Photosystem II chlorophyll a fluorescence lifetimes and intensity are independent of the antenna size differences between barley wild-type and chlorina mutants: Photochemical quenching and xanthophyll cycle-dependent nonphotochemical quenching of fluorescence

1996 ◽  
Vol 48 (1-2) ◽  
pp. 171-187 ◽  
Author(s):  
Adam M. Gilmore ◽  
Theodore L. Hazlett ◽  
Peter G. Debrunner ◽  
Govindjee
Keyword(s):  
Photosystem Ii ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Xanthophyll Cycle ◽  
Nonphotochemical Quenching ◽  
Photochemical Quenching ◽  
Fluorescence Lifetimes ◽  
Wild Type ◽  
Antenna Size ◽  
Cycle Dependent

Photoprotective mechanisms during leaf ontogeny: cuticular development and anthocyanin deposition in two morphs of Agave striata that differ in leaf coloration

Botany ◽  
2009 ◽  
Vol 87 (12) ◽  
pp. 1186-1197 ◽  
Author(s):  
Nicolas Y. Fondom ◽  
Sergio Castro-Nava ◽  
Alfredo J. Huerta
Keyword(s):  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Xanthophyll Cycle ◽  
Photochemical Quenching ◽  
Delayed Response ◽  
Anthocyanin Content ◽  
Leaf Ontogeny ◽  
Leaf Coloration ◽  
Young Leaves ◽  
Non Photochemical Quenching

Our objectives were to test whether in Agave striata Zucc., a plant with crassulacean acid metabolism (CAM plant), leaf wax development is a delayed response to sunlight exposure following cutin development, and whether energy dissipation shifts from non-photochemical quenching to photochemical quenching during leaf ontogeny. Under field conditions, photosynthesis, cuticular development, and anthocyanin deposition were studied in two morphs of A. striata that differ in leaf coloration (green vs. red). We quantified leaf anthocyanin, wax, and cutin content, and also measured chlorophyll a fluorescence and leaf surface temperature. In addition, using three leaf reflectance indices, we measured relative chlorophyll and anthocyanin content, and also xanthophyll-cycle de-epoxidation state (xanthophyll conversion). Our results revealed that the main components of cuticle (wax and cutin) in leaves of A. striata are deposited during different developmental windows, which are similar to leaves of monocots such as grasses. Exposure to sunlight was found to be the most likely candidate to affect wax and anthocyanin deposition. Chlorophyll a fluorescence data revealed that the sunlight conditions experienced by both morphs predisposed the young leaves of the green morph and old leaves of both morphs to photoinhibition. Our results also revealed that old leaves of the red morph, which contain a reduced level of chlorophyll and anthocyanin, had additional photoprotection via xanthophyll conversion. The results presented here support the photoprotective function of leaf anthocyanins and wax accumulation during leaf ontogeny, indicating that their presence may compensate for the reduced dependence of non-photochemical quenching and the xanthophyll-cycle pigment conversion.

scholarly journals Photosynthetic Potential and Productivity of Common Beans under Herbicide Effect

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
G.R. LIMA ◽  
D.C. MACEDO ◽  
R.L.N. BARROS ◽  
A.F.L. MACHADO ◽  
C. PIMENTEL
Keyword(s):  
Quantum Yield ◽  
Photosystem Ii ◽  
Common Bean ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Environmental Influence ◽  
Photochemical Quenching ◽  
Effective Quantum Yield ◽  
Herbicide Application ◽  
Fluorescence Parameters

ABSTRACT: The objective of this study was to evaluate the effects of the application of contact herbicides recommended for common bean crops, as for chlorophyll a fluorescence parameters, leaf soluble proteins content (LSPC) and productivity. The experiment was conducted on the field with five treatments, which were the application of the following herbicides: bentazon (720 g ha-1), fluazifop-p-butil (187.5 g ha-1), fomesafen (250 g ha-1) fluazifop-p-butil + fomesafen (187.5 + 250 g ha-1), and a manually weeded control treatment without herbicide application, in a randomized block design with four replications. Bentazon was the only herbicide causing significant reductions, but only until the first day after herbicide application (DAA), on the following chlorophyll a fluorescence parameters: maximum quantum yield of photosystem II (Fv/Fm), effective quantum yield of photosystem II (ϕPSII), photochemical quenching (qP); it also induced an increase in non-photochemical quenching (NPQ). Fv/Fm was the best parameter to indicate herbicide effect on the photosynthetic apparatus of plants in the field. Chlorophyll a fluorescence parameters obtained in light-adapted leaves underwent a high environmental influence, especially deriving from the variation in the photosynthetic photon flow density (PPFD) during measurements; they are not recommended to evaluate the effects of herbicides on the field. None of the applied herbicides evaluated caused reductions in grain yield; therefore, they are recommended for common bean crops.

Variation among slash pine families in chlorophyll fluorescence traits

2003 ◽  
Vol 33 (6) ◽  
pp. 1102-1109 ◽  
Author(s):  
Anita C Koehn ◽  
James H Roberds ◽  
Robert L Doudrick
Keyword(s):  
Photosystem Ii ◽  
Growth Traits ◽  
Pinus Elliottii ◽  
Nonphotochemical Quenching ◽  
Slash Pine ◽  
Photochemical Quenching ◽  
Full Sibling ◽  
Pretreatment Effects ◽  
Pattern Of Variation ◽  
Variance Profile

Photochemical quenching, nonphotochemical quenching, and yield of photosystem II were measured on seedlings of full-sibling, open-, and self-pollinated slash pine (Pinus elliottii Engelm. var. elliottii) families. Our results reveal that genetic variation in photochemical quenching and yield of photosystem II exists within this species. The pattern of variation found in these traits is consistent with the variance profile expected to occur as a result of segregation among nuclear genes. Variation among families accounted for 17% of the total variation observed in photochemical quenching, whereas the component for trees within families made up slightly more than 25% of the total. Less variation, both among families as well as among trees within families, was found for yield of photosystem II. A strikingly different pattern was observed for nonphotochemical quenching. Other than the error term, only pretreatment effects contributed significantly to the variation observed. This suggests that nonphotochemical quenching is largely influenced by environmental factors. With regard to associations between fluorescence and growth traits, both height and diameter growth were found to be positively correlated with photochemical quenching (0.36 and 0.33, respectively) when selfed and open-pollinated families were analyzed along with control-pollinated families.

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