Responses of Two CAM Species to Different Irradiances during Growth and Susceptibility to Photoinhibition by High Light

Adams, William W.; Osmond, C. B.; Sharkey, Thomas D.

doi:10.1104/pp.83.1.213

Cited by 55 publications

(30 citation statements)

References 13 publications

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“…In agreement with the findings of Greer et al (18), but in contrast to the reports of other workers (1,8,9,11,12), we obtained a curvilinear relationship between Fv/FM and 'A (Fig. 1C).…”

Section: Plantsupporting

confidence: 93%

“…Models for energy distribution in the photochemical apparatus (10,19) have led to the prediction of a linear relationship between Fv/FM (near 690 nm) and bA (8). The results of several investigators have supported this prediction (1,8,9,11,12). However, in studies of Actinidia deliciosa, Greer et al (18) found that this relationship was curvilinear and concluded that Fv, which was linearly related to OA, provided a better estimate of the inhibitory effects of high PFD on PSII photochemistry.…”

mentioning

confidence: 84%

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Photoinhibition in Vitis californica

Gamon¹,

Pearcy²

1990

Plant Physiol.

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“…In agreement with the findings of Greer et al (18), but in contrast to the reports of other workers (1,8,9,11,12), we obtained a curvilinear relationship between Fv/FM and 'A (Fig. 1C).…”

Section: Plantsupporting

confidence: 93%

mentioning

confidence: 84%

Photoinhibition in Vitis californica

Gamon¹,

Pearcy²

1990

Plant Physiol.

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“…Perhaps the least equivocal indicator of PSII photochemical status is induction of chlorophyll fluorescence at 690 nm and 77 K. In particular, the ratio of variable to maximum fluorescence (Fv/Fm) following dark adaptation is correlated with quantum yield (~0), at least following short-term exposure of shade-grown plants to high PFD (Adams et al 1987a;Bj6rkman 1987;Bj6rkman and Demmig 1987;Demmig and Bjtrkman 1987). The ratio Fv/Fm can also be determined at room temperature using pulse-amplitude modulation techniques (Schreiber et al 1986).…”

Section: Introductionmentioning

confidence: 97%

Photoacclimation and photoinhibition in Ulva rotundata as influenced by nitrogen availability

Henley

Levavasseur

Franklin

et al. 1991

Planta

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Clonal tissue of the marine chlorophyte macroalga, Ulva rotundata Blid., was transferred from 100 to 1700 μmol photons · m(-2) · s(-1) under limiting (1.5 μM NH 4 (+) maximum, N/P=2) and sufficient (15 μM NH 4 (+) maximum, N/P=20) nitrogen supply at 18° C and 11 h light-13 h darkness daily. Photoinhibition was assayed by light-response curves (photosynthetic O2 exchange), and chlorophyll fluorescence at 77 K and room temperature. Daily surface-area growth rate (μSA) in N-sufficient plants increased sixfold over 3 d and was sustained at that level. During this period, respiration (R d) doubled and light-saturated net photosynthesis capacity (P m) increased by nearly 50%, indicating acclimation to high light. Quantum yield (ϕ) decreased by 25% on the first day, but recovered completely within one week. The ratio of variable to maximum fluorescence (F v/F m) also decreased markedly on the first day, because of an increase in initial fluorescence (F o) and a decrease in F m, and partially recovered over several days. Under the added stress of N deficiency, μSA accelerated fivefold over 4 d, despite chronic photoinhibition, then declined along with tissue-N. Respiration doubled, but P m decreased by 50% over one week, indicating inability to acclimate to high light. Both ϕ and F v/F m decreased markedly on the first day and did not significantly recover. Changes in F o, F m and xanthophyll-cycle components indicate concurrent photodamage to photosystem II (PSII) and photoprotection by thermal deexcitation in the antenna pigments. Increasing μSA coincided with photoinhibition of PSII. Insufficient diel-carbon balance because of elevated R d and declining P m and tissue-N, rather than photochemical damage per se, was the apparent proximate cause of decelerating growth rate and subsequent tissue degeneration under N deficiency in U. rotundata.

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“…occur in both shaded and exposed natural habitats (21), and some species such as Kalanchooe daigremontiana have a large acclimation potential with respect to growth PFD2 (1). In a recent study (18), a marked gradation in the degree of CAM was observed within the chlorenchyma of the amphistomatic leaves of K. daigremontiana.…”

mentioning

confidence: 99%

“…Light was provided by metal halide lamps (HRI-T 1000 W/D; Radium Elektrizitiits-Ges., Wipperfurth, F.R.G.). Infrared radiation was reduced using 3 mm thick 1 PFDs by varying the distance between lamps and plants and by insertion of brass screens to which a coating of carbon had been applied with a candle.…”

Section: Plant Materialsmentioning

confidence: 99%

Crassulacean Acid Metabolism and Photochemical Efficiency of Photosystem II in the Adaxial and Abaxial Parts of the Succulent Leaves of Kalanchoë daigremontiana Grown at Four Photon Flux Densities

Winter¹,

Awender²

1989

Plant Physiol.

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Kalanchod daigremontiana, a species possessing crassulacean acid metabolism, was grown at four photon flux densities (1300, 400, 60, and 25 micromole photons per square meter per second). In leaves which had developed at 1300 and 400 micromole photons per square meter per second, CO2 was mainly incorporated through the lower, shaded leaf surfaces, and the chlorenchyma adjacent to the lower surfaces showed a higher degree of nocturnal acid synthesis than the chlorenchyma adjacent to the upper surfaces. In leaves acclimated to 60 and 25 micromole photons per square meter per second, the gradient in CAM activity was reversed, i.e. more CO2 was taken up through the upper than through the lower surfaces and noctumal acidification was higher in the tissue next to the upper surfaces. Total net carbon gain and total noctumal acid synthesis were highest in leaves which had developed at 400 micromole photons per square meter per second. Chlorophyll content was markedly reduced in leaves which had developed at 1300 micromole photons per square meter per second, especially in the exposed adaxial parts. There was also a sustained reduction in photosystem 11 photochemical efficiency as indicated by measurements of the ratio of variable over maximum chlorophyll a fluorescence. These findings suggest that, at high growth photon flux densities, the reduced activity of the exposed portions of these succulent leaves is caused by (a) the adverse effects of excess light, (b) together with a genotypic component which favors CO2 uptake and acid synthesis in the abaxial (lower) leaf parts even when light is not or only marginally excessive. This latter component is predominant at medium photon flux densities, e.g. at 400 micromole photons per square meter per second. It becomes overridden, however, under conditions of deep shade when strongly reduced light levels in the abaxial parts of the leaf chlorenchyma severely limit photosynthesis.

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Responses of Two CAM Species to Different Irradiances during Growth and Susceptibility to Photoinhibition by High Light

Cited by 55 publications

References 13 publications

Photoinhibition in Vitis californica

Photoinhibition in Vitis californica

Photoacclimation and photoinhibition in Ulva rotundata as influenced by nitrogen availability

Crassulacean Acid Metabolism and Photochemical Efficiency of Photosystem II in the Adaxial and Abaxial Parts of the Succulent Leaves of Kalanchoë daigremontiana Grown at Four Photon Flux Densities

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