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27 Cards in this Set
- Front
- Back
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hormone
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A substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism.
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phototropism
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Growth or movement of a sessile organism toward or away from a source of light
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auxin
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an organic substance that is able in low concentrations to promote elongation of plant shoots and usually to control other specific growth effects like root formation and bud growth
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cytokinins
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Any of a class of plant hormones that promote cell division and growth and delay the senescence of leaves
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gibberellin
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Any of several plant hormones, such as gibberellic acid, used to promote stem elongation
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abscisic acid (ABA)
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A plant hormone, C15H20O4, involved in the abscission of leaves, flowers, and fruits and the dormancy of buds and seeds.
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ethylene
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Hormone in plants functioning especially as a natural growth regulator that promotes the ripening of fruit
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senescence
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The process of growing old; aging
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oligosaccharins
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molecule that triggers defense response in plants, released by cell wall damage
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brassinosteroids
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steroid hormones in plants that have a variety of effects
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tropisms
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The turning or bending movement of an organism or a part toward or away from an external stimulus, such as light, heat, or gravity.
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gravitropism
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Directional growth of a plant organ in response to a gravitational field roots grow downwards, shoots grow upwards. Achieved by differential growth on the sides of the root or shoot. A gravitation field is thought to be sensed by sedimentation of statoliths (starch grains) in root caps.
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statoliths
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specialized starch containing plastids, settle to lower part of cell
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thigmomorphogenesis
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a plants response to chronic mechanical stimulation
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action potentials
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The change in membrane potential occurring in nerve, muscle, or other excitable tissue when excitation occurs.
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circadian rhythm
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A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms
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photoperiodism
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The response of an organism to changes in its photoperiod, especially as indicated by vital processes
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short-day plant
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a plant that flowers only when the light period is shorter than a critical length
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long-day plants
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plant that flowers only when the light period is longer than a critical length
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day-neutral plants
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a plant whose flowering is not affected by photoperiod
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phytochrome
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A cytoplasmic pigment of green plants that absorbs light and regulates dormancy, seed germination, and flowering
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heat-shock proteins
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a protein that helps protect other proteins during heat stress
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gene-for-gene recognition
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widespread form a plant resistancewhere pathogen derived molecules are recognized by specific plant resistance genes
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phytoalexins
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an antibiotic produced by plants
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PR proteins
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a protein involved in plant responses to pathogens
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hypersensitive response
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a plant's localized defense to a pathogen
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systemic acquired resistance (SAR)
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a defensive response in infected plants to protect healthy tissues
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