Cytomixis in tobacco microsporogenesis: are there any genome parts predisposed to migration?

abstract：:We discuss models for production of tubulin flux in kinetochore microtubules. Current models concentrate solely on microtubules and their associated motors and enzymes. For example, in some models the driving force for flux is enzymes at the poles and the kinetochores; in others the driving force is motor molecules th...

journal_title：Protoplasma

authors： Forer A,Pickett-Heaps JD,Spurck T

更新日期：2008-01-01 00:00:00

abstract：:In the Cape Fynbos of South Africa, Psoralea pinnata (L.) plants occur naturally in both wetland and well-drained soils and yet effectively fix N2 under the two contrasting conditions. In this study, nodule structure and functioning in P. pinnata plants from the two habitats were evaluated using light and transmission...

journal_title：Protoplasma

authors： Kanu SA,Dakora FD

更新日期：2017-01-01 00:00:00

abstract：:The mature apomictic embryo sac of Chondrilla juncea is highly vacuolated and demonstrates a polarization similar to that of the amphimictic gametophyte. The microtubule cytoskeleton of this embryo sac is uncharacteristic and relatively weak. The microtubules are positioned along cell walls and resemble cortical micro...

journal_title：Protoplasma

authors： Kościńska-Pajak M,Bednara J

更新日期：2006-05-01 00:00:00

abstract：:Pollen developmental pathway in plants involving synchronized transferal of cellular divisions from meiosis (microsporogenesis) to mitosis (pollen mitosis I/II) eventually offers a unique "meiosis-mitosis shift" at pollen mitosis I. Since the cell type (haploid microspore) and fate of pollen mitosis I differ from typi...

journal_title：Protoplasma

authors： Sharma SK,Yamamoto M,Mukai Y

更新日期：2017-01-01 00:00:00

abstract：:The classification of order Nostocales (Cyanobacteria) and inter relationships of morphologically similar taxa is still debatable due to ever changing morphological features. No attempt has been made to improve the morphological taxonomy despite the fact that it is the morphology that represents the totality of genes....

journal_title：Protoplasma

authors： Mishra S,Bhargava P,Adhikary SP,Pradeep A,Rai LC

更新日期：2015-01-01 00:00:00

abstract：:Programmed cell death occurs in plants during several developmental processes and during the expression of resistance to pathogen attack (i.e., the hypersensitive response). An unsolved question of plant programmed cell death is whether a unique signaling pathway or different, possibly convergent pathways exist. This ...

journal_title：Protoplasma

authors： Malerba M,Cerana R,Crosti P

更新日期：2004-10-01 00:00:00

abstract：:Developing flowers are important sinks in Arabidopsis thaliana. Their energy demand is covered by assimilates which are synthesized in source leaves and transported via the vasculature. Assimilates are unloaded either symplastically through plasmodesmata or apoplastically by specific transport proteins. Here we studie...

journal_title：Protoplasma

authors： Werner D,Gerlitz N,Stadler R

更新日期：2011-01-01 00:00:00

abstract：:The larvae of Bittacidae, a cosmopolitan family in Mecoptera, have an interesting habit of spraying the body surface with soil through the anus after hatching, and each molts. The fine structure of Malpighian tubules, however, remains largely unknown in the larvae of Bittacidae to date. Here, we studied the ultrastruc...

journal_title：Protoplasma

authors： Liu L,Hua BZ

更新日期：2018-07-01 00:00:00

abstract：:The cryptomonad nucleomorph is a vestigial nucleus of a eukaryotic red alga engulfed by a phagotrophic protist and retained as a photosynthetic endosymbiont. This review recounts the initial discovery and subsequent characterisation of the cryptomonad nucleomorph focusing on the key role of Peter Sitte and his protégé...

journal_title：Protoplasma

authors： McFadden GI

更新日期：2017-09-01 00:00:00

abstract：:Plant embryogenesis is regulated by differential distribution of the plant hormone auxin. However, the cells establishing these gradients during microspore embryogenesis remain to be identified. For the first time, we describe, using the DR5 or DR5rev reporter gene systems, the GFP- and GUS-based auxin biosensors to m...

journal_title：Protoplasma

authors： Dubas E,Moravčíková J,Libantová J,Matušíková I,Benková E,Zur I,Krzewska M

