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Photosynthetica

, Volume 52, Issue 4, pp 519–528 | Cite as

Impact of elevated CO2 on growth, physiology, yield, and quality of tomato (Lycopersicon esculentum Mill) cv. Arka Ashish

  • H. Mamatha
  • N. K. Srinivasa RaoEmail author
  • R. H. Laxman
  • K. S. Shivashankara
  • R. M. Bhatt
  • K. C. Pavithra
Original Papers

Abstract

Tomato meets the dietary nutrient and antioxidant requirements of diverse populations. Being a C3 crop and an important vegetable, it is likely to be influenced by increased CO2 concentrations under climate change situation. This study was conducted to investigate the effects of elevated CO2 on overall physiology, water relations, growth, yield, and fruit quality of tomato (Lycopersicon esculentum Mill) cv. Arka Ashish. Plants were grown at elevated CO2 [550 (EC550) and 700 (EC700) ppm of CO2] in open top chambers. Increased assimilation rate, decreased stomatal conductance and transpiration rate were observed at elevated CO2 (EC) concentrations. Reduced leaf osmotic potential and increased water potential were observed at EC compared with the control (380 ppm of CO2) in flowering and fruiting stages. Lower total chlorophyll content was recorded at EC700. Plant height was significantly higher at EC550 compared with EC700. Higher number of branches was observed at EC700 as compared with plants grown at EC550 and the control. Leaf area was lower at EC700 compared with EC550 but specific leaf mass was higher at EC700. Due to higher leaf dry mass and root dry mass, the plants grown at EC700 exhibited higher total dry mass compared to EC550 and the control. Increased number of flowers and fruits together with higher fruit set led to higher fruit yield at both EC concentrations. The highest yield increase was observed at EC700. The fruits showed a lower content of phenols, flavonoids, ferric reducing antioxidant potential, total soluble solids, and titratable acidity in plants grown at EC as compared with the control. The ascorbic acid content was high at both EC700 and EC550. Carotenoids and lycopene content was low at EC700 compared to higher content observed at EC550 and the control.

Additional key words

gas exchange growth characteristics leaf water status pigments yield characteristics 

Abbreviations

CO2

carbon dioxide

E

transpiration

FFM

fruit fresh mass

FM

fresh mass

FRAP

ferric reducing antioxidant potential

gs

stomatal conductance

LDM

leaf dry mass

OTCs

open top chambers

PN

photosynthetic rate

RDM

root dry mass

SDM

stem dry mass

SLM

specific leaf mass

TDM

total dry mass

TSS

total soluble solids

WUE

water-use efficiency

Ψs

osmotic potential

Ψw

water potential

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Copyright information

© The Institute of Experimental Botany 2014

Authors and Affiliations

  • H. Mamatha
    • 1
  • N. K. Srinivasa Rao
    • 1
    Email author
  • R. H. Laxman
    • 1
  • K. S. Shivashankara
    • 1
  • R. M. Bhatt
    • 1
  • K. C. Pavithra
    • 1
  1. 1.Division of Plant Physiology and BiochemistryIndian Institute of Horticultural ResearchBangaloreIndia

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