How elevated CO2 affects our nutrition in rice, and how we can deal with it

Ujiie, Kazuhiro; Ishimaru, Ken; Hirotsu, Naoki; Nagasaka, Seiji; Miyakoshi, Yuichi; M, Ota; Tokida, Takeshi; Sakai, Hidemitsu; Usui, Yasuhiro; Ono, Keisuke; Kobayashi, Kazuhiko; Nakano, Hiroshi; Yoshinaga, Satoshi; Kashiwagi, Takayuki; Magoshi, Jun

doi:10.1371/journal.pone.0212840

Cited by 35 publications

(29 citation statements)

References 34 publications

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“…Similar observations on changes in phosphorus content were also reported by earlier workers [38]. Recent evidence showed the contents of micronutrients including zinc to reduce under the effect of elevated CO 2 [39]. But, in the present study, the zinc and copper contents in grain were higher in mycorrhized plants at 550-ppm concentration, however, these micronutrient contents decreased at 700-ppm concentration and this result was also supported by earlier claims [40].…”

Section: Discussionsupporting

confidence: 93%

Understanding interaction effect of arbuscular mycorrhizal fungi in rice under elevated carbon dioxide conditions

et al. 2019

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Arbuscular mycorrhizal fungi (AMF), particularly the Glomerales group, play a paramount role in plant nutrient uptake, and abiotic and biotic stress management in rice, but recent evidence revealed that elevated CO2 concentration considerably reduces the Glomerales group in soil. In view of this, the present study was initiated to understand the interaction effect of native Glomerales species application in rice plants (cv. Naveen) under elevated CO2 concentrations (400 ± 10, 550 ± 20, and 700 ± 20 ppm) in open‐top chambers. Three different modes of application of the AMF inoculum were evaluated, of which, combined application of AMF at the seedling production and transplanting stages showed increased AMF colonization, which significantly improved grain yield by 25.08% and also increased uptake of phosphorus by 18.2% and nitrogen by 49.5%, as observed at 700‐ppm CO2 concentration. Organic acids secretion in rice root increased in AMF‐inoculated plants exposed to 700‐ppm CO2 concentration. To understand the overall effect of CO2 elevation on AMF interaction with the rice plant, principal component and partial least square regression analysis were performed, which found both positive and negative responses under elevated CO2 concentration.

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Section: Discussionsupporting

confidence: 93%

Understanding interaction effect of arbuscular mycorrhizal fungi in rice under elevated carbon dioxide conditions

et al. 2019

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Section: Discussionmentioning

confidence: 99%

“…It has been reported that Fe concentrations in some vegetative organs of rice are also reduced by e[CO 2 ] ( Seneweera and Conroy, 1997 ; Johnson, 2013 ; Ujiie et al , 2019 ). For example, Ujiie et al (2019) found that concentrations in leaf blades were reduced under FACE conditions compared to ambient [CO 2 ]. Consistent with the results reported by Seneweera and Conroy (1997) , we found that e[CO 2 ] decreased the Fe concentrations in both roots and shoots of the WT and transgenic plants at the seedling and tillering stages compared to ambient [CO 2 ] ( Fig.…”

Section: Discussionmentioning

confidence: 99%

A rice small GTPase, Rab6a, is involved in the regulation of grain yield and iron nutrition in response to CO2 enrichment

Chen

et al. 2020

Journal of Experimental Botany

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Despite extensive studies on the effects of elevated atmospheric CO2 concentrations ([CO2]) on rice, the molecular mechanisms and signaling events underlying the adaptation of plants remain largely elusive. Here, we report that OsRab6a, which encodes a small GTPase, is involved in the regulation of rice growth, grain yield, and accumulation of iron (Fe) in response to elevated [CO2] (e[CO2]). We generated transgenic plants with OsRab6a-overexpression (-OE) together with OsRab6a-RNAi lines, and found no differences in growth and grain yield among them and wild-type (WT) plants under ambient [CO2] conditions. Under e[CO2] conditions, growth and grain yield of the WT and OsRab6a-OE plants were enhanced, with a greater effect being observed in the latter. In contrast, there were no effects of e[CO2] on growth and grain yield of the OsRab6a-RNAi plants. Photosynthetic rates in both the WT and OsRab6a-OE plants were stimulated by e[CO2], with the magnitude of the increase being higher in OsRab6a-OE plants. Fe concentrations in vegetative tissues and the grain of the WT and transgenic plants were reduced by e[CO2], and the magnitude of the decrease was lower in the OE plants than in the WT and RNAi plants. Genes associated with Fe acquisition in the OsRab6a-OE lines exhibited higher levels of expression than those in the WT and the RNAi lines under e[CO2]. Analysis of our data using Dunnett’s multiple comparison test suggested that OsRab6a is an important molecular regulator that underlies the adaptation of rice to e[CO2] by controlling photosynthesis and Fe accumulation.

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“…Global climate change is another factor negatively influencing crop nutritional quality. Many crops grown under the predicted elevated atmospheric CO 2 concentration show an increase in yield, but a decrease in micronutrients (zinc, iron) and proteins (as nitrogen) (Loladze, 2014;Zhu et al, 2018;Ujiie et al, 2019). This decrease is partly due to an increased synthesis of carbohydrates at the expense of proteins, often referred to as the carbon dilution effect.…”

Section: Introductionmentioning

confidence: 99%

Ensuring Nutritious Food Under Elevated CO2 Conditions: A Case for Improved C4 Crops

2020

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Global climate change is a challenge for efforts to ensure food security for future generations. It will affect crop yields through changes in temperature and precipitation, as well as the nutritional quality of crops. Increased atmospheric CO 2 leads to a penalty in the content of proteins and micronutrients in most staple crops, with the possible exception of C 4 crops. It is essential to understand the control of nutrient homeostasis to mitigate this penalty. However, despite the importance of mineral nutrition for plant performance, comparably less is known about the regulation of nutrient uptake and homeostasis in C 4 plants than in C 3 plants and mineral nutrition has not been a strong focus of the C 4 research. Here we review what is known about C 4 specific features of nitrogen and sulfur assimilation as well as of homeostasis of other essential elements. We identify the major knowledge gaps and urgent questions for future research. We argue that adaptations in mineral nutrition were an integral part of the evolution of C 4 photosynthesis and should be considered in the attempts to engineer C 4 photosynthetic mechanisms into C 3 crops.

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How elevated CO2 affects our nutrition in rice, and how we can deal with it

Cited by 35 publications

References 34 publications

Understanding interaction effect of arbuscular mycorrhizal fungi in rice under elevated carbon dioxide conditions

Understanding interaction effect of arbuscular mycorrhizal fungi in rice under elevated carbon dioxide conditions

A rice small GTPase, Rab6a, is involved in the regulation of grain yield and iron nutrition in response to CO2 enrichment

Ensuring Nutritious Food Under Elevated CO2 Conditions: A Case for Improved C4 Crops

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