المؤلفون: Kiss JZ; Department of Botany, Miami University, Oxford, OH 45056, USA. kissjz@muohio.edu

المصدر: Critical reviews in plant sciences [CRC Crit Rev Plant Sci] 2000; Vol. 19 (6), pp. 551-73.

نوع المنشور: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.; Review

بيانات الدورية: Publisher: CRC Press Country of Publication: United States NLM ID: 9889759 Publication Model: Print Cited Medium: Print ISSN: 0735-2689 (Print) Linking ISSN: 07352689 NLM ISO Abbreviation: CRC Crit Rev Plant Sci

مواضيع طبية MeSH: Gravitation* , Plant Development*, Gravitropism/*physiology , Gravity Sensing/*physiology , Signal Transduction/*physiology, Plant Cells ; Plant Physiological Phenomena ; Plants/ultrastructure ; Plastids/physiology ; Protoplasts/physiology ; Space Flight ; Weightlessness

مستخلص: Gravitropism is directed growth of a plant or plant organ in response to gravity and can be divided into the following temporal sequence: perception, transduction, and response. This article is a review of the research on the early events of gravitropism (i.e., phenomena associated with the perception and transduction phases). The two major hypotheses for graviperception are the protoplast-pressure and starch-statolith models. While most researchers support the concept of statoliths, there are suggestions that plants have multiple mechanisms of perception. Evidence supports the hypothesis that the actin cytoskeleton is involved in graviperception/transduction, but the details of these mechanisms remain elusive. A number of recent developments, such as increased use of the molecular genetic approach, magnetophoresis, and laser ablation, have facilitated research in graviperception and have allowed for refinement of the current models. In addition, the entire continuum of acceleration forces from hypo- to hyper-gravity have been useful in studying perception mechanisms. Future interdisciplinary molecular approaches and the availability of sophisticated laboratories on the International Space Station should help to develop new insights into mechanisms of gravitropism in plants.

الوصف: Better validation of indigenous domestic animal genetic resources is becoming more important with regard to the potential of livestock for poverty alleviation and income generation. To improve indigenous breeds for sustainable income and employment generation, the methods to be employed are the same as developed in systematic breeding programs, be it for cross-breeding or selective breeding within a specific breed. This book systematically introduces the reader to the breed improvement theory and illustrates the theory with practical examples and case studies. The book is addressed to animal science teachers, to undergraduate and postgraduate students as well as to decision makers in the state and central livestock departments.

المؤلفون: D Lalithakumari

نوع المادة: eBook.

الموضوعات: Fungal protoplasts, Fungi--Cytochemistry, Fungi--Biotechnology

تصنيفات: SCIENCE / Life Sciences / Botany, SCIENCE / Life Sciences / General