Transcriptomics and Genetics Associated with Plant Responses to Elevated CO2 Atmospheric Concentrations

Souza, Amanda P. De; Arenque, Bruna Cersózimo; Tavares, Eveline Q. P.; Buckeridge, Marcos Silveira

doi:10.1007/978-1-4939-3536-9_4

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Section: Introductionmentioning

confidence: 99%

“…The responses and adaptations of plants to e[CO 2 ] have been well characterized at physiological level; however, much less is known about the molecular mechanisms and signaling events that underlie these adaptations ( De Souza et al , 2016 ; Becklin et al , 2017 ). Microarray and RNA-sequencing techniques have shown that e[CO 2 ] can have a great impact on gene expression in plants ( De Souza et al , 2016 ). Fukayama et al (2009) demonstrated that e[CO 2 ] significantly alters the expression of rice genes involved in signal transduction and transcription regulation, and they went on to show that genes involved in CO 2 fixation are down-regulated by e[CO 2 ], while genes involved in RuBP generation and starch synthesis are up-regulated ( Fukayama et al , 2011 ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%