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    Wyświetlanie 1-2 z 2
    Tytuł:
    Phyllotaxis instability - exploring the depths of first available space
    Autorzy:
    Szpak, M.
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/56528.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phyllotaxis
    instability
    depth
    available space
    phyllotactic transition
    shoot apical meristem
    plant
    ontogenesis
    Opis:
    The theoretical analysis of the consequences of the phyllotactic pattern being propagated according to the first available space rule has revealed that all monojugate patterns, with the exception of the main Fibonacci pattern, should become developmentally unstable in their low expressions. This fact explains why the main Fibonacci pattern plays the dominant role among other patterns of spiral phyllotaxis. The probability that the pattern becomes unstable varies for different patterns, which likely makes them more or less frequent, and thus easier or more difficult to encounter in nature. The unstable pattern inevitably transforms into another, as the computer simulations show. Theoretically predicted instability of low order phyllotaxis may be treated as one of the causes of natural ontogenetic transitions, occurring in plants. This, however, still does not explain why in nature some patterns with high order of phyllotaxis also change, quite readily one into the other, in shoot apical meristem’s ontogeny.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signals flowing from mature tissues to shoot apical meristem affect phyllotaxis in coniferous shoot
    Autorzy:
    Banasiak, A
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/57096.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    mature tissue
    shoot
    apical meristem
    phyllotaxis
    coniferous plant
    auxin
    vascular system
    leaf
    primordium
    Opis:
    Axial homodromy in growing shoots of perennial plants with spiral phyllotaxis is the case when the chirality of phyllotactic pattern does not change in consecutive growth increments of the same axis. In conifers such as Picea or Abies this rule is strictly observed, except for the rare cases of discontinuous phyllotactic transitions. In Torreya, however, the chirality changes, at random, every year. The pattern of primordia packing, executed by vegetative shoot apical meristem (SAM), depends in Torreya on their identity. The primordia of bud scales are initiated in the decussate and those of needles in bijugate spiral pattern. The decussate, achiral i.e. neutral pattern always precedes the formation of new spiral pattern and thus facilitates random selection of its chiral configuration. Periodic change in organ identity cannot itself be responsible for the special behavior of Torreya, because in other conifers it also exists. There is, however, one important difference: in Torreya, when the initiation of bud scales begins at SAM, the distance between differentiated protoxylem and the initiation site gradually increases, while in other conifers it remains constant and small. In Torreya, at this phase of development, the rate of xylem differentiation and the rate of organogenesis become uncoupled. Closer anatomical examination shows that the decussate pattern in a bud scale zone develops slowly suggesting gradual decrease of the putative signal flowing acropetally from differentiated protoxylem, responsible for positioning of primordia. We hypothesize that in the absence of this signal SAM starts acting autonomously, distributing primordia according to their identity only. A constant presence of the signal in other conifers assures the continuation of the same phyllotactic pattern throughout the period of bud scale formation, despite the change in organ identity.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2006, 75, 2; 113-121
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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