更新日期：2014-09-01 00:00:00

abstract：:Agrobacterium-mediated transformation of chickpea (Cicer arietinum L.) has been performed using cotyledonary node explants (CNs), which release phenolics upon excision that are detrimental to the viability of Agrobacterium tumefaciens and result in low transformation frequency. Twelve low molecular weight phenolic com...

journal_title：Protoplasma

authors： Yadav R,Mehrotra M,Singh AK,Niranjan A,Singh R,Sanyal I,Lehri A,Pande V,Amla DV

更新日期：2017-01-01 00:00:00

abstract：:The actin-nucleating and -organizing Arp2/3 protein complex is well known to be conserved throughout the eukaryotic kingdom. For higher plants, however, only limited evidence is available for the presence of the Arp2/3 complex so far. Using heterologous antibodies against the Dictyostelium discoideum and Schizosacchar...

journal_title：Protoplasma

authors： Van Gestel K,Slegers H,Von Witsch M,Samaj J,Baluska F,Verbelen JP

更新日期：2003-09-01 00:00:00

abstract：:Autophagy is an important mechanism for recycling cell materials upon encountering stress conditions. Our previous studies had shown that TMV infection could lead to systemic PCD in the distal uninfected tissues, including root tip and shoot tip tissues. But it is not clear whether there is autophagy in the distal api...

journal_title：Protoplasma

authors： Zhou S,Hong Q,Li Y,Li Q,Li R,Zhang H,Wang M,Yuan X

更新日期：2018-01-01 00:00:00

abstract：:A survey is presented of the architecture of secondary wall ingrowths in transfer cells from various taxa based on scanning electron microscopy. Wall ingrowths are a distinguishing feature of transfer cells and serve to amplify the plasma membrane surface area available for solute transport. Morphologically, two categ...

journal_title：Protoplasma

authors： Talbot MJ,Offler CE,McCurdy DW

更新日期：2002-05-01 00:00:00

abstract：:It is well established that cytoplasmic microtubules are depolymerized during nuclear division and reassembled as mitotic microtubules. Mounting evidence showing that cytoplasmic microtubules were also involved in apical growth of fungal hyphae posed the question of whether apical growth became disrupted during nuclea...

journal_title：Protoplasma

authors： Riquelme M,Fischer R,Bartnicki-García S

更新日期：2003-01-01 00:00:00

abstract：:In the genus Genlisea as well as in its sister genus Utricularia, the palate probably plays a key role in providing the colour, mechanical and olfactory stimuli to attract insect pollinators and to guide them to the generative structures and the nectary spur. However, information about the micro-morphology of the pala...

journal_title：Protoplasma

authors： Płachno BJ,Świątek P,Stpiczyńska M,Miranda VFO

更新日期：2018-07-01 00:00:00

abstract：:The dinoflagellate Crypthecodinium cohnii Biecheler propagates by both binary and multiple fission. By a newly developed mutagenesis protocol based on using ethyl methanesulfonate and a cell size screening method, a cell cycle mutant, mf2, was isolated with giant cells which predominantly divide by multiple fission. T...

journal_title：Protoplasma

authors： Lam CM,Chong C,Wong JT

更新日期：2001-01-01 00:00:00

abstract：:The F-actin distribution in caulonemal tip cells of the moss Ceratodon purpureus was examined by rhodamine-phalloidin staining. Gravitropically-growing caulonemal tip cells of the moss possess a distinct alignment of microfilaments (MFs) in their apices. Axially oriented actin bundles run from subapical regions to the...

journal_title：Protoplasma

authors： Meske V,Hartmann E

更新日期：1995-01-01 00:00:00

abstract：:Superoxide dismutase (SOD) activities of the oomycete Phytophthora cinnamomi were examined. Five polypeptides with manganese superoxide dismutase (MnSOD) activity were found in mycelium growing in liquid culture with relative molecular weights ranging from approximately 25 to 100 kDa. Comparison with characterized avo...

journal_title：Protoplasma

authors： Guzmán-Deara J,Reyes-De la Cruz H,Beltrán-Peña EM,Castro-Mercado E,García-Pineda E

更新日期：2013-06-01 00:00:00

abstract：:The histochemical studies that search for osmophores differ in the protocol they follow for fixation and discoloration of the samples, and also in the type and number of stains utilized. Despite these differences, all the studies have one point in common: the use of fresh material either collected directly in the fiel...

