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Hint
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Answer
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Phase 1 of Sequential Leaf Senescence, leaves transition from Nitrogen sink to Nitrogen source, photosynthesis declines, early signaling events occur
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Initiation phase
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Found nearly exclusively in land plants, prevents Rubisco from being an oxygenase, accumulates CO2 from Malate
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C4 Carbon Cycle
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Shrinkage of cellular protoplasm away from the cell wall
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Plasmolysis
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50% of sunlight provided to forest floor is provided through...
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Sunflecks
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How much leaf adjustment takes place in acclimation process
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Plasticity
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State of phloem cell walls
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Non-lignified
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Carbon fixation step, takes carbon from CO2 molecule and glues it to Ribulose 1,5 bisphosphate, creating a 6 carbon chain, which is divided into 2, releasing O2
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Carboxylation phase
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Complex 5
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ATP synthase
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Rubisco acts as an oxygenase instead of a carbonate; uptake of atmospheric O2 with a concomitant release of CO2 by leaves in the light, molecular oxygen serves as a substrate for Rubisco, producing 2-phosphoglycolate that enters the photo-respiratory cycle, the activity of the cycle recovers some of the carbon found in 2-phosphoglycolate, but some is lost to the atmosphere
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Photorespiration
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Leaf is fully healthy and functional before any signals indicating otherwise, a gradient of auxin from the leaf blade to the stem maintains the abscission zone in an insensitive state
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Leaf maintenance phase
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Hint
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Answer
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Source to sink model for auxin flow, hypothesizes that auxin flows through tissues it stimulates, polarizing its own transport which becomes channelized over time, forming files of cells leading away from the auxin source which differentiates into vascular tissue
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Auxin canalization model
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Complex 4, 4 electron reduction of oxygen and H2O, 2 electrons per pair pumped out of matrix
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Cytochrome c Oxidase
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Process by which energy is released and stored as ATP for short term plant growth and development
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Aerobic Respiration
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In mitochondria, pyruvate brought into mitochondria and is decarboxylated and turned into Acytl-CoA, which goes through a series of conversions, "citric acid cycle"
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Tricarboxylic Cycle
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Developmental process in which leaves express a set of biochemical and morphological adjustments that are suited to a particular environment in which the leaves are exposed, can happen in new or old leaves
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Acclimation
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Main element of stomatal mechanics
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Potassium
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Energy from light reactions drives conversion of CO2 to carbohydrate in the chloroplast stroma, known as dark reactions in the past or Calvin-Benson Cycle; Composed of Carboxylation, Reduction, and Regeneration phases
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Carbon fixation reactions
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an active, genetically-controlled developmental process where cellular structures and macromolecules are broken down and translocated away from the senescing organ to regions of the plant serving as a nutrient sink, initiated by environmental cues and regulated by hormones
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Senescence
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Energy from sunlight energizes an electron in chlorophyll, moves along electron-transport chain in thylakoid membrane, aka photosynthetic electron-transfer reactions
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Light reactions
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The pattern of leaf senescence in deciduous trees in temperate climates in which all leaves undergo senescence and abscission in autumn
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Sequential leaf senescence
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