Elevated CO&lt;sub&gt;2&lt;/sub&gt; and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (&lt;i&gt;Oryza sativa&lt;/i&gt; L.) Cultivars

Razzaque, Mohammed Abdur; Haque, MM; Hamid, Abdul

doi:10.3329/agric.v7i1.5588

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The Pn significantly increased in maize under long-term exposure to eCO 2 at 450 and 550 ppm CO 2 as compared to 390 ppm (Meng et al 2014). Long-term exposure to eCO 2 (570±50 ppm CO 2 ) increased the Pn by 24.2 and 25.4% compared with ambient CO 2 (~360 ppm CO 2 ) and field grown rice plants (Razzaque et al 2009). Long-term exposure to eCO 2 increased the Pn during flowering by 46 and 104%, while that during pod maturation by 23 and 14% than that in ambient CO 2 and field conditions, respectively in mung…”

Section: The Pn Response To Photosynthetic Photon Flux Densitymentioning

confidence: 92%

“…In potato, tuber yield increased up to 1000 ppm (Wheeler et al 1994). Yields of many crops (wheat, rice, maize, soybean, cotton, castor bean, vegetable crops) have significantly increased at eCO 2 concentrations (Reddy and Hodges 2000, Chowdhury et al 2005, De Souza et al 2008, Vanaja et al 2008, Razzaque et al 2009, Singh and Jasrai 2012, O'Leary et al 2015, Zhang et al 2015. Sweet potato storage root yield has been reported to increase up to 750 ppm CO 2 (Mortley et al 1996).…”

Section: The Pn Response To Photosynthetic Photon Flux Densitymentioning

confidence: 99%

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Photosynthetic response of sweet potato (Ipomoea batatas) to photon flux density and elevated carbon dioxide

Ravi¹,

Saravanan²,

Byju³

et al. 2017

Indian J Agri Sci

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The continuous rise in the atmospheric CO2 due to anthropogenic activities is likely to benefit crop species with C3photosynthetic pathway by enhancing photosynthetic efficiency and crop productivity. This is particularly importantin the context of climate change and food security of ever increasing population amidst scarcity of natural resources.In the search of photosynthetically efficient climate smart genotypes. In the present study, the net photosynthetic rate(Pn), stomatal conductance (gs) and intercellular CO2 (Ci) was studied in twelve contrasting sweet potato genotypes,viz. Sree Arun, Sree Badhra, Sree Kanaka, Kanhangad, Pusa Safed, Pusa Red, Kisan, Gouri, Sankar and ST-13, S-1464and S-1466 under ambient (400 ppm) and eCO2 (eCO2) (600, 800 and 1000 ppm) and the Pn at photosynthetic photonflux densities (PPFDs), viz. 200, 400, 600, 800, 1000, 1200 and 1500 Î¼mol/m2/h at 30oC and 400 ppm CO2 usingportable photosynthesis system. The maximum Pn of ten sweet potato genotypes was recorded at PPFD of 1500Î¼mol/m2/s and the increase in Pn at PPFDs above 1000 Î¼mol/m2/s were insignificant. The Pn steadily increased dueto short-term (ten minutes) exposure at eCO2 concentrations between 400 ppm and 1000 ppm in twelve sweet potatogenotypes. The sweet potato genotypes had the average Pn of 26.30, 33.41, 38.02 and 40.32 Î¼mol/m2/s at 400, 600,800 and 1000 ppm CO2 respectively. However, the per cent of increment in Pn at eCO2 significantly declined (average5.98%) at CO2 concentrations above 800 ppm. The genotypes Gouri, Sankar, Sree Arun, and S1466 had 61.00 â€“ 74.3%hike in Pn at eCO2 (1000 ppm) as compared to ambient CO2 (400 ppm). The per cent increment in Pn significantlydecreased at CO2 concentrations above 600 ppm. The differences in Pn were statistically significant across sweetpotato genotypes and CO2 concentrations (P>0.001), whereas the Pn had a quadratic relation with the increase inCO2 concentration (R2=0.603). The gs steadily decreased at eCO2 concentrations. The sweet potato genotypes hadthe average gs of 0.606, 0.508, 0.431, 0.376 mol H2O/m2/s at 400, 600, 800 and 1000 ppm CO2 respectively. Theper cent of decrease in gs at eCO2 significantly increased (average 38.33%) at 1000 ppm CO2. The differences ings were statistically significant across sweet potato genotypes and CO2 concentrations (P>0.001). The sweet potatogenotypes had the average Ci of 271.50, 405.20, 543.00, and 684.00 Î¼mol CO2/mol air at 400, 600, 800 and 1000ppm CO2 respectively. However, the per cent of increment in Ci at eCO2 significantly declined (average 25.70%) atCO2 concentrations above 600 ppm. The differences in Ci were statistically significant across sweet potato genotypesand CO2 concentrations (P>0.001), whereas the Pn had a quadratic relation with the increase in Ci (R2=0.504). Theinteraction effect of genotypes and CO2 concentration on Ci, Pn and gs was insignificant. The differences in the totalchlorophyll and protein content in the leaves of sweet potato genotypes were statistically significant. Nevertheless,the gas exchange parameters were not influenced by the total chlorophyll and protein content.

