Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae)

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	Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae)
	Zhang, Yizhi; Yin, Liyan; Jiang, Hong-Sheng; Li, Wei; Gontero, Brigitte; Maberly, Stephen C.
刊名	PHOTOSYNTHESIS RESEARCH
	2014
英文摘要	Two freshwater macrophytes, Ottelia alismoides and O. acuminata, were grown at low (mean 5 mu mol L-1) and high (mean 400 mu mol L-1) CO2 concentrations under natural conditions. The ratio of PEPC to RuBisCO activity was 1.8 in O. acuminata in both treatments. In O. alismoides, this ratio was 2.8 and 5.9 when grown at high and low CO2, respectively, as a result of a twofold increase in PEPC activity. The activity of PPDK was similar to, and changed with, PEPC (1.9-fold change). The activity of the decarboxylating NADP-malic enzyme (ME) was very low in both species, while NAD-ME activity was high and increased with PEPC activity in O. alismoides. These results suggest that O. alismoides might perform a type of C-4 metabolism with NAD-ME decarboxylation, despite lacking Kranz anatomy. The C-4-activity was still present at high CO2 suggesting that it could be constitutive. O. alismoides at low CO2 showed diel acidity variation of up to 34 mu equiv g(-1) FW indicating that it may also operate a form of crassulacean acid metabolism (CAM). pH-drift experiments showed that both species were able to use bicarbonate. In O. acuminata, the kinetics of carbon uptake were altered by CO2 growth conditions, unlike in O. alismoides. Thus, the two species appear to regulate their carbon concentrating mechanisms differently in response to changing CO2. O. alismoides is potentially using three different concentrating mechanisms. The Hydrocharitaceae have many species with evidence for C-4, CAM or some other metabolism involving organic acids, and are worthy of further study.
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/396]
专题	中国科学院武汉植物园
推荐引用方式 GB/T 7714	Zhang, Yizhi,Yin, Liyan,Jiang, Hong-Sheng,et al. Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae)[J]. PHOTOSYNTHESIS RESEARCH,2014.
APA	Zhang, Yizhi,Yin, Liyan,Jiang, Hong-Sheng,Li, Wei,Gontero, Brigitte,&Maberly, Stephen C..(2014).Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae).PHOTOSYNTHESIS RESEARCH.
MLA	Zhang, Yizhi,et al."Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae)".PHOTOSYNTHESIS RESEARCH (2014).