The impact of ozone on juvenile maize (Zea mays L.) plant photosynthesis: Effects on vegetative biomass, pigmentation, and carboxylases (PEPc and Rubisco)

Autor: Jean-Philippe Biolley, Olivier Bethenod, Louis Leitao
Přispěvatelé: Laboratoire d'Ecologie Moléculaire, IBEAS, EA 3525, Université de Pau et des Pays de l'Adour (UPPA), Environnement et Grandes Cultures (EGC), AgroParisTech-Institut National de la Recherche Agronomique (INRA), Laboratoire d'Ecologie Moléculaire, Institut National de la Recherche Agronomique (INRA)-AgroParisTech
Jazyk: angličtina
Rok vydání: 2007
Předmět:
0106 biological sciences
Chlorophyll
PIGMENT
Ozone
Chloroplasts
5-BISPHOSPHATE CARBOXYLASE/OXYGENASE (RUBISCO)
Ribulose-Bisphosphate Carboxylase
[SDV]Life Sciences [q-bio]
Plant Science
Photosynthesis
01 natural sciences
Zea mays
03 medical and health sciences
chemistry.chemical_compound
PHOSPHOENOLPYRUVATE CARBOXYLASE (PEPc)
Dry weight
Botany
Dry matter
Biomass
Carotenoid
Ecology
Evolution
Behavior and Systematics
030304 developmental biology
chemistry.chemical_classification
0303 health sciences
biology
LEAF MASS PER AREA (LMA)
OZONE
Pigmentation
RuBisCO
General Medicine
15. Life on land
ECOPHYSIOLOGIE
biology.organism_classification
Carotenoids
Phosphoenolpyruvate Carboxylase
Plant Leaves
chemistry
Seedling
biology.protein
RIBULOSE-1
Phosphoenolpyruvate carboxylase
INDICE FOLIAIRE
MAIZE
010606 plant biology & botany
Zdroj: Plant Biology
Plant Biology, Wiley, 2007, 9 (4), pp.478-488. ⟨10.1055/s-2007-964942⟩
ISSN: 1435-8603
1438-8677
DOI: 10.1055/s-2007-964942⟩
Popis: 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.
Databáze: OpenAIRE
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