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The impact of ozone on juvenile maize (Zea mays L.) plant photosynthesis: effects on vegetative biomass, pigmentation, and carboxylases (PEPc and Rubisco).
Plant Biol (Stuttg). 2007 Jul; 9(4):478-88.PB

Abstract

The impact of ozone on crops was more studied in C (3) than in C (4) species. In C (3) plants, ozone is known to induce a photosynthesis impairment that can result in significant depressions in biomass and crop yields. To investigate the impact of O (3) on C (4) plant species, maize seedlings (ZEA MAYS L. cv. Chambord) were exposed to 5 atmospheres in open-top chambers: non-filtered air (NF, 48 nL L (-1) O (3)) and NF supplied with 20 (+ 20), 40 (+ 40), 60 (+ 60), and 80 (+ 80) nL L (-1) ozone. An unchambered plot was also available. Leaf area, vegetative biomass, and leaf dry mass per unit leaf area (LMA) were evaluated 33 days after seedling emergence in OTCs. At the same time, photosynthetic pigments as well as carboxylase (PEPc and Rubisco) activities and amounts were also examined in the 5th leaf. Ozone enhanced visible symptoms characterizing foliar senescence. Across NF, + 20, + 40, and + 60 atmospheres, both chlorophylls and carotenoids were found to be linearly decreased against increasing AOT40 (CA. - 50 % in + 60). No supplementary decrease was observed between + 60 and + 80. Total above-ground biomass was reduced by 26 % in + 80 atmosphere; leaf dry matter being more depressed by ozone than leaf area. In some cases, LMA index was consistent to reflect low negative effects caused by a moderate increase in ozone concentration. PEPc and Rubisco were less sensitive to ozone than pigments: only the two highest external ozone doses reduced their activities by about 20 - 30 %. These changes might be connected to losses in PEPc and Rubisco proteins that were decreased by about one-third. The underlying mechanisms for these results were discussed with special reference to C (3) species. To conclude, we showed that both light and dark reactions of C (4) photosynthesis can be impaired by realistic ozone doses.

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Authors+Show Affiliations

Leitao L
Laboratoire d'Ecologie Moléculaire - IBEAS - EA3525, Université de Pau et des Pays de l'Adour, Avenue de l'Université, BP 1155, 64013 Pau Cedex, France.
Bethenod O
No affiliation info available
Biolley JP
No affiliation info available

MeSH

BiomassCarotenoidsChlorophyllChloroplastsOzonePhosphoenolpyruvate CarboxylasePhotosynthesisPigmentationPlant LeavesRibulose-Bisphosphate CarboxylaseZea mays

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17401809

Citation

Leitao, L, et al. "The Impact of Ozone On Juvenile Maize (Zea Mays L.) Plant Photosynthesis: Effects On Vegetative Biomass, Pigmentation, and Carboxylases (PEPc and Rubisco)." Plant Biology (Stuttgart, Germany), vol. 9, no. 4, 2007, pp. 478-88.
Leitao L, Bethenod O, Biolley JP. The impact of ozone on juvenile maize (Zea mays L.) plant photosynthesis: effects on vegetative biomass, pigmentation, and carboxylases (PEPc and Rubisco). Plant Biol (Stuttg). 2007;9(4):478-88.
Leitao, L., Bethenod, O., & Biolley, J. P. (2007). The impact of ozone on juvenile maize (Zea mays L.) plant photosynthesis: effects on vegetative biomass, pigmentation, and carboxylases (PEPc and Rubisco). Plant Biology (Stuttgart, Germany), 9(4), 478-88.
Leitao L, Bethenod O, Biolley JP. The Impact of Ozone On Juvenile Maize (Zea Mays L.) Plant Photosynthesis: Effects On Vegetative Biomass, Pigmentation, and Carboxylases (PEPc and Rubisco). Plant Biol (Stuttg). 2007;9(4):478-88. PubMed PMID: 17401809.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The impact of ozone on juvenile maize (Zea mays L.) plant photosynthesis: effects on vegetative biomass, pigmentation, and carboxylases (PEPc and Rubisco). AU - Leitao,L, AU - Bethenod,O, AU - Biolley,J-P, Y1 - 2007/04/02/ PY - 2007/4/3/pubmed PY - 2007/9/22/medline PY - 2007/4/3/entrez SP - 478 EP - 88 JF - Plant biology (Stuttgart, Germany) JO - Plant Biol (Stuttg) VL - 9 IS - 4 N2 - The impact of ozone on crops was more studied in C (3) than in C (4) species. In C (3) plants, ozone is known to induce a photosynthesis impairment that can result in significant depressions in biomass and crop yields. To investigate the impact of O (3) on C (4) plant species, maize seedlings (ZEA MAYS L. cv. Chambord) were exposed to 5 atmospheres in open-top chambers: non-filtered air (NF, 48 nL L (-1) O (3)) and NF supplied with 20 (+ 20), 40 (+ 40), 60 (+ 60), and 80 (+ 80) nL L (-1) ozone. An unchambered plot was also available. Leaf area, vegetative biomass, and leaf dry mass per unit leaf area (LMA) were evaluated 33 days after seedling emergence in OTCs. At the same time, photosynthetic pigments as well as carboxylase (PEPc and Rubisco) activities and amounts were also examined in the 5th leaf. Ozone enhanced visible symptoms characterizing foliar senescence. Across NF, + 20, + 40, and + 60 atmospheres, both chlorophylls and carotenoids were found to be linearly decreased against increasing AOT40 (CA. - 50 % in + 60). No supplementary decrease was observed between + 60 and + 80. Total above-ground biomass was reduced by 26 % in + 80 atmosphere; leaf dry matter being more depressed by ozone than leaf area. In some cases, LMA index was consistent to reflect low negative effects caused by a moderate increase in ozone concentration. PEPc and Rubisco were less sensitive to ozone than pigments: only the two highest external ozone doses reduced their activities by about 20 - 30 %. These changes might be connected to losses in PEPc and Rubisco proteins that were decreased by about one-third. The underlying mechanisms for these results were discussed with special reference to C (3) species. To conclude, we showed that both light and dark reactions of C (4) photosynthesis can be impaired by realistic ozone doses. SN - 1435-8603 UR - https://www.unboundmedicine.com/medline/citation/17401809/The_impact_of_ozone_on_juvenile_maize__Zea_mays_L___plant_photosynthesis:_effects_on_vegetative_biomass_pigmentation_and_carboxylases__PEPc_and_Rubisco__ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2007-964942 DB - PRIME DP - Unbound Medicine ER -