Elevated CO2 and water deficit effects on photosynthesis, ribulose bisphosphate carboxylase-oxygenase, and carbohydrate metabolism in rice

被引:44
作者
Vu, JCV [1 ]
Baker, JT
Pennanen, AH
Allen, LH
Bowes, G
Boote, KJ
机构
[1] Univ Florida, USDA ARS, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Agron, Gainesville, FL 32611 USA
[3] Texas A&M Univ, Ctr Agr Res & Extens, Dept Hort, Overton, TX 75684 USA
[4] Univ Helsinki, Dept Plant Biol, FIN-00014 Helsinki, Finland
[5] Univ Florida, Dept Bot, Gainesville, FL 32611 USA
关键词
CO2; enrichment; drought; global climate change; Oryza sativa; photosynthesis; rice; Rubisco; SPS; starch; sucrose; water-use efficiency;
D O I
10.1034/j.1399-3054.1998.1030305.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Rice (Oryza sativa [L.] cv. IR-72) was grown for a season in sunlit, controlled-environment chambers at 350 or 700 mu mol CO2 mol(-1) under continuously flooded (unstressed) or drought-imposed periods at panicle initiation (stressed). The midday canopy photosynthetic rates (P-n), measured at the CO2 concentration ([CO2]) used for growth, were enhanced by high [CO2] but reduced by drought. High [CO2] increased P-n by 18 to 34% for the unstressed plants, and 6 to 12% for the stressed plants. In the unstressed plants, CO2 enrichment increased water-use efficiency (WUE) by 26%, and reduced evapotranspiration (ET) by 8 to 14%. Both high [CO2] and severe drought decreased the activity and content of ribulose bisphosphate carboxylase-oxygenase (Rubisco). High-CO2-unstressed plants had 6 to 22% smaller content and 5 to 25% lower activity of Rubisco than ambient-CO2-unstressed plants. Under severe drought, reductions of Rubisco were 53 and 27% in activity and 40 and 12% in content, respectively, for ambient- and high-CO2 treatments. The apparent catalytic turnover rate (K-cat) of midday fully activated Rubisco was not altered by high [CO2], but severe drought reduced K-cat by 17 to 23%. Chloroplasts of the high-CO2 leaves contained more, and larger starch grains than those of the ambient-CO2 leaves. High [CO2] did not affect the leaf sucrose content of unstressed plants. In contrast, severe drought reduced the leaf starch and increased the sucrose content in both CO2 treatments. The activity of leaf sucrose phosphate synthase of unstressed plants was not affected by high [CO2], whereas that of ambient-CO2-grown plants was reduced 45% by severe drought. Reduction in ET and enhancements in both P-n and WUE for rice grown under high [CO2] helped to delay the adverse effects of severe drought and allowed the stressed plants to assimilate CO2 for an extra day. Thus, rice grown in the next century may utilize less water, use water more efficiently, and be able to tolerate drought better under some situations.
引用
收藏
页码:327 / 339
页数:13
相关论文
共 46 条
[11]   WATER-STRESS, CO2 AND CLIMATE CHANGE [J].
CHAVES, MM ;
PEREIRA, JS .
JOURNAL OF EXPERIMENTAL BOTANY, 1992, 43 (253) :1131-1139
[12]   THE EFFECTS OF ELEVATED ATMOSPHERIC CARBON-DIOXIDE AND WATER-STRESS ON LIGHT INTERCEPTION, DRY-MATTER PRODUCTION AND YIELD IN STANDS OF GROUNDNUT (ARACHIS-HYPOGAEA L) [J].
CLIFFORD, SC ;
STRONACH, IM ;
MOHAMED, AD ;
AZAMALI, SN ;
CROUT, NMJ .
JOURNAL OF EXPERIMENTAL BOTANY, 1993, 44 (269) :1763-1770
[13]  
Cornic G., 1996, Photosynthesis and Environment, P347, DOI DOI 10.1007/0-306-48135-9_14
[14]   More efficient plants: A consequence of rising atmospheric CO2? [J].
Drake, BG ;
GonzalezMeler, MA ;
Long, SP .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1997, 48 :609-639
[15]   STOMATAL CONDUCTANCE AND PHOTOSYNTHESIS [J].
FARQUHAR, GD ;
SHARKEY, TD .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1982, 33 :317-345
[16]  
FOX TC, 1985, PLANT PHYSIOL, V80, P239
[17]   GLOBAL CLIMATE CHANGES AS FORECAST BY GODDARD INSTITUTE FOR SPACE STUDIES 3-DIMENSIONAL MODEL [J].
HANSEN, J ;
FUNG, I ;
LACIS, A ;
RIND, D ;
LEBEDEFF, S ;
RUEDY, R ;
RUSSELL, G ;
STONE, P .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1988, 93 (D8) :9341-9364
[18]   3 PHASES OF PLANT-RESPONSE TO ATMOSPHERIC CO2 ENRICHMENT [J].
IDSO, SB .
PLANT PHYSIOLOGY, 1988, 87 (01) :5-7
[19]  
International Rice Research Institute (IRRI), 1975, Major research in upland rice
[20]  
*IRRI, 1984, P 1982 BOUAK IV COAS