Plants are multicellular eukaryotes with tissue systems made of various cell types that carry out specific functions. Plant tissue systems fall into one of two general types: meristematic tissue and permanent (or non-meristematic) tissue. Cells of the meristematic tissue are found inmeristems, which...
1999. The cytoplast concept in dividing plant cells: cytoplasmic domains and the evolution of spatially organized cell division. American Journal of Botany 86: 153±172.Pickett-Heaps JD, Gunning BES, Brown RC, Lemmon BE, Cleary AL. 1999. The cytoplast concept in dividing plant cells: ...
The unique cytokinetic apparatus of higher plant cells comprises two cytoskeletal systems: a predictive preprophase band of microtubules (MTs), which defines the future division site, and the phragmoplast, which mediates crosswall formation after mitosis. We review features of plant cell division in...
(Fig. 1-18). In time, these plantlets fall off the leaf and establish themselves as new plants. InBryophyllum,groups of cells at leaf margins are left undifferentiated to produce these plantlets; in others, seemingly mature cells at leaf margins or leaf surface resume meristematic activity ...
While some of the cells of the apical meristem divide to generate new meristematic cells, most of the offspring cells differentiate into specialized cell types that stop dividing and function as a part of the organ in which they were generated. Meristems and Simple Plant Growth Plants have ...
Plantorganogenesisis assured by pools of dividing, pluripotent cells that reside in themeristems, the plant'sstem cell niches. The shoot apicalmeristem(SAM), a group of cells at the growing tip of a plant, generates all the above-ground tissues of the plant. TheSAMis organized into a centr...
The large derivative stops dividing and differentiates as an unspecialized epidermal cell, while the small derivative undergoes another asymmetric division. At an unknown stop signal, the small derivative undergoes a symmetric division, giving rise to two equal sized cells that become the guard cells....
that in N2mut, leading to a tighter arrangement of the cell wall with nearly no crack in the endosperm. However, the starch granules were round, smooth which is different from that in WT (Fig3c). As in the normal control, the parenchyma cells of the WT were almost flat, and the ...
Other viruses using polyprotein processing have additional devices that can avoid this problem. Comoviruses have their two CPs on a separate genome segment (Section V, G). There does not appear to be any massive accumulation of non-coat gene products in cells infected with these viruses. b ...
Cytokinins were discovered as a result of efforts to identify factors that would stimulate mature, nondividing plant cells to proliferate in tissue culture. Initially, Folke Skoog at the University of Wisconsin found a synthetic adenine derivative he namedkinetin(Fig. 6.23) that was a powerful stimu...