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  • Angiosperms
  • Springer  (15)
  • Springer Nature
  • 1995-1999  (15)
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  • Springer  (15)
  • Springer Nature
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The evolution of angiosperm seed proteins: A methionine-rich legumin subfamily present in lower angiosperm Clades (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 399-404 
    Details
    ISSN: 1432-1432
    Keywords: Asarum ; Dioscorea ; Angiosperms ; Evolution ; Legumins ; Seed proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Analysis of legumin-encoding cDNAs fromDioscorea caucasica Lipsky (Dioscoreaceae) and fromAsarum europaeum L. (Aristolochiaceae) shows that there is an especially methionine-rich legumin subfamily present in the lower angiosperm clades including the Monocotyledoneae. It is characterized by a methionine content of 3–4 mol% which is roughly triple the methionine proportion of most other legumins. These “MetR” legumins, if present, still have to be detected in the higher angiosperms including the important seed crops. Evolutionary analysis suggests that the MetR legumins are the result of a gene duplication allowing the differentiation of legumin genes according to their sulfur content. The duplication event must have taken place before the split into mono- and dicotyledonous plants but probably after the separation of angiosperms and gymnosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02339013
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of the male germ unit: organization and function in tobacco (Nicotiana tabacum L.) (1998)
    Springer
    Plant cell reports 18 (1998), S. 143-147 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsNicotiana tabacum ; Male germ unit ; Scanning electron microscopy ; Sperm isolation ; Angiosperms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sperm cells are released from pollen tubes of tobacco as linked cells, associated with the vegetative nucleus in an assemblage known as the male germ unit (MGU). Using light microscopy, the MGU assemblage appears to be ensheathed by cytoplasmic material of the pollen tube, which may stabilize their association. Following their release, the shape of the sperm cells and vegetative nucleus changes from an ellipsoidal to a more spheroidal morphology. When most of the cytoplasmic material is dispersed, a boundary remains around the two sperm cells. Using scanning electron microscopy, the cytoplasmic material surrounding the MGU appears filamentous, sometimes twisted and rope-like. Based on these observations, the function of the MGU of tobacco is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050547
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  • 3
    Electronic Resource
    Electronic Resource
    Notes on the colour of pollen (1995)
    Springer
    Plant systematics and evolution 198 (1995), S. 235-252 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Pollen ; pollen colour ; pollen signal ; spectral reflection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spectral reflection of pollen in 67 plant species out of 28 families was measured by means of mass recording of pollen grains. Various types of spectral reflection curves were found, but 75% belonged to two categories: 1. Human-yellow pollen with strong reflection in the green and red, and low reflection in the ultraviolet and blue range of wavelengths. 2. Human-whitish pollen with strong reflection in the green and red and additional reflection of shorter wavelengths. It is shown that it is important to have information about the mode of the visual pollen display — crypsis or colour contrast against the corolla, pollen advertisement, or concealment — and the visual capabilities of the presumed pollinators in order to be able to discuss the signalling function of pollen colours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984739
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  • 4
    Electronic Resource
    Electronic Resource
    Organogenetic capacity of leaves: The significance of marginal blastozones in angiosperms (1996)
    Springer
    Plant systematics and evolution 199 (1996), S. 121-152 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Leaf development ; organismal approach ; blastozone ; organogenetic competence ; primary morphogenesis ; marginal meristems ; topography ; eumeristem ; cytohistological gradients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new term — the “blastozone” — is proposed to designate regions of the shoot competent for organogenesis. It is argued that the notion of “marginal meristems” is based on the cell theory and thus may not be appropriate to elucidate the process of organ formation. For instance, with respect to the occurrence of initials and of an elevated cell division rate marginal meristems have been shown to be doubtful structures. Furthermore, organogenetic competent regions form only parts of the meristems of the shoot. The study of blastozones from an organismic perspective reveals primary morphogenetic events such as initiation, incorporation, and fusion processes. Loss of morphogenetic competence is associated with histogenetic events, e.g., trichome outgrowth, and indicates the onset of processes leading to maturation. The marginal blastozone of the leaf is then used up although meristem features continue to be expressed. A series of SEM studies in several genera exemplifies the proposed viewpoint, demonstrating some of the morphogenetic potentialities of angiosperm leaf marginal blastozones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984901
