L18 Growth Regulators I

L18 Growth Regulators I - ReviewofLecture17...

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Review of Lecture 17 Photosynthesis II: Chapter 8 1. The Calvin Cycle (the dark reactions) 2. Efficiency of carbon fixation 3. Photorespiration 4. The C 4  pathway 5. CAM plants
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The Calvin Cycle Chap.8, pg.178
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The Calvin Cycle 1. The first product of the Calvin cycle is a 3  carbon molecule,                  (3-phosphoglycerate  (PGA)) 2. Pathway is therefore also known as the  C 3 pathway 3. The cellular stockpiles of ATP and  NADPH, which are used in the C alvin  cycle, last only a few seconds or m inutes  and m ust be replenished by the light  reactions
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The Calvin Cycle As in other metabolic cycles, the  starting compound is regenerated Chap.8, pg.187
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To Bind or Not to Bind? photorespiration photosynthesis Chap.8, pg.188
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Spatial separation of C 3  and C 4  pathways  (Kranz anatomy) Chap.8,pg.190
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C 4  vs. CAM  1. CAM plants run the C 4  pathway  at night allowing organic acids  (malic acid) to accumulate in the  vacuole 2. During the day these organic acids  are used to supply CO 2  to the  Calvin cycle 3. CAM plants can keep their  stomata closed while using stored  CO 2  pools for photosynthesis Chap.8, pg.192 Temporal separation
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Evolutionary Innovations  1. Improving light harvest by adding another photosystem and  varying pigments 2. Improving energy generation by maintaining potential for cyclic  electron flow (photophosphorylation) 3. Improving CO 2  fixation a) By spatially separating fixation from sugar phosphate  synthesis and changing the permeability barriers surrounding  some cells b) By temporally separating fixation from sugar phosphate  synthesis and storing intermediates (starch, malic acid) for use  later
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The challenges 1. Harvesting light energy 2. Staying wet when things get dry 3. Dealing with gravity 4. Divide or be conquered  5. Leveraging resources
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Lecture 18 Outline Plant Growth Regulators I:Chapter 11 1. Plant hormones 2. Auxins 3. Genetics of Auxin Regulation 4. Cytokinins 5. Plant tissue culture
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Plant Hormones Plant Growth Regulators I: Chapter 11 1. Hormones direct growth and development 2. From the Greek hormon, meaning “to stir up” or “to  stimulate” 3. Hormones both stimulate and inhibit responses 4. Effects of a particular hormone depends on concentration,  location and timing 5. Key component of plant’s communication system
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Plant Hormones The concept of “hormones” arose from work in  mammalian systems 1. Shares three basic elements a) Synthesis in one part of body b) Transport to another part of the body c) Induction of a chemical response to control a  physiological event 2. In plants, some hormones act in the same tissues  where they are produced
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Plant Hormones Signal-transduction pathways
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L18 Growth Regulators I - ReviewofLecture17...

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