PPT-Concept 39.2: Plant hormones help coordinate growth, develo

Plant hormones are chemical signals that modify or control one or more specific physiological processes within a plant 2011 Pearson Education Inc The Discovery of Plant Hormones Any response resulting in curvature of organs toward or away from a stimulus is called a . continued. Water. Plants require water for growth, temperature regulation, and for support. . Remember . that water is one of the reactants needed for photosynthesis. A plant that does not have sufficient amounts of water will wilt. . Tropisms. Uses of plant hormones. How do plants always grow the right way up?. What conditions will affect how a plant grows?. Plants are very sensitive and their growth is affected by . their environmental conditions.. Plant Responses to Internal and External Signals. Concept 39.1. Concept 39.1. Concept 39.1. Messages are sent by hormones through a signal-transduction pathway. - a hormone binds to a specific receptor on the cell wall. Plant Hormones. Plant Hormones. Naturally occurring compounds produced by the plant to accelerate or inhibit the rate of growth or maturation. Produced in minute quantities, but can have a large affect on growth. Plants adapt their growth to environmental conditions. Undifferentiated cells. Undifferentiated cells in the meristems of plants allow indeterminate growth. .. Meristems are tissues in a plant consisting of undifferentiated cells capable of indeterminate growth. . . Growth Retardants. . Synthetic and natural growth retardants are sold under the trade names A-Rest. ®. , B-Nine. ®. , Bonzi. ®. , Sumagic. ®. , Cycocel. ®. , and others.. Used on florist crops such as poinsettia & chrysanthemum.. Plant Hormones. Hormones are chemical signals that coordinate the various parts of an organism. A hormone is a compound produced in one part of the body which is then transported to other parts of the body, where it triggers responses in target cells and tissues. Why? We love plants. 9.3 Growth in plants. Nature . of science: . Developments . in scientific research follow improvements in analysis and deduction—improvements in analytical techniques allowing the detection of trace amounts of substances has led to advances in the understanding of plant hormones and their effect on gene expression. (1.8. Define plant hormones. Outline some of the effects of plant hormones. Explain some of the observations when carrying out experiments into plant hormones. Give examples of how they are used in food production. Fig. 32-1a, p.540. Impacts, Issues: . . Foolish Seedlings, Gorgeous Grapes. . . Hormones – signaling molecules that stimulate or inhibit gene activity. Gibberellins are a class of plant hormones that stimulate stem lengthening. Plant Growth and Development. Hormones . diffuse throughout the plant to promote growth and development.. What is a Plant Hormone?. A . naturally-occurring. compound which regulates change in . physiology. DEPARTMENT OF MICROBIOLOGY. Course : . B.Sc. , Year: I, Semester : . II, . Sub. Code: 16SACBC2. Course Material on:. Prepared by . . . Dr. R. . Krishnaveni. , . M.Sc., M.Phil., M.Phil.,. B.Ed. Dr. Anju Singh. Assistant Professor . School of Pharmaceutical Sciences. CSJMU, Kanpur. Plant Hormones and Their Applications. Plant hormones or phytohormones are chemicals that regulate plant growth. Plant hormones are signal molecules produced within the plant and occur in extremely low concentrations. Hormones regulate cellular processes in targeted cells locally and then moved to other locations, in other locations of the plant. They affect gene expression and transcription levels, cellular division, and growth. There are five major classes of plant hormones.. Chemicals that are made in one part of an organism, but affect another part of the organism. Allows a plant to respond to some stimulus in the environment. Allows it to bloom at an appropriate time. Allows it to grow toward a light source.