The Effects of Cd2+ Stress on Photosystem Ⅱ Functioning of Rice (Oryza Sativa L.) Leaves Under Elevated Co2 Level

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

“…A negative K-peak indicates the integrity of the functional antenna. If the K-peak is positive, it means that the OEC is suppressed (Li et al 2015;Li et al 2021). Our experimental results are similar to Kalaji's results which showed that the O-J-I-P curve of barley seedlings changed significantly after seven days of Pb stress (Kalaji et al 2007).…”

“…This is similar to the results of Kalaji's study (Kalaji et al 2007). Our study also obtained similar results in using Cd (cadmium) to stress rice seedlings (Li et al 2021). The decrease of the above two parameters indicated that severe Pb toxcity had obvious damage to the photosynthetic performance of rice seedlings.…”

Transcriptomics and Metabolomics Analysis Reveal the Molecular Responses of Rice to Cd Stress And/Or Elevated Co2 Concentration

“…Os04g0457100 and Os10g0533500 were signi cantly down-regulated in photosynthesis-antenna protein, and carotenoid biosynthesis. That indicates that the photosynthetic process of rice has been adversely affected, which has been veri ed by our previous study (Li et al 2021).…”

“…Os02g0578400 annotation is most signi cant in photosynthesis, Os08g0473900 is annotated in starch metabolism and sucrose metabolism. Those results showed that EC promoted photosynthesis, growth and energy metabolism of rice to a certain extent, which can be veri ed by our early studies (Li et al 2021;Wang et al 2021); 1064 DEGs were down-regulated, mainly annotated in carotenoid biosynthesis, photosynthesis-antenna proteins, and plant hormone signal transduction, etc. In the photosynthesisantenna proteins, Os01g0600900, Os09g0346500, Os04g0457100, Os03g0592500, Os07g0562700, Os11g0242800, Os01g0720500, Os02g0197600 and Os080g435900 were all down-regulated indicating that high CO 2 would inhibit the role of photosynthesis-antenna protein.…”

“…Cadmium and mercury pollutions are especially severer than other elements (Hang et al 2009; Xiao et al 2019). The plants under Cd stress can be affected in cell damages, production of toxic metabolites, inhibition of photosynthesis and respiration (Meng et hormones and organic acids contents of rice seedling leaves , and also could alleviate the damage of Pb stress by changes in hormone ratios and enhanced photosynthesis (Li et al 2021; Wang et al 2021). Other researchers have also studied the alleviating effects of elevated CO 2 when plants under heavy metals stresses (Tukaj et al 2007;Li et al 2010).…”