Abstract:
:Terminal buds of Pinus silvestris L. containing microsporangiate strobilus primordia were collected once a month throughout the winter. The electron microscopic studies indicated that in October and December, the cells of the strobili contained a large number of vacuoles, a portion of which was supposedly autophagic, and stacked rough endoplasmic reticulum. By February, the amount of these had decreased, and instead, a large population of dense bodies was visible. Additional phenomena, characteristic at this state, were the occurrences of highly uneven contours of the plasmalemma and of inclusions of various kinds between the plasmalemma and the cell wall. In March, autolysis was visible in a portion of cells outside the sporangia. In the sporangia the ground cytoplasm was thin but the number of organelles was increasing. In the April collections, cell divisions were visible. The amount of protein per dry weight increased during the winter reaching a peak in February. The activity of RNases, having optima of pH 5.0 and pH 7.5, was measured in two successive years. Both series showed a period of high activity during the middle of the winter. The exact timing of this period depended on the year in question. On the basis of these observations, the dormant period of the microsporangiate strobili of the Seotch pine is divided into three sub-periods. It is also suggested that the definition of dormancy of these structures should include a mentioning of alterations in the metabolical machinery of the cells.
journal_name
Plantajournal_title
Plantaauthors
Kupila-Ahvenniemi S,Pihakaski S,Pihakaski Kdoi
10.1007/BF00385003subject
Has Abstractpub_date
1978-01-01 00:00:00pages
19-29issue
1eissn
0032-0935issn
1432-2048journal_volume
144pub_type
杂志文章相关文献
PLANTA文献大全abstract::We have investigated the regulation of sucrose storage in cell-suspension cultures of sugarcane. When grown in batch culture, sucrose accumulation commences after about 5 d, when the nitrogen supply is exhausted. Sucrose storage is also induced by decreasing the nitrogen supply to cells growing in a chemostat. The mea...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00197564
更新日期:1991-12-01 00:00:00
abstract::Carnivorous plants acquire substantial amounts of nitrogen from insects. The tropical carnivorous plant Nepenthes produces trapping organs called pitchers at the tips of tendrils elongated from leaf ends. Acidic fluid is secreted at the bottoms of the pitchers. The pitcher fluid includes several hydrolytic enzymes, an...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-002-0768-7
更新日期:2002-07-01 00:00:00
abstract::Gibberellic acid (GA3) enhances ultrastructural morphogenesis of plastids in greening cereals whilst abscisic acid (ABA) and CCC have the reverse effect over a shorter period. GA3 application counteracts the ABA and CCC inhibition of membrane development and, over longer periods of greening, the fastest rate of chloro...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385553
更新日期:1973-12-01 00:00:00
abstract::Three non-allelic radial swelling mutants (rsw1, rsw2 and rsw3) of Arabidopsis thaliana L. Heynh. were shown to be specifically impaired in cellulose production. Fractionation methods that identify, characterise and quantify some of the major cell wall polysaccharides in small quantities of seedlings demonstrated that...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250000301
更新日期:2000-08-01 00:00:00
abstract::From compartmental analysis of radioisotope elutin measurements, fluxes of Ca(2+) were estimated for cortical cells in root segments of onion, Allium cepa L., relative to complete nutrient solutions containing a range of calcium concentrations ([Ca0]) from 2 μeq l(-1) to 20 meq l(-1), increasing in 10-fold steps for C...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385353
更新日期:1981-08-01 00:00:00
abstract::Preharvest aflatoxin contamination has been identified by the peanut industry as a serious issue in food safety and human health because of the carcinogenic toxicity. Drought stress is the most important environmental factor exacerbating Aspergillus infection and aflatoxin contamination in peanut. The development of d...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-005-0112-0
更新日期:2006-02-01 00:00:00
abstract::C2H4 production of the embryonic axes and cotyledons excised from dormant and non-dormant cocklebur (Xanthium pennsylvanicum Wallr.) seeds was examined in relation to ambient O2 tensions. There were two kinds of C2H4-producing systems, quasi-anaerobic and aerobic, in both organs. Regardless of the organ, the former ac...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390908
