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plastoquinone/zea mays
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13 risultati
Cyclic electron flow around PSI monitored by afterglow luminescence in leaves of maize inbred lines (Zea mays L.): correlation with chilling tolerance.
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Maize (Zea mays L.) inbred lines of contrasting chilling sensitivity (three tolerant, three sensitive lines) were acclimated to 280 mumol photons m(-2) s(-1) white light at a 17 degrees C sub-optimal temperature. They showed no symptoms of photoinhibition, despite slight changes in photosystem II
Biosynthesis of phytoquinones. Biosynthetic origins of the nuclei and satellite methyl groups of plastoquinone, tocopherols and tocopherolquinones in maize shoots, bean shoots and ivy leaves.
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1. By using dl-[ring-(14)C]phenylalanine, dl-[beta-(14)C]phenylalanine, dl-[alpha-(14)C]-tyrosine and dl-[beta-(14)C]tyrosine it was shown that in maize shoots (Zea mays) the nucleus and one nuclear methyl group of each of the following compounds, plastoquinone, gamma-tocopherol (aromatic nucleus)
[The dependence of the concentration of plastid quinones and pigments in Zea mays and Atriplex rosea on the light intensity and the age of the plants].
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The concentration of lipophilic plastid quinones (plastoquinone, plastoquinol, α-tocopherol, α-tocoquinone) in the C4-plants Zea mays and Atriplex rosea is lower than in the already studied C3-plants.In Zea mays the concentration of plastid quinones increases only a little with the age of the plant
Evidence for a Role for NAD(P)H Dehydrogenase in Concentration of CO2 in the Bundle Sheath Cell of Zea mays.
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Prior studies with Nicotiana and Arabidopsis described failed assembly of the chloroplastic NDH [NAD(P)H dehydrogenase] supercomplex by serial mutation of several subunit genes. We examined the properties of Zea mays leaves containing Mu and Ds insertions into nuclear gene exons encoding the
Studies of the Ndh complex and photosystem II from mesophyll and bundle sheath chloroplasts of the C4-type plant Zea mays.
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In C(4) plants, granal mesophyll (MS) chloroplasts contain higher photosystem (PS) II and lower PS I activity than agranal bundle sheath (BS) chloroplasts. The maize NAD(P)H dehydrogenase or NAD(P)H-plastoquinone oxidoreductase (also named Ndh complex) from MS and BS chloroplasts, contains at least
Cytokinin-induced photosynthetic adaptability of Zea mays L. to drought stress associated with nitric oxide signal: probed by ESR spectroscopy and fast OJIP fluorescence rise.
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Nitric oxide (NO), as a diffusible molecule, performs important roles in diverse physiological processes. Interestingly, NO signaling is based on interactions with plant hormones. The aim of this study was, first, to test the effect of cytokinin (CTK) on the primary reaction of photosynthesis under
The involvement of the photoinhibition of photosystem II and impaired membrane energization in the reduced quantum yield of carbon assimilation in chilled maize.
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In this study we investigated the basis for the reduction in the quantum yield of carbon assimilation in maize (Zea mays L. cv. LG11) caused by chilling in high light. After chilling attached maize leaves at 5° C for 6 h at high irradiance (1000 μmol photons·m(-2)·s(-1)) chlorophyll fluorescence
Analysis of donors of electrons to photosystem I and cyclic electron flow by redox kinetics of P700 in chloroplasts of isolated bundle sheath strands of maize.
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Bundle sheath chloroplasts of NADP-malic enzyme (NADP-ME) type C4 species have a high demand for ATP, while being deficient in linear electron flow and oxidation of water by photosystem II (PSII). To evaluate electron donors to photosystem I (PSI) and possible pathways of cyclic electron flow (CEF1)
Compensatory Alterations in the Photochemical Apparatus of a Photoregulatory, Chlorophyll b-Deficient Mutant of Maize.
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Characterization of the functional organization of the photochemical apparatus in the light sensitive chlorophyll b-deficient oil yellow-yellow green (OY-YG) mutant of maize (Zea mays) is presented. Spectrophotometric and kinetic analysis revealed substantially lower amounts of the light harvesting
Mesotrione: a new selective herbicide for use in maize.
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Mesotrione is a new herbicide being developed for the selective pre- and post-emergence control of a wide range of broad-leaved and grass weeds in maize (Zea mays). It is a member of the benzoylcyclohexane-1,3-dione family of herbicides, which are chemically derived from a natural phytotoxin
The photosystem II subunit CP29 can be phosphorylated in both C3 and C4 plants as suggested by sequence analysis.
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The CP29 subunit of Photosystem II is reversibly phosphorylated in Zea mays upon exposure to high light in the cold (Bergantino et al., J Biol Chem 270 (1995) 8474-8481). This phenomenon was previously proposed to be restricted to C4 plants. We present the complete sequence of the CP29 protein,
Free energy calculations elucidate substrate binding, gating mechanism, and tolerance-promoting mutations in herbicide target 4-hydroxyphenylpyruvate dioxygenase.
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4-Hydroxyphenylpyruvate dioxygenase (HPPD) catalyzes the second reaction in the tyrosine catabolism and is linked to the production of cofactors plastoquinone and tocopherol in plants. This important biological role has put HPPD in the focus of current herbicide design efforts including the
The multiphasic nature of nonphotochemical quenching: implications for assessment of photosynthetic electron transport based on chlorophyll fluorescence.
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Defining a quantitative relationship between chlorophyll a fluorescence yield and Photosystem II (PS II) function is important to photosynthesis research. Prior work [Peterson and Havir (2003) Photosynth Res 75: 57-70] indicated an apparent effect of psbS genotype on the in vivo rate constant for
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