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  • 5
    Electronic Resource
    Electronic Resource
    Reproductive biology ofCaesalpinia calycina andC. pluviosa (Leguminosae) of the caatinga of north-eastern Brazil (1999)
    Springer
    Plant systematics and evolution 217 (1999), S. 43-53 
    Details
    ISSN: 1615-6110
    Keywords: Leguminosae ; Caesalpinia ; Angiosperms ; bee-pollination ; andromonoecy ; late-acting self-incompatibility ; fruiting success
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The pollination biology, breeding system and fruiting success ofCaesalpinia calycina andC. pluviosa var.sanfranciscana were studied in caatinga vegetation in Bahia, NE Brazil. The principal pollinators for both species were carpenter bees.Caesalpinia calycina is andromonoecious but inC. pluviosa all flowers are hermaphrodite. InC. calycina all selfed flowers were abscised within 72 h despite rapid self-pollen tube growth to the ovary and ovule penetration. Prevention of selfing therefore seems to be controlled by a post-zygotic mechanism. Both species had very low fruit-set and it is suggested that this is at least in part due to geitonogamous pollinations with ovule penetration by self pollen tubes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984921
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  • 6
    Electronic Resource
    Electronic Resource
    Emerging data on pollen tube growth and fertilization in flowering plants, 1990–1995 (1996)
    Springer
    Protoplasma 193 (1996), S. 132-143 
    Details
    ISSN: 1615-6102
    Keywords: Fertilization ; Pollen tube ; Embryo sac ; Gametes ; Angiosperms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Since its discovery at the end of the last century, double fertilization remains of central interest in plant reproductive biology research. Although the sequence of events leading to fertilization is well known from cytological studies, the underlying mechanisms remain to be elucidated. This now seems feasible by the diversification and refinement of recently developed technologies presented in this review. The progress made during the last five years in understanding pollen tube guidance, discharge into the embryo sac, and gametic fusion are described. Future directions are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276641
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  • 7
    Electronic Resource
    Electronic Resource
    Unidirectionality of floral colour changes (1996)
    Springer
    Plant systematics and evolution 200 (1996), S. 125-140 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Colour change ; floral colour phase ; innate flower detection ; colour preference ; pollination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Many angiosperms have arranged their flowers in inflorescences forming a distinct signalling unit to flower visitors. In some species, the flowers of inflorescences undergo a temporal colour change corresponding exactly to a change in the reward status. Based on information obtained from the spectral reflection curves of pre-change and postchage colours of flower corollas and/or floral guides, it was possible to demonstrate that the colour phase associated with reward closely corresponds to the visual stimuli which trigger behavioural responses of inexperienced flower visitors, and that the colour phase associated with less reward corresponds to visual stimuli less attractive to naïve flower visitors. Reciprocal colour changes were not observed. It is to be assumed that the unidirectionality of floral colour changes is an adaptation of angiosperms aimed at the guidance of first-time flower visitors. Signalling reward to inexperienced flower visitors is an additional function of floral colour changes. The main function of floral colour changes, however, is to provide cues with which the flower visitors can learn to associate one colour phase with reward.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984753
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  • 8
    Electronic Resource
    Electronic Resource
    Magnoliid reproductive organs from the Cenomanian-Turonian of north-western Kazakhstan:Magnoliaceae andIlliciaceae (1999)
    Springer
    Plant systematics and evolution 216 (1999), S. 265-288 
    Details
    ISSN: 1615-6110
