Differentiation xylem

BolweU, G.P., Dalessandro, G., and Northcote, D.H. (1985) Decrease of polygalacturonic acid synthase during xylem differentiation in sycamore. Phytochemistry, 24 699-702. [Pg.122]

D Alessandro, G. and Northcote, D.H., Changes in enzymic activities of UDP-D-glucuronate decarboxylase and UDP-D-xylose 4-epimerase during cell division and xylem differentiation in cultured explants of Jerusalem artichoke, Phytochemistry, 16, 853-859, 1977. [Pg.349]

Figure 6. Effect of Brassinolide on Xylem Differentiation in Helianthus tuberosus. Explants were harvested 24, 48 or 72 hours after incubation on xylogenic medium (23) with (open bars) or without (closed bars) 68 nM BR.

Markland, W., Haddon, L. 1982. An improved technique for the culture of Jerusalem Artichoke (Helianthus tuberosus L.) explants for use in study of xylem differentiation. Plant Cell Reports 1 229-231. [Pg.140]

There is further evidence to support the claim that brassinosteroids are hormonal in their action (6). These are the effects of brassinolide on gravitropism (7), effects in conjunction with light quality (8), effects on photosynthate partitioning (9), probable effects on phytochrome (10), substitution for indole-3-acetic acid in soybean epicotyls (11), enhancement of xylem differentiation (11), stimulation of membrane permeability in cucumber hypocotyls (12), and stimulation of ATPase activity (12). Taken objectively, many of these specific physiological and biochemical functions which are attributed to brassinolide, and by inference to the brassinosteroids in general, have been attributed to the other plant hormones, especially indole-3-acetic acid and the gibberellins (6, 13). [Pg.334]

Both stem cell elongation and xylem differentiation are auxin-mediated processes. There has long been speculation that BRs act through alterations in the auxin response [109]. This is certainly not always the case, as BR induces elongation of soybean hypocotyls without activating any of the auxin-induced genes such as the SAUR genes [112]. On the other hand, one of the effects of BR in tomato hypocotyls appears to be to increase the sensitivity of the tissue to auxin [113]. Thus some BR effects may actually be mediated via auxin, while others are independent of auxin. [Pg.19]

Polysaccharide consisting of ( - 4)- -d-(3alpA-(l - 2)-a-L-Rhap-(l - ) backbone with arabinan and oligogalactosyl side-groups attached at 0-4 of the Rha residues. Interspecies variation is prob. due to side-chain variation. Isol. from xylem-differentiating zones of Crypto-meria japonica and from sycamore Acer pseudoplatanus). Major pectic polysaccharide component of cell walls of dicots and nongraminaceous monocots. [Pg.834]

Hormones and Cuscuta Development Influence of Hormones on Secondary Xylem Differentiation, Phenylalanine Ammonia Lyase (PAL) Activity and Ligniflcation... [Pg.492]

Since new secondary cell wall formation accompanies lignin deposition during secondary xylem differentiation, the possibility exists that GA3 or BA + GA3 enhanced lignification by enhancing amylase activity for starch mobilization. Preliminary experiments (Table 6) showed, contrary to expectation, that all the hormones GA3, BA and NAA, singly or in combination, actually suppressed the enormous (56-fold increase) a-amylase induction that occurs in untreated control segments. The increased amylase activity seen in control segments after 48 h was... [Pg.500]

Fosket DE (1970) The time course of xylem differentiation and its relation to deoxyribonucleic acid synthesis in cultured Coleus stem segments. Plant Physiol 46 64—68 Gautheret RJ (1959) La culture des tissues vegetaux. Masson et Cie, Paris Gee H (1972) Localization and uptake of " C-IAA in relation to xylem regeneration in Coleus internodes. Planta 108 1-9... [Pg.168]

Hess T, Sachs T (1972) The influence of a mature leaf on xylem differentiation. New Phytol 71 903-914... [Pg.168]

Odhnoff C (1963) The effect of gibberellin and phenylboric acid on xylem differentiation and epidermal cell elongation in bean roots. Physiol Plant 16 474-483... [Pg.169]

Shininger TL (1971) The regulation of cambial division and secondary xylem differentiation in Xanthium by auxins and gibberellin. Plant Physiol 47 417-422 Shininger TL (1979) The control of vascular development. Annu Rev Plant Physiol 30 313-337... [Pg.170]

Sorokin HP, Mathur SN, Thimann KV (1962) The effects of auxins and kinetin on xylem differentiation in the pea epicotyl. Am J Bot 49 444-453 Stant MY (1961) The effect of gibberellic acid on fibre-cell length. Ann Bot 25 453-462 Stant MY (1963) The effect of gibberellic acid on cell width and the cell wall of some phloem fibers. Ann Bot 27 185-196... [Pg.170]

Wareing PF, Hanney CEA, Digby J (1964) The role of endogenous hormones in cambial activity and xylem differentiation. In Zimmermann MH (ed) The formation of wood in forest trees. Academic Press, London New York, pp 323-344 Wetmore RH, Rier JP (1963) Experimental induction of vascular tissues in callus of angiosperms. Am J Bot 50 418-430... [Pg.171]

Wodzicki TJ (1971) Mechanism of xylem differentiation in Firms silvestris L. J Exp Bot 22 670-687... [Pg.261]

Genetic controls over extracellular nitrogenous compounds are seen in 1) cell-to-cell recognition in situ and in vitro (19, 20, 45), 2) specific and nonspecific responses to insects and disease (101), and 3) xylem differentiation. In the latter, genetics and metabolism interact to provide regulatory and feed-back systems and an environmental sensing apparatus (9). [Pg.189]

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