New PDF release: Pattern Formation in Plant Tissues (Developmental and Cell

By Tsvi Sachs

ISBN-10: 0511574533

ISBN-13: 9780511574535

ISBN-10: 0521019311

ISBN-13: 9780521019316

ISBN-10: 0521248655

ISBN-13: 9780521248655

The chapters during this ebook are headquartered round the constitution of tissues, an intermediate and ignored point among overt morphology and biochemistry, and may be of serious curiosity to all these engaged in trying to comprehend the rules in the back of plant improvement. The author's goal is to foretell what could be sought for on a molecular point in an effort to account for observable types. every one bankruptcy offers with an outlined challenge resembling the function of hormones as correlative brokers, tissue polarization, apical meristems and cellphone lineages. the ultimate bankruptcy develops an alternate method of the matter of the specification of organic shape, that of "epigenetic selection."

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Additional resources for Pattern Formation in Plant Tissues (Developmental and Cell Biology Series)

Sample text

A. Callus development on a cut surface of a bean hypocotyl about 10 days after it was wounded. The hypocotyl was cut from the shoot and the roots but left in contact with the cotyledons. It was kept in a moist atmosphere in unsterile conditions. B. Callus surrounding a cut where a large branch was removed from a poplar tree. There is considerable organization within such callus. C. A large tumor on a Schinus molle tree. The cause of these tumors is unknown, but they often form where the trees have been wounded.

Though the cellular heterogeneity found in callus is not invariable, it is definitely found in many tumors, both on plants and in culture (Noel, 1946). Stable or determined differentiation of callus cells is expressed also in the dependence of their traits on the tissue from which the callus originated (Heslop-Harrison, 1967; Murashige, 1974; Wareing, 1978; Meins, 1983, 1986; Wareing and Al-Chalabi, 1985). This dependence of callus traits is found not only for callus originating in different organs but also for different degrees of the juvenility to maturity gradient along shoots (Chapter 12).

These effects are specific to auxin, but they may be increased or modified by various additives (Hejnowicz and Tomaszewski, 1969; Lachaud, 1983). Thus, auxin prevents plagiogeotropic branches from turning upwards (Snow, 1945) and, when applied together with gibberellins, induces stolon growth in the lower buds of potato plants (Woolley and Wareing, 1972). Local exogenous auxin also induces and orients all aspects of vascular differentiation, with the possible exception of the early procambium 28 Hormones as correlative agents (Young, 1954) and the formation of some fibers and tracheids (Savidge and Wareing, 1981; Aloni, 1987b, Chapter 6).

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Pattern Formation in Plant Tissues (Developmental and Cell Biology Series) by Tsvi Sachs


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