CO<sub>2</sub>response curves can be measured with a field-portable closed-loop photosynthesis system

McDermitt, D. K.; Norman, John M.; Davis, James; Ball, Tyler; Arkebauer, Timothy J.; Welles, J. M.; Roerner, S.R.

doi:10.1051/forest:19890593

Cited by 67 publications

(37 citation statements)

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“…The second fully expanded leaf from the apical meristem was selected for the measurements. The leaf was enclosed in the plexiglass assimilation chamber (4.5 x 11.8 x 7.3 cm) of the Li-Cor 6200 photosynthesis system (Lincoln, NE, USA) following the procedure described by McDermitt et al (1989). Temperature, light intensity, and relative humidity were maintained near constant during all the measurements.…”

Section: Photosynthetic Measurementmentioning

confidence: 99%

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Evans¹,

Al-Hamdani²

2015

JEBAS

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This greenhouse study was carried out to determine the impact of drought on plant growth, photosynthetic rate and the recovery of photosynthesis after drought relief. Twenty four Roselle plants were equally divided between the control and the treatment groups, which received 100% and 25% soil saturation respectively. The plants were grown under greenhouse conditions with the temperature averaging 27 ± 2ºC. The treatments were applied with seven cycles of watering until the plants reached the anthesis stage. The drought influence caused a significant reduction in the plant height, flower number, and photosynthetic rate. Re-watering the plants growing under drought to 100% water saturation resulted in complete recovery of photosynthetic rate within forty-eight hours. However, rewatering to 25% showed only 30% recovery in photosynthetic rate after forty-eight hours. Photosynthetic pigments including chlorophyll a, b and carotenoid were not significantly influenced by the drought. Similarly, total phenolic compound concentration of the calyx was insignificant between the treatments. However, Anthocyanin concentration of the calyx was significantly higher under the drought treatment.

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Section: Photosynthetic Measurementmentioning

confidence: 99%

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Evans¹,

Al-Hamdani²

2015

JEBAS

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“…The selected leaf of each plant was enclosed in a flow-through plexiglass assimilation chamber (4.5 × 11.8 × 7.3 cm) of a Li-Cor 6200 photosynthesis system (Lincoln, NE) as described by McDermitt et al (1989). These gas exchange measurements were made 4 h after the onset of the light period of the sampling day.…”

Section: Gas Exchange Measurementsmentioning

confidence: 99%

Selected physiological responses of kudzu to different chromium concentrations

Connell

Al-Hamdani²

2001

Can. J. Plant Sci.

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Connell, S. L. and Al-Hamdani, S. H. 2001. Selected physiological responses of kudzu to different chromium concentrations. Can. J. Plant Sci. 81: 53-58. This study was designed to evaluate the potential use of kudzu (Pueraria montana var. lobata) as a phytoremediator to reduce Cr (VI) contamination. In addition, the effect of Cr concentrations of 4, 8, and 12 mg L -1 on kudzu growth, gas exchange, pigment concentration, and carbohydrate accumulation were evaluated. In general, Cr uptake by kudzu was increased as Cr concentration increased in the growing media. Most of the Cr taken up by kudzu was accumulated in the root as indicated by the significantly higher ratio of root/shoot Cr concentrations at increasing Cr levels in the root environment. Kudzu growth, photosynthetic rate, and chlorophyll a and b concentrations declined as the Cr concentration increased. The decrease in photosynthesis was independent of the internal carbon dioxide. Anthocyanin was found to increase as Cr concentration gradually increased from 4 to 12 mg L -1 . Kudzu clearly demonstrated its ability to survive at Cr concentrations up to 8 mg L -1 in the root environment. Kudzu, therefore, can be considered as a replacement crop in areas of Cr contamination falling within the concentration range of this study.

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“…The relationships between gw and ambient CO 2 (c.a.) were established on four plants per treatment by means of a portable photosynthesis chamber (LI 6200, LI-COR Inc., Lincoln, Nebraska) as described by McDermitt et al [29]. Four to five leaves per plant were enclosed into a 4 l assimilation chamber, and the CO 2 mole fraction (c a ) was increased to about 950 µmol mol -1 by breathing into the chamber.…”

Section: Stomatal Movements and Photosynthesismentioning

confidence: 99%

Consequences of an excess Al and a deficiency in Ca and Mg for stomatal functioning and net carbon assimilation of beech leaves

Ridolfi

Garrec

2000

Ann. For. Sci.

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-Stomatal function and photosynthesis were investigated in beech seedlings submitted to excess Al, or/and to a deficiency in Ca and Mg. Excess Al in the nutrient solution promoted a decrease of Ca and Mg leaf contents, while K was increased. Stomatal responses to darkness, ABA and ambient CO 2 remained normal. In contrast, steady-state stomatal conductance in light was significantly smaller and correlated to a lower accumulation of K in the guard cells. Similar stomatal responses were observed for Ca-Mg deficient plants. In response to combined Al stress and low Ca and Mg nutrition, stomata remained almost insensitive to the different stimuli. The constancy in K guard cell concentration revealed a disturbance in K fluxes. Lower CO 2 assimilation rates and chlorophyll contents, on a leaf area basis, were recorded in response to all treatments. In conclusion, excess Al associated to low Ca and Mg nutrition lead to a strong stomatal dysfonction and reduced photosynthesis of beech seedlings.

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CO₂response curves can be measured with a field-portable closed-loop photosynthesis system

Cited by 67 publications

References 0 publications

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Selected physiological responses of kudzu to different chromium concentrations

Consequences of an excess Al and a deficiency in Ca and Mg for stomatal functioning and net carbon assimilation of beech leaves

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CO2response curves can be measured with a field-portable closed-loop photosynthesis system

Cited by 67 publications

References 0 publications

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Selected physiological responses of roselle (Hibiscus sabdariffa) to drought stress

Selected physiological responses of kudzu to different chromium concentrations

Consequences of an excess Al and a deficiency in Ca and Mg for stomatal functioning and net carbon assimilation of beech leaves

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Product

Resources

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CO₂response curves can be measured with a field-portable closed-loop photosynthesis system