Abscisic acid division

While other plant studies were conducted relative to other morphological observations and interactions with exogenously applied plant growth regulators such as indole-3-acetic acid and abscisic acid, the major message was that CB influenced cytoplasmic streaming, but not cell division perse, in plants. 

Minocha, S.C., Abscisic acid promotion of cell division and DNA synthesis in Jerusalem artichoke tuber tissue cultured in vitro, Z. Pflanzenphysiol., 92, 327-339, 1979. 

At times when a plant needs to slow down growth and assume a resting stage (dormant), abscisic acid is produced in the terminal bud, which slows down growth and directs the leaf primordia to develop scales that protect the dormant bud during winter. Since the hormone also inhibits cell division in the vascular cambium, both primary and secondary growth is put on hold during winter. 

Growth inhibitors like abscisic acid (dormin) and abscisin II retard growth, promote abscission, and induce dormancy. They were discovered in the 1960s [18]. They directly affect cell division and expansion and induce stomatal closure [8]. 

Every one of these assignations of hormonal functions has major exceptions and qualifications. Auxins alone may not account for cell enlargement, and gibberellin alone does not control stem growth (Cleland 1964). Cytokinin alone does not appear to induce cell division even in the standard cell division tests the assay for cytokinins requires the presence of another hormone, auxin (Skoog and Miller 1957, Steward and Shantz 1959) abscisic acid itself does not adequately account for the control of either abscission (Craker and Abeles... 

There are few specific studies of the effects of gibberellins, ethylene, abscisic acid, and other growth regulators on the cell cycle. While these substances have effects on division in some instances, evidence connecting these effects to specific steps of the cell cycle is generally lacking. 

Abscisic Acid. ABA is a potent inhibitor of cell division in the developing roots of Lemna minor (Newton 1977). This effect, plus an apparent direct inhibitory effect on cell expansion in Lemna roots, contributes to the overall inhibitory action of ABA on root elongation in this aquatic plant. 

II. Inhibition of cell division. Am J Bot 59 450-457 El-Antably HMM, Larsen P (1974) Distribution of gibberellins and abscisic acid in geo-tropically stimulated Vida faba roots. Physiol Plant 32 322-329 Eliasson L (1969) Growth regulators of Populus tremula, I. Distribution of auxin and growth inhibitors. Physiol Plant 22 1288-1301 Eliasson L (1975) Effect of indoleacetic acid on the abscisic acid level in stem tissue. Physiol Plant 34 117-120... 

Letham DS (1971) Regulators of cell division in plant tissues. XII. A cytokinin bioassay using excised radish cotyledons. Physiol Plant 25 391-396 Libbenga KR, Xorrey JG (1973) Hormone-induced endoreduplication prior to mitosis in cultured pea root cortex cells. Am J Bot 60 293-299 Lieberman M, Kunishi AX (1971) Abscisic acid and ethylene production. Plant Physiol 47, Suppl, p 22... 

Rappaport L (1979) Does GA3 regulate cell division Plant Physiol 63 Suppl, p 32 Rauser WE, Horton RF (1975) Rapid effects of indoleacetic acid and ethylene on the growth of intact pea roots. Plant Physiol 55 443-447 Rehm MM, Cline MG (1973) Rapid growth inhibition of Avena coleoptile segments by abscisic acid. Plant Physiol 51 93-96... 

Letham DS (1967) Regulators of cell division in plant tissues. V. A comparison of the activities of zeatin and other cytokinins in five bioassays. Planta 74 228-242 Little CHA, Heald JK, Browning G (1978) Identification and measurement of indoleacetic and abscisic acids in the cambial region by combined gas chromatography-mass spectrometry. Planta 139 133-138... 

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