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Plant Architecture and Flag Leaf Morphology of Rice Crops Exposed to Experimental Warming with Elevated CO2
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  • Volume 56, Issue 3,  2011, pp.255-263
  • Publisher : The Korean Society of Crop Science
  • DOI : 10.7740/kjcs.2011.56.3.255
 Title & Authors
Plant Architecture and Flag Leaf Morphology of Rice Crops Exposed to Experimental Warming with Elevated CO2
Vu, Thang; Kim, Han-Yong;
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Projected increases in atmospheric concentration ([]) and temperature () have the potential to alter in rice growth and yield. However, little is known about whether warming with elevated [] modify plant architecture. To better understand the vertical profiles of leaf area index (LAI) and the flag leaf morphology of rice grown under elevated and [], we conducted a temperature gradient field chamber (TGC) experiment at Gwangju, Korea. Rice (Oryza sativa L. cv. Dongjin1ho) was grown at two [] [386 (ambient) vs 592 ppmV (elevated)] and three regimes [26.8 (ambient), 28.1 and ] in six independent field TGCs. While elevated did not alter total LAI, elevated [] tended to reduce (c. 6.6%) the LAI. At a given canopy layer, the LAI was affected neither by elevated [] nor by elevated , allocating the largest LAI in the middle part of the canopy. However, the fraction of LAI distributed in a higher and in a lower layer was strongly affected by elevated ; on average, the LAI distributed in the 75-90 cm (and 45-60 cm) layer of total LAI was 9.4% (and 35.0%), 18.8% (25.9%) and 18.6% (29.2%) in ambient , and above ambient , respectively. Most of the parameters related to flag leaf morphology was negated with elevated []; there were about 12%, 5%, 7.5%, 15% and 21% decreases in length (L), width (W), L:W ratio, area and mass of the flag leaf, respectively, at elevated []. However, the negative effect of elevated [] was offset to some extent by warming. All modifications observed were directly or indirectly associated with either stimulated leaf expansion or crop phenology under warming with elevated []. We conclude that plant architecture and flag leaf morphology of rice can be modified both by warming and elevated [] via altering crop phenology and the extent of leaf expansion.
plant architecture;leaf morphology;elevated ;global warming;rice;
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