Changes in Photosystem II Activity and Leaf Reflectance Features of Several Subtropical Woody Plants Under Simulated SO2Treatment

Extreme weather events with high temperatures and strong sunlight have increased alarmingly in the last few decades, considerable affecting plant photosynthesis. In this study, the impact of thermal stress on photosystem II activity in the leaves of pedunculate oak trees (Quercus robur L.) of different ecological origin was assessed. Four days after the thermal shock application with a temperature of 50°C during 20, 40, 60 minutes, the processes of recovery on photosystem II activity in the leaves of the oak trees in the investigated provenances took place with different speed and fullness. The recovery of the functional state of photosystem II in the leaves of the trees showed that in the environmental conditions of the ,,Plaiul Fagului” reservation territory an advanced thermotolerance to the thermal stress action was specifi c for the origin from the north of the country (Edinet). The leaves of the trees of local and southern origin showed a low resistance to the thermal stress action. The advanced adaptation capacity, the high growth rate of the trees from the northern provenance suggest that the acorn harvested from the oaks of northern origin can be used for the works of extension of the afforestation areas in the central area of the Republic of Moldova.

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Isolation and Characterization of a Type I Gene Encoding a Light-harvesting Chlorophyll a/b-binding Protein of Photosystem II in Peach

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.123.4.493 ◽

1998 ◽

Vol 123 (4) ◽

pp. 493-499 ◽

Cited By ~ 1

Author(s):

Kyu H. Chung ◽

Dennis E. Buetow ◽

Schuyler S. Korban

Keyword(s):

Amino Acids ◽

Amino Acid ◽

Photosystem Ii ◽

Amino Acid Sequence ◽

Woody Plants ◽

Light Harvesting ◽

Binding Protein ◽

Transit Peptide ◽

Type I ◽

Polyadenylation Sites

A nuclear gene, Lhcb1*Pp1, encoding a light-harvesting chlorophyll a/b-binding protein of photosystem II has been isolated from peach [Prunus persica (L.) Batsch. `Stark Earliglo'] leaf genomic DNA, cloned, and sequenced. This gene encodes a precursor polypeptide of 267 amino acids with a transit peptide of 34 and a type I mature protein of 233 amino acids. The amino acid sequence of the mature polypeptide is 89% to 94% and 80% to 94% similar to those encoded by type I Lhcb genes of annual and other woody plants, respectively. In contrast, the amino acid sequence of the peach transit peptide is less conserved being 47% to 69% similar to those of annual plants and only 17% to 22% similar to those of other woody plants. The peach gene was used as a probe for Lhcb gene expression. Lhcb mRNA is detected in leaves of field-grown trees during June to October. Lhcb mRNA is detected at a high level in leaves of peach shoots grown in tissue culture in the light, but only at a trace level in leaves grown in the dark. Some Lhcb genes appear to be light-modulated in stems. Lhcb1*Ppl contains four potential polyadenylation sites. S1 nuclease analysis detected transcripts of the sizes expected from each of the four polyadenylation sites. All four are found in leaves of light-grown shoots and of field-grown trees throughout the growing season. In contrast, only three are detected in stems of light-grown shoots.

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Flower Induction in Seedlings of Asparagus officinalis L. by N-Phenylcarbamates

Zeitschrift für Naturforschung C ◽

10.1515/znc-1989-3-409 ◽

1989 ◽

Vol 44 (3-4) ◽

pp. 226-232 ◽

Cited By ~ 2

Author(s):

Keiko Yanosaka ◽

Hajime Iwamura ◽

Toshio Fujita

Keyword(s):

Photosystem Ii ◽

Seedling Stage ◽

Flower Induction ◽

Asparagus Officinalis ◽

Dioecious Plant ◽

Male And Female ◽

Flowering Induction ◽

Cross Breeding ◽

Photosystem Ii Activity ◽

Female Flowers

Abstract A series of N-phenylcarbamates induced flowers in one-month-old seedlings of Asparagus officinalis L. Ninety to 100% of the plants flowered when the seeds were germinated in the presence of the most potent members of this class. The flowering occurred only once at the top of the seedlings, which then continued to grow normally. This made it possible to select the commercially preferred m ales of this dioecious plant at the seedling stage. Both male and female flowers were fertile, so cross-breeding was possible between flowering seedlings as well as between flowering seedlings and adults that had grown normally. Activity of flowering induction was not related with inhibition of photosystem II activity.

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Expected and Unexpected Effects of Mutations Conferring Herbicide Resistance on Photosystem II Activity in Synechocystis PCC 6714 and 6803

Research in Photosynthesis ◽

10.1007/978-94-009-0383-8_126 ◽

1992 ◽

pp. 575-578

Author(s):

C. Astier ◽

G. Ajlani ◽

I. Perewoska ◽

M. Picaud ◽

C. Vernotte

Keyword(s):

Photosystem Ii ◽

Herbicide Resistance ◽

Photosystem Ii Activity ◽

Synechocystis Pcc 6714

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Photosystem‐II Activity Is Decreased by Yellowing of Barley Primary Leaves during Growth in Elevated Carbon Dioxide

International Journal of Plant Sciences ◽

10.1086/314182 ◽

1999 ◽

Vol 160 (5) ◽

pp. 849-854 ◽

Cited By ~ 7

Author(s):

Richard C. Sicher

Keyword(s):

Carbon Dioxide ◽

Photosystem Ii ◽

Elevated Carbon Dioxide ◽

Photosystem Ii Activity

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The Use of O2-Evolving Subchloroplast Particles to Study Acceptor and Inhibitor Sites on the Reducing Side of Photosystem II

Zeitschrift für Naturforschung C ◽

10.1515/znc-1983-9-1020 ◽

1983 ◽

Vol 38 (9-10) ◽

pp. 793-798 ◽

Cited By ~ 4

Author(s):

W. S. Cohen ◽

J. R. Barton

Keyword(s):

Electron Transfer ◽

Electron Transport ◽

Photosystem Ii ◽

Differential Sensitivity ◽

Electron Transfer Chain ◽

Plastoquinone Pool ◽

Photosystem Ii Activity ◽

Transfer Chain ◽

Photosynthetic Electron Transfer ◽

Photosystem Ii Particles

Photosystem II particles that retain the ability to evolve O2 have been used to examine acceptor and inhibitor sites in the photosynthetic electron transfer chain between Q and plastoquinone. Employing the water to dichlorobenzoquinone reaction to assay photosystem II activity, we have demonstrated that electron transport in thylakoids and particles is equally sensitive to inhibition by DCMU. dinoseb, metribuzin, HQNO and DBMIB. Based on differential sensitivity to inhibition by DCMU vs. HQNO or DBMIB, we suggest that when synthetic quinones, e.g. 2,6-dichlorobenzoquinone operate as Hill reagents in particles they are reduced primarily by the plastoquinone pool. When synthetic quinones, e.g. 5,6-methylenedioxy-2,3-dimethyl benzoquinone act as autoxidizable acceptors they accept electron from the Q/B complex at a point that is located between the DCMU and HQNO (DBMIB) inhibition sites.

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