Effects of Ethylene on Photosynthesis and Partitioning in Tomato,<i>Lycopersicon esculentum</i>Mill

Woodrow, Lorna; Thompson, R. W.; Grodzinski, Bernard

doi:10.1093/jxb/39.6.667

Cited by 47 publications

(42 citation statements)

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“…Steady-state gas-exchange measurements were conducted on attached intact leaves using an open-flow system similar to that described previously (Woodrow et al, 1988). The leaf cuvette, which was made from brass and chromeplated to reduce problems associated with water absorption (Dixon and Grace, 1982;Jiao et al, 1996), consisted of an upper section with a glass window and a lower section, in which was mounted a GM detector (model EWGM, window area 6.8 cm, Bicron Corp., Newbury, OH).…”

Section: Net Co Fixationmentioning

confidence: 99%

The Effect of Leaf Temperature and Photorespiratory Conditions on Export of Sugars during Steady-State Photosynthesis in Salvia splendens

Jiao

Grodzinski

1996

Plant Physiology

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Export and photosynthesis i n leaves of Salvia splendens were measured concurrently during steady-state 14C0, labeling conditions. Under ambient CO, and O, conditions, photosynthesis and export rates were similar at 15 and 25"C, but both declined as leaf temperature was raised from 25 to 40°C. Suppressing photorespiration between 15 and 40°C by manipulating CO, and O, levels resulted in higher rates of leaf photosynthesis, total sugar synthesis, and export. There was a linear relationship between the rate of photosynthesis and the rate of export between 15 and 35°C. At these temperatures, 60 to 80% of the carbon fixed was readily exported with sucrose, raffinose, and stachyose, which together constituted over 90% of phloem mobile assimilates. Above 35"C, however, export during photosynthesis was inhibited both in photorespiratory conditions, which inhibited photosynthesis, and in nonphotorespiratory conditions, which did not inhibit photosynthesis. Sucrose and raffinose but not stachyose accumulated i n the leaf at 40°C. When leaves were preincubated at 40°C and then cooled to 3 5 T , export recovered more slowly than photosynthesis. These data are consistent with the view that impairment of export processes, rather than photosynthetic processes associated with light trapping, carbon reduction, and sucrose synthesis, accounted for the marked reduction i n export between 35 and 40°C. Taken together, the data indicated that temperature changes between 15 and 40°C had two effects on photosynthesis and concurrent export. At all temperatures, suppressing photorespiration increased both photosynthesis and export, but above 35"C, export processes were more directly inhibited independent of changes i n photorespiration and photosynthesis.

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Section: Net Co Fixationmentioning

confidence: 99%

The Effect of Leaf Temperature and Photorespiratory Conditions on Export of Sugars during Steady-State Photosynthesis in Salvia splendens

Jiao

Grodzinski

1996

Plant Physiology

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“…3). Steady-state gas exchange measurements were conducted on an attached, intact, tendril complex using an open flow system as described previously (8,30). Gas exchange was measured before and during the application of fluorescein (see below).…”

Section: Plant Materials and Gas Exchangementioning

confidence: 99%

“…ambient air) for 60 min in a manner similar to that described in Woodrow et al (30). During the entire experiment, transpiration and photosynthesis at 350 Pa CO2 and 250C were monitored.…”

Section: Distribution Of "4c-photoassimilatesmentioning

confidence: 99%

“…First, disodium fluorescein dye was applied to an abraded petiole surface at various developmental stages of the tendrils, and its direction of movement was recorded (1,22). Second, the long-lived radioisotope of carbon, 14C, was used to determine whether the tendrils were importing or exporting newly fixed carbon (4,14,30). Third, the translocation profiles of "C-photoassimilates (6,30) exported from the same complex were studied as it developed from stage I to stage III.…”

mentioning

confidence: 99%

“…Second, the long-lived radioisotope of carbon, 14C, was used to determine whether the tendrils were importing or exporting newly fixed carbon (4,14,30). Third, the translocation profiles of "C-photoassimilates (6,30) exported from the same complex were studied as it developed from stage I to stage III. Finally, the effects of anoxic conditions, a reversible cold block, and heat girdling on the translocation of assimilates from tendril complexes were determined (6).…”

mentioning

confidence: 99%

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