Daily photosynthetic and C-export patterns in winter wheat leaves during cold stress and acclimation

被引:43
作者
Leonardos, ED
Savitch, LV
Huner, NPA
Öquist, G
Grodzinski, B [1 ]
机构
[1] Univ Guelph, Dept Plant Agr, Div Hort Sci, Guelph, ON N1G 2W1, Canada
[2] Agr & Agri Food Canada, Eastern Cereal & Oilseed Ctr, Ottawa, ON K1A 0C6, Canada
[3] Univ Western Ontario, Dept Plant Sci, London, ON N6A 5B7, Canada
[4] Umea Univ, Dept Plant Physiol, Umea Plant Sci Ctr, S-90187 Umea, Sweden
关键词
D O I
10.1034/j.1399-3054.2003.00057.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Diurnal patterns of whole-plant and leaf gas exchange and (14) C-export of winter wheat acclimated at 20 and 5degreesC were determined. The 5degreesC-acclimated plants had lower relative growth rates, smaller biomass and leaf area, but larger specific leaf weight than 20degreesC plants. Photosynthetic rates in 20degreesC and 5degreesC-acclimated leaves were similar; however, daytime export from 5degreesC-acclimated leaves was 45% lower. Photosynthesis and export remained steady in 20degreesC and 5degreesC-acclimated leaves during the daytime. By comparison, photosynthesis in 5degreesC-stressed leaves (20degreesC-acclimated plants exposed to 5degreesC 12 h before and during measurements) declined from 70 to 50% of the 20degreesC-acclimated leaves during the daytime, while export remained constant at 35% of the 20degreesC-acclimated and 60% of the 5degreesC-acclimated leaves. At high light and CO2 , photosynthesis and export increased in both 20degreesC and 5degreesC-acclimated leaves, but rates in 5degreesC-stressed leaves remained unchanged. At all conditions daytime export was greater than nighttime export. Taken together, during cold acclimation photosynthesis was upregulated, whereas export was only partially increased. We suggest that this reflects a requirement of cold-acclimated plants to both sustain an increased leaf metabolic demand while concomitantly supporting translocation of photoassimilates to overwintering sinks.
引用
收藏
页码:521 / 531
页数:11
相关论文
共 59 条
[11]   METHOD FOR CONTINUOUS MEASUREMENT OF EXPORT FROM A LEAF [J].
GEIGER, DR ;
FONDY, BR .
PLANT PHYSIOLOGY, 1979, 64 (03) :361-365
[12]   PHLOEM LOADING OF SUCROSE [J].
GIAQUINTA, RT .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1983, 34 :347-387
[13]  
Gordon A.J., 1986, PHLOEM TRANSPORT, V1, P499
[14]   Photosystem II excitation pressure and development of resistance to photoinhibition .2. Adjustment of photosynthetic capacity in winter wheat and winter rye [J].
Gray, GR ;
Savitch, LV ;
Ivanov, AC ;
Huner, NPA .
PLANT PHYSIOLOGY, 1996, 110 (01) :61-71
[15]   Assimilate export by leaves of Ricinus communis L. growing under normal and elevated carbon dioxide concentrations:: the same rate during the day, a different rate at night [J].
Grimmer, C ;
Komor, E .
PLANTA, 1999, 209 (03) :275-281
[16]   Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase [J].
Grodzinski, B ;
Jiao, J ;
Knowles, VL ;
Plaxton, WC .
PLANT PHYSIOLOGY, 1999, 120 (03) :887-895
[17]   Estimating photosynthesis and concurrent export rates in C3 and C4 species at ambient and elevated CO2 [J].
Grodzinski, B ;
Jiao, JR ;
Leonardos, ED .
PLANT PHYSIOLOGY, 1998, 117 (01) :207-215
[18]  
GRODZINSKI B, 2001, P 12 INT C PHOT PS20
[19]   CHANGES IN ACTIVITIES OF ENZYMES OF CARBON METABOLISM IN LEAVES DURING EXPOSURE OF PLANTS TO LOW-TEMPERATURE [J].
HOLADAY, AS ;
MARTINDALE, W ;
ALRED, R ;
BROOKS, AL ;
LEEGOOD, RC .
PLANT PHYSIOLOGY, 1992, 98 (03) :1105-1114
[20]   ANATOMICAL CHANGES IN LEAVES OF PUMA RYE IN RESPONSE TO GROWTH AT COLD-HARDENING TEMPERATURES [J].
HUNER, NPA ;
PALTA, JP ;
LI, PH ;
CARTER, JV .
BOTANICAL GAZETTE, 1981, 142 (01) :55-62