An organic compound in multicellular organisms that causes developmental or growth responses in target cells.
The first plant hormone discovered; produced in or near apical meristems suppresses the growth of axillary buds; stimulates growth of plant cells.
The suppression of axillary bud growth by auxin produced by a terminal bud.
Member of a group of plant hormones affecting cell elongation and seed germination.
The rapid production of a long flowering stalk; caused by gibberellin.
A method of growing a whole plant, plant organs, or plant tissues from cells in an artificial medium containing nutrients and hormones.
A hormone synthesized in roots that controls cell division and differentiation; counteracts apical dominance and delays aging of leaves
the organic process of growing older and showing the effects of increasing age
A gas that acts like a hormone, causing responses to mechanical stress and stimulating aging responses such as fruit ripening and leaf abscission.
A hormone that controls the opening and closing of stomata by causing water to enter or leave guard cells. Also establishes dormancy in seeds and other plant organs.
Use of cold treatment to hasten flowering.
Growth toward or away from light.
A plant's response to the relative lengths of night and day.
A plant that flowers when days are shorter than a critical length; actually flowers when night length is longer than a critical length.
Plant that flowers only when the day length is longer than a critical length. Actually flowers when the night length is shorter than the critical length.
Day Neutral Plants
A plant that flowers regardless of the day length.
A biological cycle of approximately 24 hours.
Heliotropism; Describes flowers or leaves that either follow the sun or avoid the sun throughout the day
A growth response produced by a hormone that causes turning toward or away from an external stimulus.
Growth toward or away from gravity.
Sudden closing of mimosa leaves when touched
A growth pattern in which an organism or tissue grows for a limited time, typical of animals and floral meristem.
Unlimited growth throughout the life of a plant. Many vegetative meristems.