LAB__7_-_Plant_hormones_&_responses

LAB__7_-_Plant_hormones_&_responses - Plant Hormones...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Plant Hormones and Responses Plant hormones or phytohormones – chemical messengers that regulate a plant’s growth have an effect on plant’s growth, tropisms, changes in plant parts, interaction between the plant’s life cycle and environment affect enzyme activity, protein synthesis or membrane permeability a plant response usually a result of interaction between 2 or more hormones
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
APICAL MERISTEM – the undifferentiated tissue from which new cells are formed (the tips of roots or stems; the growing tip).
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MAIN PLANT HORMONES AUXIN (IAA = i ndole-3- a cetic a cid) GIBBERELLINS (GA) CYTOKININS (CK) ABSCISIC ACID (ABA) ETHYLENE
Background image of page 4
AUXIN found in shoot apical meristem , young leaves, and embryo Stimulates cell elongation and root growth (low conc. only) Delays leaf senescence and fruit ripening Stimulates growth of flower parts and fruits Stimulates the production of ethylene at high conc. Can inhibit or promote (via ethylene stimulation) leaf and fruit abscission Controls phototropism and geotropism (gravitropism) Promotes xylem differentiation
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
GIBBERELLINS found in young leaves, meristems of apical buds and roots, embryo Promote stem elongation and leaf growth Promote seed and bud germination Stimulate flowering and development of fruit Affect root growth and differentiation
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/19/2008 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.

Page1 / 20

LAB__7_-_Plant_hormones_&_responses - Plant Hormones...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online