Abstract:
:Water and solute relations of excised seminal roots of young maize (Zea mays L) plants, have been measured using the root pressure probe. Upon addition of osmotic solutes to the root medium, biphasic root pressure relaxations were obtained as theoretically expected. The relaxations yielded the hydraulic conductivity Lp r) the permeability coefficient (P sr), and the reflection coefficient (σ sr) of the root. Values of Lp r in these experiments were by nearly an order of magnitude smaller than Lp r values obtained from experiments where hydrostatic pressure gradients were used to induce water flows. The value of P sr was determined for nine different osmotica (electrolytes and nonelectrolytes) which resulted in rather variable values (0.1·10(-8)-1.7·10(-8)m·s(-1)). The reflection coefficient σ sr of the same solutes ranged between 0.3 and 0.6, i.e. σ sr was low even for solutes for which cell membranes exhibit a σ s≈1. Deviations from the theoretically expected biphasic responses occured which may have reflected changes of either P sr or of active pumping induced by the osmotic change. The absolute values of Lp r, P sr, and σ sr have been critically examined for an underestimation by unstirred layer effecs. The data indicate a considerable apoplasmic component for radial movement of water in the presence of hydrostatic gradients and also some solute flow byppassing root protoplasts. In the presence of osmotic gradients, however, there was a substantial cell-to-cell transport of water. Cutting experiments demonstrated that the hydraulic resistance for the longitudinal movement of water was much smaller than for radial transport except for the apical ends of the segments (length=5 to 20 mm). The differences in Lp r as well as the low σ sr values suggest that the simple osmometer model of the root with a single osmotic barrier exhibiting nearly semipermeable properties should be extended for a composite membrane model with hydraulic and osmotic barriers arranged in series and in parallel.
journal_name
Plantajournal_title
Plantaauthors
Steudle E,Frensch Jdoi
10.1007/BF00403585subject
Has Abstractpub_date
1989-03-01 00:00:00pages
281-95issue
3eissn
0032-0935issn
1432-2048journal_volume
177pub_type
杂志文章相关文献
PLANTA文献大全abstract::Rhodococcus fascians is a Gram-positive bacterium that infects dicotyledonous and monocotyledonous plants, leading to an alteration in the normal growth process of the host. The disease results from the modulation of the plant hormone balances, and cytokinins are thought to play an important role in the induction of s...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/PL00008131
更新日期:2000-01-01 00:00:00
abstract::The qualitative and quantitative composition of the carotenoids of young cells of Euglena gracilis strain 1224-5/9 corresponded to that of the "Z"-strain.The frequently observed yellow-reddish discolouration of ageing cells was found to be caused by a heavy breakdown of the chlorophylls and not by an increased synthes...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387621
更新日期:1971-06-01 00:00:00
abstract::The high rate of respiration in Chlorella which is found after feeding with glucose or after a longer period of photosynthesis, declines in the dark in the course of hours to about a quarter of its original value. Blue-green light (λ<550 mμ) specifically counteracts this decline and maintains the high rate. This blue ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380214
更新日期:1966-03-01 00:00:00
abstract::Nitric oxide (NO), an endogenous signaling molecule in animals and plants, mediates responses to abiotic and biotic stresses. Our previous work demonstrated that 100 microM sodium nitroprusside (SNP, an NO donor) treatment of maize seedlings increased K(+) accumulation in roots, leaves and sheathes, while decreasing N...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-006-0242-z
更新日期:2006-08-01 00:00:00
abstract::Sugar-synthesis and -transport patterns were analyzed in Coleus blumei Benth. leaves to determine where galactinol, raffinose, and stachyose are made and whether phloem loading includes an apoplastic (extracellular) step or occurs entirely within the symplast (plasmodesmata-connected cytoplasm). To clarify the sequenc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00195663
更新日期:1992-06-01 00:00:00
abstract::Sequestered particles of phytochrome (SAPs) were partially purified from red-light-irradiated oat coleoptiles. Phytochrome pelletability was enhanced by using buffers containing 10 mM Mg(2+) or high concentrations (0.6-0.8 M) of orthophosphate (Pi). Combining the pelletability of phytochrome in the presence of Mg(2+) ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00197798
更新日期:1991-01-01 00:00:00
abstract::The developmental morphology and growth dynamics of the leaf of Nicotiana tabacum L. cv. Xanthi Nc. are described. Epidermal and internal cell patterns indicate that the leaf axis arises from approx. 100 cells in four layers of the shoot apex, while the lamina arises from several rows of cells in each of three layers ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00395038
更新日期:1985-08-01 00:00:00
abstract::Borya nitida Labill., a plant able to colonize rock outcrops and shallow sands in areas of high incident solar radiation in Western Australia, was examined for its tolerance to extremes of temperature, and to intense visible radiation. Stress injury to the leaves from heat, chilling or photoinhibitory light was follow...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00402935
更新日期:1982-06-01 00:00:00
abstract::A brief irradiation with red light of pea (Pisum sativum L.) shoot segments kept at 0° resulted in very rapid binding of both Pr and Pfr to mitochondrial and microsomal fractions. The effect was not far-red reversible. The amount of phytochrome bound to the mitochondrial fraction was proportional to the percentage of ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390699
更新日期:1975-01-01 00:00:00
abstract:MAIN CONCLUSION:Coleoptera, the largest and the most diverse Insecta order, is characterized by multiple adaptations to plant feeding. Insect-associated microorganisms can be important mediators and modulators of interactions between insects and plants. Interactions between plants and insects are highly complex and inv...
