Light Adaptation in Tomato Leaves

Withers, A. C.; Besford, R. T.; Chow, W. S.; Ludwig, L. J.

doi:10.1007/978-94-017-4971-8_65

Cited by 8 publications

(2 citation statements)

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“…In assessing the acclimation responses of the photosynthetic system to increased irradiance we used the photosynthetic capacity (P,,,) as the primary indicator. P, , , is an indication of the overall response of the photosynthetic system and has previously been found to be suitably responsive to irradiance changes in tomato (Withers et al, 1984). Dark respiration and total chlorophyll also increased in response to increased irradiance and usually, although not always, reflected the same pattern of changes.…”

Section: Discussionmentioning

confidence: 92%

“…Acclimation to increased irradiance can occur rapidly. When tomato plants were transferred from low (20 W mP2) to high (80 W m-') irradiance from cool white fluorescent lamps (CWF) § at the 5th leaf stage the light-saturated rate of photosynthesis (PmaX) increased within 1 day and doubled within 7 days (Withers et al, 1984). This was accompanied by an increase in the activity of several Calvin cycle enzymes and a rapid increase in ATPase activity and dark respiration (Ludwig et al, 1975;Besford, 1986;Davies et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Identity of the Photoreceptors for the Perception of Irradiance in Photosynthetic Light Acclimation in Tomato*

Withers¹,

Vince‐Prue²,

Thomas³

1991

Photochem & Photobiology

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The photoreceptors involved in the photosynthetic acclimation of tomato (Lycopersicon esculentum Mill.) to increased irradiance were investigated. Plants were transferred from 100 pmol r r Z s-' cool white fluorescent light to higher irradiances of white light or white light supplemented with blue, red, green or yellow light. In these experiements light of all wavelengths tested was capable of causing acclimation as measured by the rate of light-saturated photosynthesis. It was concluded that the photosynthetic system rather than the blue-absorbing photoreceptor or phytochrome system acts as the photoreceptor for increased irradiance. No acclimation was observed in response to increased CO, levels, but increasing light integral at a constant irradiance was effective in bringing about acclimation. We conclude that acclimation is a response to increased photosynthetic light capture rather than increased photosynthetic carbon fixation, and involves a photon counting mechanism

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Section: Discussionmentioning

confidence: 92%