journal_title：Protoplasma

authors： Hernández MP,Katinas L

更新日期：2019-11-01 00:00:00

abstract：:Proper mitochondrial morphogenesis is crucial for successful development of motile sperm. It was known that recessive Drosophila melanogaster mutation emm caused anomalies in the formation of a mitochondrial derivative--nebenkern and led to male sterility. Here we identified primary mutation effect and showed that emm...

journal_title：Protoplasma

authors： Dorogova NV,Bolobolova EU,Akhmetova KA,Fedorova SA

更新日期：2013-04-01 00:00:00

abstract：:Salt stress in the rice field is one of the most common abiotic stresses, reducing crop productivity, especially at reproductive stage, which is very sensitive to salt stress. The aim of this investigation was to study mRNA-related Na+ uptake/translocation and Na+ enrichment in the cellular level, leading to physiolog...

journal_title：Protoplasma

authors： Theerawitaya C,Samphumphuang T,Tisarum R,Siangliw M,Cha-Um S,Takabe T,Toojinda T

更新日期：2020-11-01 00:00:00

abstract：:Interactive effects of two heavy metal pollutants Cd and Pb in the growth medium were examined on their uptake, production of reactive oxygen species (ROS), induction of oxidative stress and antioxidative defence responses in Indica rice (Oryza sativa L.) seedlings. When rice seedlings in sand culture were exposed to ...

journal_title：Protoplasma

authors： Srivastava RK,Pandey P,Rajpoot R,Rani A,Dubey RS

更新日期：2014-09-01 00:00:00

abstract：:Isolated microspores of B. napus in culture change their developmental pathway from gametophytic to sporophytic and form embryo-like structures (ELS) upon prolonged heat shock treatment (5 days at 32 °C). ELS express polarity during the initial days of endosporic development. In this study, we focussed on the analysis...

journal_title：Protoplasma

authors： Dubas E,Custers J,Kieft H,Wędzony M,van Lammeren AA

更新日期：2014-01-01 00:00:00

abstract：:Endoplasmic reticulum (ER) is a major site for secretory protein folding and lipid synthesis. Since ER cannot be synthesized de novo, it must be inherited during the cell cycle. Studying ER inheritance can however be difficult because the ER of typical plant and animal cells is morphologically complex. Therefore, our ...

journal_title：Protoplasma

authors： Yagisawa F,Fujiwara T,Kuroiwa H,Nishida K,Imoto Y,Kuroiwa T

更新日期：2012-10-01 00:00:00

abstract：:Short-time temperature effects (34-40 °C) on microtubule (MT) organization and on cell structure of young epidermal leaf cells of the seagrass Cymodocea nodosa were investigated under laboratory conditions using transmission electron microscopy (TEM) and tubulin immunofluorescence. The interphase MT network was affect...

journal_title：Protoplasma

authors： Koutalianou M,Orfanidis S,Katsaros C

更新日期：2016-03-01 00:00:00

abstract：:Pollen ontogeny in Pancratium maritimum L. was studied from the sporogenous cell to mature pollen grain stages using transmission electron, scanning electron, and light microscopy to determine whether the pollen development in P. maritimum follows the basic scheme in angiosperms or not. In the course of microsporogene...

journal_title：Protoplasma

authors： Tütüncü Konyar S

更新日期：2017-03-01 00:00:00

abstract：:Determinations of plant or algal cell density (cell mass divided by volume) have rarely accounted for the extracellular matrix or shrinkage during isolation. Three techniques were used to indirectly estimate the density of intact apical cells from protonemata of the moss Ceratodon purpureus. First, the volume fraction...

journal_title：Protoplasma

authors： Schwuchow JM,Kern VD,Wagner T,Sack FD

更新日期：2000-01-01 00:00:00

abstract：:Frost resistance of sprouting Picea abies shoots is insufficient for survival of naturally occurring late frosts. The cellular changes during sprouting appeared to be responsible for frost damage as frost events that damaged sprouting shoots did not damage older needles and stems. Whilst resting buds showed initial fr...

journal_title：Protoplasma

authors： Neuner G,Beikircher B

更新日期：2010-07-01 00:00:00

abstract：:The plant root tip represents a fascinating model system for studying changes in Golgi stack architecture associated with the developmental progression of meristematic cells to gravity sensing columella cells, and finally to "young" and "old", polysaccharide-slime secreting peripheral cells. To this end we have used ...

journal_title：Protoplasma

authors： Staehelin LA,Giddings TH Jr,Kiss JZ,Sack FD

更新日期：1990-01-01 00:00:00