journal_title:Planta
pub_type: 杂志文章,评审
doi:10.1007/s00425-016-2543-1
更新日期:2016-08-01 00:00:00
abstract::A sensitive new fluorescent method is outlined for the study of peptide and amino acid transport processes. Studies on dipeptide transport in germinating barley (Hordeum vulgare.) embryos have provided evidence for accumulation of substrate against a concentration gradient, saturation kinetics, a pH optimum at pH 3.8,...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387928
更新日期:1977-01-01 00:00:00
abstract::Endophytic isolates of Trichoderma species are being considered as biocontrol agents for diseases of Theobroma cacao (cacao). Gene expression was studied during the interaction between cacao seedlings and four endophytic Trichoderma isolates, T. ovalisporum-DIS 70a, T. hamatum-DIS 219b, T. harzianum-DIS 219f, and Tric...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-006-0314-0
更新日期:2006-11-01 00:00:00
abstract::The effects of (+)-8',8',8'-trifluoroabscisic acid (trifluoro-ABA) on alpha-amylase expression were studied in rice embryoless half-seeds, scutella, and suspension-cultured cells derived from the embryo, and the effects of the analog on sugar accumulation were also studied in scutella and suspension-cultured cells. Tr...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050326
更新日期:1998-07-01 00:00:00
abstract::Mixed membrane preparations from the coleoptiles and first leaves of young barley (Hordeum vulgare L. cv. Triumph) plants catalysed the synthesis of 55% methanol-insoluble labelled material from UDP-[U-14C]glucose, the main components of which were identified as (1,3)(1,4)-beta- and (1,3)-beta-D-glucans. The membrane ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00202589
更新日期:1995-01-01 00:00:00
abstract::Haploid callus cultures of selected races of Lycopersicon (tomato) species can be obtained from anther culture. This is a further demonstration of a proposed general method of haploid culture developed with Arabidopsis thaliana. Differentiation of haploid callus of Lycopersicon esculentum can be controlled both in the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387721
更新日期:1972-06-01 00:00:00
abstract::Bax inhibitor-1 (BI-1) is a widely conserved cell death suppressor localized in the endoplasmic reticulum membrane. Our previous results revealed that Arabidopsis BI-1 (AtBI-1) interacts with not only Arabidopsis cytochrome b 5 (Cb5), an electron transfer protein, but also a Cb5-like domain (Cb5LD)-containing protein,...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-014-2065-7
更新日期:2014-07-01 00:00:00
abstract::Gas exchange, leaf water relations, malate content and phosphoenolpyruvate (PEP) carboxylase activity in crude extracts were examined for circadian rhythmicity in the crassulacean acid metabolism plant Kalanchoë daigremontiana. At low irradiance (20 W m(-2)) the rhythm in CO2 uptake continued for several days with a p...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00398721
更新日期:1984-06-01 00:00:00
abstract::Frequency, density and branching of plasmodesmata were counted in successive tangential and transverse walls in the cambial zone of tomato stems in order to examine development of the plasmodesmal network in a chronological order. Coincident with progress of cell development, plasmodesmal connectivity increased, both ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-009-1046-8
更新日期:2010-01-01 00:00:00
abstract::The castor-bean endosperm-the best-studied material of reserve lipid hydrolysis in seed germination-was previously shown to have an acid lipase and an alkaline lipase having reciprocal patterns of development during germination. We studied oil seeds from 7 species, namely castor bean (Ricinus communis L.), peanut (Ara...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387752
更新日期:1978-01-01 00:00:00
abstract::Illumination of a liquid culture of Synechococcus 6301 at high photon flux density (PFD) elicits a time-dependent first-order exponential decline in relative quantum yield of photosynthetic O2 evolution to some steady-state value. Full photosynthetic activity is restored, also as a time-dependent first-order process, ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00195324