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Section: The Pn Response To Photosynthetic Photon Flux Densitymentioning

confidence: 92%

Section: The Pn Response To Photosynthetic Photon Flux Densitymentioning

confidence: 99%

Photosynthetic response of sweet potato (Ipomoea batatas) to photon flux density and elevated carbon dioxide

Ravi¹,

Saravanan²,

Byju³

et al. 2017

Indian J Agri Sci

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Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide

Ravi,

Raju,

2024

Funct. Plant Biol.

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Cassava (Manihot esculenta Crantz), an important tropical crop, is affected by extreme climatic events, including rising CO2 levels. We evaluated the short-term effect of elevated CO2 concentration (ECO2) (600, 800 and 1000 ppm) on the photosynthetic efficiency of 14 cassava genotypes. ECO2 significantly altered gaseous exchange parameters (net photosynthetic rate (Pn), stomatal conductance (gs), intercellular CO2 (Ci) and transpiration (E)) in cassava leaves. There were significant but varying interactive effects between ECO2 and varieties on these physiological characteristics. ECO2 at 600 and 800 ppm increased the Pn rate in the range of 13–24% in comparison to 400 ppm (ambient CO2), followed by acclimation at the highest concentration of 1000 ppm. A similar trend was observed in gs and E. Conversely, Ci increased significantly and linearly across increasing CO2 concentration. Along with Ci, a steady increase in water use efficiency [WUEintrinsic (Pn/gs) and WUEinstantaneous (Pn/E)] across various CO2 concentrations corresponded with the central role of restricted stomatal activity, a common response under ECO2. Furthermore, Pn had a significant quadratic relationship with the ECO2 (R2 = 0.489) and a significant and linear relationship with Ci (R2 = 0.227). Relative humidity and vapour pressure deficit during the time of measurements remained at 70–85% and ~0.9–1.31 kPa, respectively, at 26 ± 2°C leaf temperature. Notably, not a single variety exhibited constant performance for any of the parameters across CO2 concentrations. Our results indicate that the potential photosynthesis can be increased up to 800 ppm cassava varieties with high sink capacity can be cultivated under protected cultivation to attain higher productivity.

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Elevated CO<sub>2</sub> and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (<i>Oryza sativa</i> L.) Cultivars

Cited by 2 publications

References 18 publications

Photosynthetic response of sweet potato (Ipomoea batatas) to photon flux density and elevated carbon dioxide

Photosynthetic response of sweet potato (Ipomoea batatas) to photon flux density and elevated carbon dioxide

Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide

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