Estimation of diffusive resistance of bundle sheath cells to CO2 from modeling of C4 photosynthesis

He, D.; Edwards, Gerald E.

doi:10.1007/bf00034781

Cited by 49 publications

(40 citation statements)

References 28 publications

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“…g bs was estimated from the least-square difference between predicted and observed leaf discrimination using data obtained from the first 1-h RGB measurements (Kromdijk et al, 2010;Ubierna et al, 2011 (He and Edwards, 1996;von Caemmerer and Furbank, 2003).…”

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The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality

et al. 2014

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Unequal absorption of photons between photosystems I and II, and between bundle-sheath and mesophyll cells, are likely to affect the efficiency of the CO 2 -concentrating mechanism in C 4 plants. Under steady-state conditions, it is expected that the biochemical distribution of energy (ATP and NADPH) and photosynthetic metabolite concentrations will adjust to maintain the efficiency of C 4 photosynthesis through the coordination of the C 3 (Calvin-Benson-Bassham) and C 4 (CO 2 pump) cycles. However, under transient conditions, changes in light quality will likely alter the coordination of the C 3 and C 4 cycles, influencing rates of CO 2 assimilation and decreasing the efficiency of the CO 2 -concentrating mechanism. To test these hypotheses, we measured leaf gas exchange, leaf discrimination, chlorophyll fluorescence, electrochromatic shift, photosynthetic metabolite pools, and chloroplast movement in maize (Zea mays) and Miscanthus 3 giganteus following transitional changes in light quality. In both species, the rate of net CO 2 assimilation responded quickly to changes in light treatments, with lower rates of net CO 2 assimilation under blue light compared with red, green, and blue light, red light, and green light. Under steady state, the efficiency of CO 2 -concentrating mechanisms was similar; however, transient changes affected the coordination of C 3 and C 4 cycles in M. giganteus but to a lesser extent in maize. The species differences in the ability to coordinate the activities of C 3 and C 4 cycles appear to be related to differences in the response of cyclic electron flux around photosystem I and potentially chloroplast rearrangement in response to changes in light quality.

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The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality

et al. 2014

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“…In contrast, the response of C 4 crops to future elevated [CO 2 ] is uncertain. In C 4 plants, Rubisco is localized in the bundle sheath cell chloroplasts, where [CO 2 ] is 3 to 6 times higher than in the atmosphere (He and Edwards, 1996;Kiirats et al, 2002;von Caemmerer and Furbank, 2003). Thus, C 4 crops avoid photorespiration, are CO 2 saturated at the current atmospheric [CO 2 ], and should not theoretically display greater A at elevated [CO 2 ].…”

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Photosynthesis, Productivity, and Yield of Maize Are Not Affected by Open-Air Elevation of CO2 Concentration in the Absence of Drought

et al. 2006

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(A.R.) While increasing temperatures and altered soil moisture arising from climate change in the next 50 years are projected to decrease yield of food crops, elevated CO 2 concentration ([CO 2 ]) is predicted to enhance yield and offset these detrimental factors. However, C 4 photosynthesis is usually saturated at current [CO 2 Global climate change, in the form of rising temperature and altered soil moisture, is projected to decrease the yield of food crops over the next 50 years (Thomson et al., 2005). Meanwhile, the simultaneous increase in CO 2 concentration ([CO 2 ]) is predicted to stimulate crop production and offset these detrimental components of climate change (Thomson et al., 2005). This encouraging projection results from speciesspecific ''CO 2 fertilization'' factors in yield models (Phillips et al., 1996;Brown and Rosenberg, 1999;Parry et al., 2004;Thomson et al., 2005). These simulate the enhancements of net CO 2 assimilation rate (A) and yield observed, for both C 3 (17%-29%) and C 4 crops (6%-10%), under elevated [CO 2 ] in controlled environment studies (Kimball, 1983;Allen et al., 1987).While early projections of ''[CO 2 ] fertilization'' were based on studies in glasshouses and other protected environments, Free-Air Concentration Enrichment (FACE) experiments are fully open-air trials of crop performance. They provide realistic simulations of future growing conditions and provide perhaps the best opportunity to requantify CO 2 fertilization effects and elucidate the mechanism of crop response. FACE experiments on the C 3 crops rice (Oryza sativa), wheat (Triticum aestivum), and soybean (Glycine max) have observed smaller increases in yield than were predicted from the early chamber studies Long et al., 2005;Morgan et al., 2005). Yet the primary response mechanisms of C 3 crops have not been controversial . First, elevated [CO 2 ] directly stimulates A, growth, and yield by decreasing photorespiration and accelerating carboxylation by Rubisco. Second, it decreases stomatal aperture, which can reduce plant water use and indirectly enhance performance by ameliorating water stress. In contrast, the response of C 4 crops to future elevated [CO 2 ] is uncertain. In C 4 plants, Rubisco is

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“…) is an essential component of the C 4 CO 2 -concentrating mechanism and limits the amount of direct fixation of CO 2 under ambient CO 2 concentrations Brown and Byrd, 1993;He and Edwards, 1996;von Caemmerer, 2000;Kiirats et al, 2002). Therefore, even when the initial carboxylation reaction of the C 4 pump is limited by low CA activity or low light, there would be little, if any, direct fixation of CO 2 in the BSC and minimal influence on D 2 out of the BSC would change the fractionation factor associated with CO 2 leakage from the BSC (s from Eq.…”

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Carbonic Anhydrase and Its Influence on Carbon Isotope Discrimination during C4 Photosynthesis. Insights from Antisense RNA in Flaveria bidentis

2006

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In C 4 plants, carbonic anhydrase (CA) facilitates both the chemical and isotopic equilibration of atmospheric CO 2 and bicarbonate (HCO 3 2 ) in the mesophyll cytoplasm. The CA-catalyzed reaction is essential for C 4 photosynthesis, and the model of carbon isotope discrimination (D 13 C) in C 4 plants predicts that changes in CA activity will influence D 13 C. However, experimentally, the influence of CA on D 13C has not been demonstrated in C 4 plants. Here, we compared measurements of D 13 C during C 4 photosynthesis in Flaveria bidentis wild-type plants with F. bidentis plants with reduced levels of CA due to the expression of antisense constructs targeted to a putative mesophyll cytosolic CA. Plants with reduced CA activity had greater D 13 C, which was also evident in the leaf dry matter carbon isotope composition (d 13 C). Contrary to the isotope measurements, photosynthetic rates were not affected until CA activity was less than 20% of wild type. Measurements of D 13 C, d 13 C of leaf dry matter, and rates of net CO 2 assimilation were all dramatically altered when CA activity was less than 5% of wild type. CA activity in wild-type F. bidentis is sufficient to maintain net CO 2 assimilation; however, reducing leaf CA activity has a relatively large influence on D 13 C, often without changes in net CO 2 assimilation. Our data indicate that the extent of CA activity in C 4 leaves needs to be taken into account when using D 13 C and/or d 13 C to model the response of C 4 photosynthesis to changing environmental conditions.

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Estimation of diffusive resistance of bundle sheath cells to CO2 from modeling of C4 photosynthesis

Cited by 49 publications

References 28 publications

The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality

The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality

Photosynthesis, Productivity, and Yield of Maize Are Not Affected by Open-Air Elevation of CO2 Concentration in the Absence of Drought

Carbonic Anhydrase and Its Influence on Carbon Isotope Discrimination during C4 Photosynthesis. Insights from Antisense RNA in Flaveria bidentis

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