更新日期:1976-01-01 00:00:00
abstract::Earlier experiments (T.D. Brock 1975, Planta124, 13-23) addressed the question whether the fungus of the lichen thallus might enable the algal component to function when moisture stress is such that the algal component would be unable to function under free-living conditions. It was concluded that the liberated phycob...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF02411401
更新日期:1990-10-01 00:00:00
abstract::Strigolactones that are released by plant roots to the rhizosphere are involved in both plant symbiosis with arbuscular mycorrhizal fungi and in plant infection by root parasitic plants. In this paper, we describe the response of various phytopathogenic fungi to the synthetic strigolactone GR24. When GR24 was embedded...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-011-1452-6
更新日期:2011-08-01 00:00:00
abstract::The plastid terminal oxidase (PTOX) is a plastoquinol oxidase involved in carotenoid biosynthesis in higher plants, and may also represent the elusive oxidase in chlororespiration. Haematococcus pluvialis is a green alga that has the ability to synthesize and accumulate large amounts of the red carotenoid astaxanthin ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-009-0932-4
更新日期:2009-06-01 00:00:00
abstract:MAIN CONCLUSION:Exogenously applied 2% fructose is the most appropriate carbon source that enhances photosynthesis and growth of grape plantlets compared with the same concentrations of sucrose and glucose. The role of the sugars was regulated by the expression of key candidate genes related to hormones, key metabolic ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-017-2712-x
更新日期:2017-09-01 00:00:00
abstract::Shampoo ginger (Zingiber zerumbet Smith) has a high content and large variety of terpenoids in the essential oil of its rhizome. Here, we report on the isolation of a cDNA clone (ZSS1) encoding alpha-humulene synthase, a possible key enzyme of zerumbone biosynthesis. This clone contains an open reading frame of 1,644 ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-008-0700-x
更新日期:2008-05-01 00:00:00
abstract:MAIN CONCLUSION:Our work strongly suggests that microRNA858 regulates anthocyanin biosynthesis in tomato by modulating the expression of two R2R3 MYB transcription factors, underscoring the importance of microRNAs in the gene regulatory network controlling specialized metabolism in plants. The biological functions of m...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-015-2305-5
更新日期:2015-07-01 00:00:00
abstract::Plants have efficient water-transporting vascular networks with a self-recovery function from embolism, which causes fatal discontinuity in sap flow. However, the embolism-refilling process in xylem vessel is still unclear. The water-refilling processes in the individual xylem vessels of excised Arabidopsis roots were...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-013-1889-x
更新日期:2013-08-01 00:00:00
abstract::Nitrite reductase (EC 1.6.6.4) prepared from pea roots was found to be immunologically indistinguishable from pea leaf nitrite reductase. Comparisons of the pea root enzyme with nitrite reductase from leaf sources showed a close similarity in inhibition properties, light absorption spectrum, and electron paramagnetic ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00396338
更新日期:1988-09-01 00:00:00
abstract::A major wall protein of suspension-cultured cells of French bean has been isolated and characterised. It can be prepared from walls or the culture filtrate and in composition it is particularly rich in proline, valine and glutamic acid/glutamine and contains appreciable amounts of hydroxyproline. The N-terminus shows ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00201935
更新日期:1992-05-01 00:00:00
abstract:MAIN CONCLUSION:UV - B radiation exposure for upto 3 h did not cause direct damage to physiology, but adjusted secondary metabolism and metabolites accumulation as an effective acclimation mechanism to mitigate the adverse effects of radiation. Artemisia annua L. plants were irradiated with UV-B radiation (280-315 nm; ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-014-2114-2
更新日期:2014-09-01 00:00:00
abstract::Cells of Chlamydomonas reinhardtii Dang. wild type and the cell-wall mutants cw2 and cw15 were grown synchronously. The two mutants secreted copious amounts of cell-wall-like glycoproteins into the culture medium in contrast to the wild type which released only minor quantities. Both the secreted proteins as well as t...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00194001
