BIOL 111 Lecture Notes - Lecture 8: Indole-3-Acetic Acid, Auxin, Megaspore

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Andrew Hendry

Document Summary

Qualitative increase (as opposed to quantitative in case of growth) Mutants that lack these hormones or their receptors are dwarfs. Produced in shoot apical meristems and young leaves. Fungi that produce ga infected rice, induced hyper-elongated stems. Aba must degrade or leach out before seed will germinate. Sometimes seed coat is too mechanically strong freeze-thaw or micro-organism weakens. Small seeds need light signal to prove they are close to surface, not too deep because climbing up takes energy. Asexual: ex potato tuber: underground stem, new plant produced from potato eyes" axillary buds. Ex kalanchoe/byrophyllum: plantlets on leaves fall to the ground and become independent plants. An inductive photoperiodic cycle = combination of night-length and day-length. Some plants need one, others several inductive cycles. Exposure to 1 leaf to inductive cycles can induce flowering, thus some hormone moves from induced leaf to shoot apex where flowers are produced. Snp: short day, ex soybean critical photoperiod of 15. 5h -> t <= 15. 5.