petiole: the stalk of a leaf. photoperiodism: the control of flowering and other physiological processes by the intensity, length, timing and quality of light and dark periods. phototropism: the movement or growth of an organism toward or away from a unilateral source of light. phytochrome: a photoreversible, bluish-green pigment that, in response to variations in red light, controls many phases of plant growth and development; occurs in two forms, a far-red light absorbing form that is formed in response to red irradiation and a red light absorbing form formed in response to far red irradiation. plumule: the growing stem tip of the embryo of a seed above the place of attachment of the cotyledons. rods: rod-shaped cells of the retina of the vertebrate eye that are sensitive to dim light; concerned with vision in dim light. short-day plant: photoperiodic plant that flowers when the light period does not exceed a critical length. sporophyte: the spore-bearing generation of a plant's life cycle that is diploid and reproduces by spores; the sporophyte generation begins with the fertilized egg and ends with meiosis. vascular plants: plants with specialized tissues, xylem and phloem, for support and conducting water and nutrients.
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