Maize coleoptiles

Kim, J-B., Caipita, N.C. (1992), Changes in esterification of the uronic acid groups of cell wall polysaccharides during elongation of maize coleoptiles. Plant Physiol. 98, 646-653. 

Mitochondria from cucumber roots, pea (Plsum sativum L.) roots, and maize coleoptiles reacted in a manner similar to mitochondria from cucumber hypocotyls. Hence, it appears that various allelochemlcals can produce different effects on ATP production. 

Ray PM. Maize coleoptile cellular membranes bearing different types of glucan synthetase activity, in Plant Organelles (Reid E, ed.), Ellis Horwood, Chichester, UK, 1979, pp. 135-158. 

There have been few studies of polymer interconnections within the primary wall of monocots. An arabinoxylan from the primary wall of cultured, barley-aleurone cells,61 and a glucuronoarabinoxylan from maize-coleoptile primary-wall,200 have been shown to bind reversibly to cellulose in vitro, Because xylans are, quantitatively, the major component of monocot primary cell-walls, this interconnection is an important finding it is very likely to occur through multiple hydrogen-bonds, analogous to the interconnection between xyloglucan and cellulose in dicot cell-walls.56,57,59 It is also possible that heteroxylans participate in binding other cell-wall polymers to cellulose. 

Carpita, N.C. 1984. Cell wall development in maize coleoptiles. Plant Physiol. 76 205-212. 

Abscisic acid is a negative regulator in that it primarily antagonizes the action of cytokinins, auxins, and in particular, gibberellins. Abscisic acid decreased the activity of polymerase in radishes (52), peas (53), maize coleoptiles (54), and pear embryos (55). More detailed studies are needed before the question of ABA-induced "modification" of RNA polymerase (54) or "alterations" in the number of sites for template activity (56) can be answered. In barley aleurone cells, ABA-induced suppression of GA-induced <-amylase formation was presumed to involve the continuous synthesis of a short-lived RNA (57). 

Aldehyde oxidase purified from maize coleoptiles is a multicomponent enzyme that contains a molybdenum cofactor, nonheme iron, and flavin adenine dinucleotide (FAD) as prosthetic groups.111 When substrate specificity of the aldehyde oxidase was tested, good activity was detected with IAAld, indole-3-aldehyde, and benzaldehyde among others. The addition of NADP and NADPH did not change the activity. In contrast, in maize endosperm, tryptophan-dependent IAA biosynthesis was dependent on an NADP/NADPH redox system, which may mean that the two tissues of maize are utilizing different pathways or different redox systems for IAA biosynthesis.112... 

Cell wall architecture of elongating maize coleoptile. Plant Physiol, 127, 557-55. 

The small G-proteins ypt-m, and ypt-m2 [116] showed expression patterns distinct from each other, ypt-m, was only weakly expressed in maize coleoptiles, whilst ypt-m2 showed low levels in roots, leaves and coleoptiles and high levels of expression in floral tissues. By comparison, Rhal was most highly expressed in root, weakly in stems and floral tissue... 

There is considerable evidence indicating that some of the wall components are unstable and, after they are formed, change by turnover, autolysis, or degradation. It has been reported that isolated cell-walls from oat and maize coleoptiles contain polysaccharidedegrading enzymes that are firmly bound. ... 

The precise mode of PCIB action in Funaria is unknown as yet. In the rhizoids, 10 pM PCIB reduces the polar, basipetal transport to about 40% of the control [20]. In maize coleoptiles and Cucurbita hypocotyls, PCIB specifically competes with lAA for lAA-binding sites in vitro [8, 10]. The delay in caulonema production by... 

Zucchini hypocotyls (Cucurbitapepo, var. All Green Bush) were grown for 5 days in the dark at 25 C or 7 days in white light (14 h/day) maize coleoptiles Zea mays var. Caldera 535) were grown for 5 days in the dark pea plants (Pisum sativum var. Alderman, a kind gift of Dr D.A. Morris) were grown in the light for 21 days and second internodes harvested for use. 

Goldsmith MHM (1982) A saturable site responsible for polar transport of indole-3-acetic acid in sections of maize coleoptiles. Planta 155 68-75 Goldsmith MHM, Goldsmith TH (1981) Quantitative predictions for the chemiosmotic uptake of auxin. Planta 153 25-33... 

Lavender DP, Sweet GB, Zaerr JB, Hermann RK (1973) Spring shoot growth in Douglas-flr may be initiated by gibberellins exported from the roots. Science 182 838-839 Lembi CA, Morre DJ, Thomson KSt, Hertel R (1971) 1-N-naphthylphthalamic-acid (NPA)-binding activity of a plasma membrane-rich fraction from maize coleoptiles. Planta 99 37-45... 

Ray PM (1958) Destruction of auxin. Annu Rev Plant Physiol 9 81-118 Ray PM, Dohrmann U, Hertel R (1977) Characterization of naphthaleneacetic acid binding to receptor sites on cellular membranes of maize coleoptile tissue. Plant Physiol 59 357-364... 

Chicha A., Justin A.-M., Jolliot A., Demandre C., Mazliak P. Biosynthesis of the molecular species of phosphatidylinositol found in microsomes and plasma membranes from etiolated maize coleoptiles. Plant Physiol Biochem.y 1993 31 507-513. 

---