Abstract:
:The effects of root applications of kinetin, gibberellic acid (GA3) and indoleacetic acid (IAA) on photosynthesis was measured using an open infrared CO2 gas-exchange system. There was a 30-35% increase in the photosynthetic rates (mg CO2/dm(2)/hr) of attached leaves within 8 hr following root treatment with 0.47 μM kinetin. On a short-term basis (up to 2 days) 0.47 μM kinetin was shown to have the optimal stimulatory effect on photosynthesis, relative growth rate (RGR) and total plant dry weight. If the roots were in contact with 0.47 μM kinetin for longer than two days there was severe branching of the root system and growth was severely decreased. When plants were left in contact with the kinetin treatment for up to 7 days the optimal stimulatory concentration was considerably lower (0.0047 μM) . Plants receiving a 4, 8, or 12 hr pulse with 0.47 μM kinetin to the roots exhibited higher leaf photosynthetic rates than the control. Plants receiving an 8 or 12 hr pulse with 0.47 μM kinetin maintained photosynthetic rates higher than the control for the duration of the experiment (8 days) while the 4 hr pulse remained higher than the control for only 5 days. A sharp decrease in the photosynthetic rate, RGR and total plant dry weight was observed two days following continual treatments with 0.47 μM kinetin to the roots. At low light levels there was approximately a 100% increase in the photosynthetic rate two days following treatment with 0.47 μM kinetin while at a saturating irradiance there was a 30 to 35% increase. Indoleacetic acid either showed no effect on the photosynthetic rate, RGR and total plant dry weight or an inhibitory effect was observed. Either GA3 or kinetin alone were shown to stimulate photosynthesis, RGR and total plant dry weight, however, when GA3 at a 1.4 μM concentration was applied in combination with kinetin at a 0.0047 μM concentration to the roots of tomato plants there was no additive effect. In all cases kinetin dramatically reduced leaf resistance whereas GA3 had no effect.By supplying either GA3 or kinetin to the roots of tomato plants a highly reproducible stimulation in the photosynthetic rate, RGR and total plant dry weight can be achieved at physiologically relevant concentrations, whereas IAA appears to have an inhibitory effect.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Dong CN,Arteca RNdoi
10.1007/BF00030048subject
Has Abstractpub_date
1982-01-01 00:00:00pages
45-52issue
1eissn
0166-8595issn
1573-5079journal_volume
3pub_type
杂志文章abstract::The electron transport rates of photosystems II and I, amounts of electron carriers, coupling factor activity and photosynthetic rates were investigated in thylakoids isolated from pea plants grown under a wide range of light intensities (16 h light-8 h dark). The electron transport rates of PS II and PS I, as partial...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028525
更新日期:1984-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-008-9291-4
更新日期:2008-05-01 00:00:00
abstract::The chloroplast genome of the highly neutral-lipid-producing marine pennate diatom Fistulifera sp. strain JPCC DA0580 was fully sequenced using high-throughput pyrosequencing. The general features and gene content were compared with three other complete diatom chloroplast genomes. The chloroplast genome is 134,918 bp ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9622-8
更新日期:2011-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-007-9204-y
更新日期:2007-05-01 00:00:00
abstract::In this paper we compared the pigment composition, photochemical activity, chloroplast ultrastructure, thylakoid membrane polypeptide composition and ribosomal content of wild-type and seven light-sensitive mutants of Chlamydomonas reinhardii.All the mutants had low chlorophyll and carotenoid content compared to wild-...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032261
更新日期:1982-01-01 00:00:00
abstract::The post-translational modification consisting in the formation/reduction of disulfide bonds has been the subject of intense research in plants since the discovery in the 1970s that many chloroplastic enzymes are regulated by light through dithiol-disulfide exchange reactions catalyzed by oxidoreductases called thiore...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-009-9501-8
更新日期:2010-04-01 00:00:00
abstract::Fluorescence and electron paramagnetic resonance measurements were used to study selenium influence on photosystem activity in rape seedlings affected by Cd stress. Water cultures containing Hoagland nutrients were supplemented with 400 microM of CdCl(2), 2 microM of Na(2)SeO(4) and a mixture of both CdCl(2) and Na(2)...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-010-9551-y