    Keywords: Illiciaceae ; Illiciospermum ; Liriodendroidea ; Magnoliaceae ; Angiosperms ; Cretaceous ; fossil seeds ; Kazakhstan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cenomanian-Turonian sediments from the Sarbay locality in north-western Kazakhstan have yielded a rich assemblage of plant fossils including well preserved flowers, fruits, and seeds of angiosperms. This work describes fossil seeds assigned to theMagnoliaceae and theIlliciaceae. Three new species of the extinct magnoliaceous genusLiriodendroidea, L. asiatica, L. costata, andL. tenuitesta, are established and new information on the previously described species,L. alata, is provided. TheLiriodendroidea seeds are closely similar to seeds of extantLiriodendron, but are distinguished in being much smaller and winged. A new genus and species,Illiciospermum pusillum, is established based on seeds with close similarity to those of the extant genusIllicium. The seeds are small, anatropous and exotestal with outer epidermis of testa forming a palisade layer. The facets of the palisade cells have deeply undulate anticlinal walls. The micropyle area is seen on the outer integument as a transverse slit placed on a raised strophiole-like structure close to the hilum. TheIlliciospermum seeds represent the first unequivocal record of theIlliciaceae in the Cretaceous. Another seed of possible illiciaceous affinity is described as aff.Illiciospermum sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01084403
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  • 9
    Electronic Resource
    Electronic Resource
    Allozyme divergence among species ofWolffia (Lemnaceae) (1995)
    Springer
    Plant systematics and evolution 197 (1995), S. 59-69 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Lemnaceae ; Wolffia ; Allozymes ; genetic divergence ; electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genusWolffia was surveyed electrophoretically at 14 allozyme loci. A total of 133 clones representing 10 of the 11 recognized species was examined. Genetic identities among most pairs of species are zero, with non-zero values ranging from 0.14 to 0.40.Wolffia angusta and the newly describedW. neglecta show the highest similarity, and the former species has an identity of 0.14 withW. australiana. The next highest similarity (0.34) occurs betweenW. globosa of Southeast Asia andW. cylindracea of southern Africa, which until recently, had generally been viewed as members of the same species. Other species showing some common alleles are members of a complex involvingW. arrhiza, W. columbiana, W. cylindracea, andW. globosa. WithinW. arrhiza, plants from South Africa and Europe are easily distinguished electrophoretically because each contains unique alleles at two loci. Strains from other parts of Africa vary at these loci and are not totally distinct from either the plants from South Africa or from Europe. Species ofWolffia are much more divergent at allozyme loci than the majority of congeners of flowering plants. This suggests that the species are quite old and that the difficulties in distinguishing taxa morphologically are the result of reduction rather than lack of divergence due to recent speciation. Because of the lack of shared alleles between the majority of species pairs inWolffia, enzyme electrophoresis provides limited resolution of species relationships in the genus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984632
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  • 10
    Electronic Resource
    Electronic Resource
    Telomere sequence localization and karyotype evolution in higher plants (1995)
    Springer
    Plant systematics and evolution 196 (1995), S. 227-241 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; gymnosperms ; bryophytes ; Telomeres ; fluorescent in situ hybridization ; karyotype evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data for chromosomal localization of theArabidopsis-type of telomeric sequence repeats (TTTAGGG)n are compiled for 44 species belonging to 14 families of angiosperms, gymnosperms and bryophytes. For 23 species and seven families this is the first report. Species of all families, except theAlliaceae, revealed these sequences at their chromosome termini. This indicates thatArabidopsis-type telomeric repeats are highly conserved. It is inferred that they represent the basic telomere sequence of higher plant phyla. In theAlliaceae, a deviating sequence (and mechanism?) for the stabilization of chromosome termini has possibly evolved secondarily. Nine species revealed interstitial telomeric sequences in addition to the terminal ones, in three species (Vicia faba, Pinus elliottii, P. sylvestris) also at centromeric positions. Interstitial telomeric sequences may indicate karyotype reconstructions, in particular alterations of chromosome numbers by chromosome fusion — or inversions with one breakpoint within the terminal array of repeats. They may contribute to stabilization of chromosome breaks, especially centric fissions, and increase the frequency of meiotic and illegitimate recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982962
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