更新日期:1990-01-01 00:00:00
abstract::Transmission electron microscopy and immunocytological labeling were used to study the distribution and ontological occurrence of dinitrogenase reductase (Fe-protein) of nitrogenase in cyanobacterial symbionts within young leaves of the water-ferns Azolla filiculoides Lamarck, A. caroliniana Willdenow, and A. pinnata ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00395412
更新日期:1988-12-01 00:00:00
abstract::Seedlings of Amaranthus caudatus L. var. Pendula were used to study the influence of several treatment: white light, 3,4-dihydroxyphenylalanine (DOPA), kinetin, gibberellic acid (GA3) on betalains biosynthesis. The pigments, betacyanins and betaxanthins, were separated using a Sephadex G-15 column chromatography. Qual...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380880
更新日期:1980-07-01 00:00:00
abstract::Plastids of Cuscuta reflexa Roxb., C. subinclusa D. et H., C. gronovii Willd. and C. campestris Yunck. possess thylakoids and contain both chlorophyll a and b in a ratio similar to that of stem tissue of the systematically closely related but 'normal' green Ipomoea tricolor. In contrast, plastids of C. odorata R. et P...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050670
更新日期:2000-04-01 00:00:00
abstract::A photomixotrophic tissue culture system for Nicotiana plumbaginifolia and N. tabacum has been developed in which a primary symptom (bleching) of the inhibition of photosynthetic electron transport by herbicides can be observed. Photomixotrophic cultures were initiated and maintained in the light on medium containing ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00407004
更新日期:1986-05-01 00:00:00
abstract::Gas chromatographic-mass spectroscopic evidence is presented for the presence of arachidonic acid ((all-Z)-5,8,11,14-eicosatetraenoic acid) in virgin wheat-germ oil. The amount of arachidonic acid in wheat-germ oil, determined as methyl ester using gas chromatographic detection, was quantified with reference to a stan...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00429462
更新日期:1982-08-01 00:00:00
abstract::Photosynthesis of Helianthus annuus L. leaves was transiently inhibited and respiration was stimulated when a leaf was detached from the plant by cutting the petiole under water. These effects were caused by a solute which was released by cutting and was transported by the transpiration stream to the leaf blade. This ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00403595
更新日期:1989-03-01 00:00:00
abstract::During anaerobiosis in darkness the main route for ATP production in plants is through glycolysis in combination with fermentation. We compared the organ-specific anaerobic fermentation of flooding-tolerant rice (Oryza sativa) and sensitive wheat (Triticum aestivum) seedlings. A sensitive laser-based photoacoustic tra...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-006-0333-x
更新日期:2006-12-01 00:00:00
abstract:MAIN CONCLUSION:Our study demonstrated that symplasmic communication between Sedum acre seed compartments and the embryo proper is not uniform. The presence of plasmodesmata (PD) constitutes the structural basis for information exchange between cells, and symplasmic communication is involved in the regulation of cell d...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-016-2619-y
更新日期:2017-03-01 00:00:00
abstract:MAIN CONCLUSION:Phloem production and structural development were interlinked with seasonal variation in the primary and secondary metabolites of phloem. Novel microtechniques provided new perspectives on understanding phloem structure and chemistry. To gain new insights into phloem formation in Norway spruce (Picea ab...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-015-2347-8
更新日期:2015-09-01 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::Leaves of plants with Crassulacean acid metabolism (CAM) were analyzed for variation in the content of polyamines in connection with the metabolism of malic acid in the dark and in the light, and with the induction of full-CAM activity. Under conditions (long days) resulting in extremely low CAM activity, young leaves...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385745
更新日期:1980-10-01 00:00:00
abstract::In cells of Zea mays (root hairs, coleoptiles) and Riccia fluitans (rhizoids, thalli) intracellular Ca(2+) and pH have been measured with double-barrelled microelectrodes. Free Ca(2+) activities of 109-187 nM (Riccia rhizoids), 94-160 nM (Riccia thalli), 145-231 nM (Zea root hairs), 84-143 nM (Zea coleoptiles) were fo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392452
更新日期:1988-11-01 00:00:00