更新日期:1992-02-01 00:00:00
abstract::Phototropic stimulation induces a spatial memory. This was inferred from experiments with maize (Zea mays L.) coleoptiles involving opposing blue-light pulses, separated by variable time intervals, and rotation on a horizontal clinostat (Nick and Schafer, 1988b, Planta 175, 380-388). In those experiments, individual s...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00201066
更新日期:1991-10-01 00:00:00
abstract:MAIN CONCLUSION:Drought-tolerant rice variety, Nagina 22 (N22), has a unique spikelet miRNome during anthesis stage drought as well as transition from heading to anthesis. Molecular characterization of genetic diversity of rice is essential to understand the evolution and molecular basis of various agronomically import...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-015-2279-3
更新日期:2015-06-01 00:00:00
abstract::In several plant species, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activase consists of two isoforms that are produced by alternative splicing of a pre-mRNA. Two forms of activase corresponding to the longer, redox-regulated alpha and the shorter, beta forms were detected immunologically in cotton (Go...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-002-0923-1
更新日期:2003-03-01 00:00:00
abstract::Efficiency of novel fiber formation was much improved in protoplast culture of embryogenic cells (ECs) of a conifer, Larix leptolepis (Sieb. et Zucc.) Gord., by pre-culturing ECs in a medium containing a high concentration of glutamine (13.7 mM). The fibrillar substructures of large and elongated fibers of protoplasts...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-005-0065-3
更新日期:2005-12-01 00:00:00
abstract::Influx of (45)Ca into internodal cells of Chara corallina has been measured, using short uptake times, and a wash in ice-cold La(3+)-containing pondwater after the labelling period to overcome the difficulty of distinguishing extracellular tracer from that in the cell. Over 5-15 min the uptake was linear with time, th...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392485
更新日期:1988-11-01 00:00:00
abstract::Agrobacterium tumefaciens-induced tumors of dicotyledonous plants consist of well-defined vascular bundle-like structures originating from transformed cells. The current view that 25% of the tumor cells are transformed has been re-investigated by using beta-glucuronidase (gus)-gene-containing wild-type bacteria (A281 ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050742
更新日期:1999-10-01 00:00:00
abstract::The lipid compositions of leaves from Festuca pratensis cv. Rossa (yellowing) were compared with those from a non-yellowing mutant, Bf 993. The leaves of Bf 993 contained a higher level of acyl lipids on both a fresh-weight and a dry-weight basis. Diacylgalactosylglycerol, diacylgalabiosylglycerol and phosphatidylinos...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00395429
更新日期:1982-11-01 00:00:00
abstract::Changes in the uronide, neutral-polysacharide, and cellulose composition of the cell wall ofNitella axillaris Braun were followed throughout development of the internodes and correlated with changes in growth rate. As the cells increased in length from 4 to 80 mm during development, the relative growth rate decreased....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF01607568
更新日期:1982-11-01 00:00:00
abstract::To explore the feasibility of immunolocalisation of endogenous abscisic acid (ABA), model systems were developed for testing quantitatively the sensitivity of the second antibody peroxidase/antiperoxidse (PAP) method for immunolocalisation of ABA on plant tissues. Exogenous (±)ABA was fixed to carrot sections on glass...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394587
更新日期:1987-10-01 00:00:00
abstract::Indole-3-acetic acid (IAA) promotes an increase in steady-state heat production by corn (Zea mays L.) coleoptile tissue; this increase is associated with an elevation in aerobic respiration rates. A detailed time dependence of the exothermic response to IAA was obtained using flow calorimetry. The latent period and ma...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387426
更新日期:1981-05-01 00:00:00