更新日期:2010-07-01 00:00:00
abstract::Soybean [Glycine max (L.) Merr. cv. Williams 82 and A3127] plants were grown in the field under long-term soil moisture deficit and irrigation to determine the effects of severe drought stress on the photosynthetic capacity of soybean leaves. Afternoon leaf water potentials, stomatal conductances, intercellular CO2 co...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00051735
更新日期:1990-07-01 00:00:00
abstract::The oxygen flash yield (YO2) and photochemical yield of PS II (ΦPS II) were simultaneously detected in intact Chlorella cells on a bare platinum oxygen rate electrode. The two yields were measured as a function of background irradiance in the steady-state and following a transition from light to darkness. During stead...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029472
更新日期:1996-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00041817
更新日期:1983-01-01 00:00:00
abstract::There is diverse, yet controversial fossil evidence for the existence of photosynthesis 3500 million years ago. Among the most persuasive evidence is the stromatolites described from low grade metasedimentary rocks in Western Australia and South Africa. Based on the understanding of the paleobiology of stromatolites a...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00039172
更新日期:1992-08-01 00:00:00
abstract::In appreciation of his contribution to the Photosystsem II research and commemoration of the book Photosystem II: The Light-Driven Water-Plastoquinone Oxido-Reductase, co-edited with Kimiyuki Satoh, I present here some of my recollections of Thomas John Wydrzynski and by several others with whom he has associated over...
journal_title:Photosynthesis research
pub_type: 传,历史文章,杂志文章
doi:10.1007/s11120-008-9341-y
更新日期:2008-10-01 00:00:00
abstract::The excitation energy transfer between carotenoid and chlorophyll (Chl) in the cytochrome b ( 6 ) f complex from Bryopsis corticulans (B. corticulans), in which the carotenoid is 9-cis-alpha-carotene, was investigated by means of fluorescence excitation and sub-microsecond time-resolved absorption spectroscopies. The ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-005-9020-1
更新日期:2006-04-01 00:00:00
abstract::Envelope membranes were isolated by sucrose density gradient floatation centrifugation from the homogenate of cyanelles prepared from Cyanophora paradoxa. Two yellow bands were separated after 40 h of centrifugation. The buoyant density of one of the two fractions (fraction Y2) coincided with that of inner envelope me...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-007-9156-2
更新日期:2007-07-01 00:00:00
abstract::Cyanobacteria are photosynthetic prokaryotes and widely used for photosynthetic research as model organisms. Partly due to their prokaryotic nature, however, estimation of photosynthesis by chlorophyll fluorescence measurements is sometimes problematic in cyanobacteria. For example, plastoquinone pool is reduced in th...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-017-0367-x
更新日期:2017-09-01 00:00:00
abstract::Modified forms of the D1 protein with deletions in lumen-exposed regions, were constructed in the cyanobacterium Synechocystis 6803 using site-directed mutagenesis. Integration and stability of the mutated D1 proteins in the thylakoid membrane were studied by immunoblot and pulse-chase analyses. It was found that in Δ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00117663
更新日期:1996-08-01 00:00:00
abstract::Cuttings of grapevine (Vitis vinifera L. cv. Chardonnay) were dark-forced at least three weeks. Pigment contents, 77 K fluorescence emission, excitation spectra of the leaves, petioles, stems, transmission electron micrographs of the etioplasts from leaves, the chlorenchyma tissues of the stems were analysed. The dark...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-004-1061-3
更新日期:2004-01-01 00:00:00
abstract::In many ways, the 1963 conference at Airlie House was an unusual event. The meeting convincingly demonstrated that photosynthetic research, previously reported mostly at conferences of botany and/or plant physiology, had become an independent and important field of biological research. New techniques had been develope...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000030427.35645.5c
更新日期:2004-01-01 00:00:00
abstract::This study was conducted to more clearly define the physiological effects of PS II herbicides on chloroplast thylakoid membrane activity and composition. Barley (Hordeum vulgare L. cv Boone) was grown in hydroponic culture at 20°C in a growth chamber with a light intensity of 500 μmole photons m(-2) s(-1). Atrazine (2...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028793
