key words: chlorophyll fluorescence, carboxylation efficiency, dark respiration rate, ex vitro transfer, light response curve, net photosynthetic rate.

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“…Light response curves (0–1200 μmol m −2 sec −1 PAR) were analysed as described in Akhkha et al . ().…”

Section: Methodsmentioning

confidence: 97%

Lack of fructose 2,6‐bisphosphate compromises photosynthesis and growth in Arabidopsis in fluctuating environments

McCormick

Kruger

2015

The Plant Journal

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SUMMARYThe balance between carbon assimilation, storage and utilisation during photosynthesis is dependent on partitioning of photoassimilate between starch and sucrose, and varies in response to changes in the environment. However, the extent to which the capacity to modulate carbon partitioning rapidly through shortterm allosteric regulation may contribute to plant performance is unknown. Here we examine the physiological role of fructose 2,6-bisphosphate (Fru-2,6-P 2 ) during photosynthesis, growth and reproduction in Arabidopsis thaliana (L.). In leaves this signal metabolite contributes to coordination of carbon assimilation and partitioning during photosynthesis by allosterically modulating the activity of cytosolic fructose-1,6-bisphosphatase. Three independent T-DNA insertional mutant lines deficient in 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (F2KP), the bifunctional enzyme responsible for both the synthesis and degradation of Fru-2,6-P 2 , lack Fru-2,6-P 2 . These plants have normal steady-state rates of photosynthesis, but exhibit increased partitioning of photoassimilate into sucrose and have delayed photosynthetic induction kinetics. The F2KP-deficient plants grow normally in constant environments, but show reduced growth and seed yields relative to wildtype plants in fluctuating light and/or temperature. We conclude that Fru-2,6-P 2 is required for optimum regulation of photosynthetic carbon metabolism under variable growth conditions. These analyses suggest that the capacity of Fru-2,6-P 2 to modulate partitioning of photoassimilate is an important determinant of growth and fitness in natural environments.

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Photosynthetic light response curves determined with the leaf oxygen electrode: minimisation of errors and significance of the convexity term

Cited by 18 publications

References 9 publications

A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau

A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau

High irradiance can minimize the negative effect of exogenous sucrose on the photosynthetic capacity of in vitro grown coconut plantlets

Lack of fructose 2,6‐bisphosphate compromises photosynthesis and growth in Arabidopsis in fluctuating environments

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