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Download e-book for kindle: Hormonal Regulation of Development II: The Functions of by T. K. Scott (auth.), Professor Tom K. Scott (eds.)

By T. K. Scott (auth.), Professor Tom K. Scott (eds.)

ISBN-10: 3642677312

ISBN-13: 9783642677311

ISBN-10: 3642677339

ISBN-13: 9783642677335

This is the second one of the set of 3 volumes within the Encyclopedia of Plant body structure, New sequence, that might disguise the world of the hormonal law of plant progress and improvement. the general plan for the set assumes that this zone of plant body structure is satisfactorily mature for a evaluate of present knowl­ aspect to be prepared by way of unifying ideas and approaches. stories long ago have typically taken care of every one type of hormone separately, yet this set of volumes is subdivided in accordance with the homes universal to all periods. Such a company allows the exam of the speculation that differing sessions of hormones, performing in accordance with universal ideas, are determinants of strategies and levels in plant improvement. additionally based on this topic, a plant hormone is outlined as a compound with the homes held in universal by way of the local individuals of the famous periods of hormone. present wisdom of the hormonal legislation of plant improvement is grouped in order that the 3 volumes give some thought to advancing degrees of organizational complexity, viz: molecular and subcellular; cells, tissues, organs, and the plant as an equipped complete; and the plant on the subject of its environment.

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Hormonal Regulation of Development II: The Functions of by T. K. Scott (auth.), Professor Tom K. Scott (eds.) PDF

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Cytokinins stimulate ethylene production in wheat leaves (LOVEYS and WAREING 1971), pea stems (FUCHS and LIEBERMANN 1968) and mungbean hypocotyls (LAU and YANG 1976, IMASEKI et al. 1975). Since cytokinins increase the levels of free IAA, it is possible that the cytokinin effect on ethylene production is mediated by IAA. As noted earlier, ABA can interfere with auxin-induced ethylene biosynthesis in mungbean. ABA also inhibits ethylene production in rose petals (MAYAK and HALEVY 1972) and pea seedlings (GERTMAN and FUCHS 1972, LIEBERMANN and KUNISHI 1971).

Cytokinin deprivation of tobacco or sycamore cells in suspension culture temporarily induces partial synchronization of division beginning about 18 h after re-addition of the hormone (JOUANNEAU 1971, PEAUD-LENOEL and ]OUANNEAU 1971, ROBERTS and NORTH COTE 1970). This indicates that cytokinins may influence a specific regulatory point within the cell cycle. Perhaps the most likely point of cytokinin control of the cell cycle is in G 2 or the entry into mitosis from G 2 • Transfer of cultured soybean cells to cytokinin-free medium leads to cessation of division but not to DNA synthesis, so the amount of DNA per cell approximately doubles (SHORT et al.

Thus the response of particular cell types to hormones is strongly influenced by the recent history of exposure of the plant to environmental parameters. 4 Influence of Environmental Parameters on Endogenous Hormones Light, temperature, moisture content, etc. have strong effects on all phases of plant growth and development, and it is not surprising that these parameters influence the content of endogenous hormones. Some examples of environmental modification of hormone content are described below.

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Hormonal Regulation of Development II: The Functions of Hormones from the Level of the Cell to the Whole Plant by T. K. Scott (auth.), Professor Tom K. Scott (eds.)


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