更新日期:1992-04-01 00:00:00
abstract::Photosynthetic electron transfer has been examined in whole cells, isolated membranes and in partially purified reaction centers (RCs) of Roseicyclus mahoneyensis, strain ML6 and Porphyrobacter meromictius, strain ML31, two species of obligate aerobic anoxygenic phototrophic bacteria. Photochemical activity in strain ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9718-1
更新日期:2012-02-01 00:00:00
abstract::Chlorobaculum [Cba.] tepidum is known to grow optimally at 48-52 °C and can also be cultured at ambient temperatures. In this paper, we prepared constant temperature, temperature shift, and temperature shift followed by backshift cultures and investigated the intrinsic properties and spectral features of chlorosomes f...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9800-y
更新日期:2013-05-01 00:00:00
abstract::The first research paper on photosynthesis in China was published by T.T. Li(2) in 1929. Two photosynthesis laboratories were established in Shanghai and Beijing in the 1950s and the 1960s, respectively. A photophosphorylation 'intermediate' was discovered after the energy conversion process was separated into light a...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1024946222187
更新日期:2003-01-01 00:00:00
abstract::Chlorosomes of green photosynthetic bacterium Chlorobium tepidum contain aggregates of bacteriochlorophyll c (BChl c) with carotenoids and isoprenoid quinones. BChl aggregates with very similar optical properties can be prepared also in vitro either in non-polar solvents or in aqueous buffers with addition of lipids a...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-007-9259-9
更新日期:2008-02-01 00:00:00
abstract::A comparative study of photosystem II complexes isolated from tobacco (Nicotiana tabacum L. cv. John William's Broadleaf) which contains normal stacked thylakoid membranes, and from two chlorophyll deficient tobacco mutants (Su/su and Su/su var. Aurea) which have low stacked grana or essentially unstacked thylakoids w...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032264
更新日期:1987-01-01 00:00:00
abstract::Two species-invariant tryptophan residues at positions 109 and 250 of tobacco Rubisco activase were identified by site-directed mutagenesis as being responsible for the increase in intrinsic fluorescence upon addition of ATP, which has been previously attributed to increased self-association. Substitution of W109, whi...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-006-9051-2
更新日期:2006-05-01 00:00:00
abstract::The rate and extent of light activation of PEPC may be used as another criterion to distinguish C3 and C4 plants. Light stimulated phosphoenolypyruvate carboxylase (PEPC) in leaf discs of C4 plants, the activity being three times greater than that in the dark but stimulation of PEPC was limited about 30% over the dark...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00015061
更新日期:1993-10-01 00:00:00
abstract::Sulfur is one of the critical elements in living matter, as it participates in several structural, metabolic and catalytic activities. Photosynthesis is an important process that entails the use of sulfur during both the light and carbon reactions. Nearly half of global photosynthetic carbon fixation is carried out by...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-005-3250-0
更新日期:2005-12-01 00:00:00
abstract::The quantum yield for light-induced H2 generation was measured for a previously optimized bio-hybrid cytochrome c 6-crosslinked PSI(C13G)-1,8-octanedithiol-[FeFe]-H2ase(C97G) (PSI-H2ase) nanoconstruct. The theoretical quantum yield for the PSI-H2ase nanoconstruct is 0.50 molecules of H2 per photon absorbed, which equa...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-014-0064-y
更新日期:2016-01-01 00:00:00
abstract::In studies on photosynthetic systems it is common practice to interpret the results of time-resolved fluorescence experiments on the basis of compartmental, or target, models. Each compartment represents a group of molecules with similar fluorescence characteristics. In cases of practical interest, the members of each...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00014883
更新日期:1996-11-01 00:00:00
abstract::We present a theoretical study of excitation dynamics in the chlorosome antenna complex of green photosynthetic bacteria based on a recently proposed model for the molecular assembly. Our model for the excitation energy transfer (EET) throughout the antenna combines a stochastic time propagation of the excitonic wave ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-014-9978-7
更新日期:2014-06-01 00:00:00