Spring.wmf (18300 bytes) Plant Physiology (Biology 327)  - Dr. Stephen G. Saupe;  College of St. Benedict/ St. John's University;  Biology Department; Collegeville, MN  56321; (320) 363 - 2782; (320) 363 - 3202, fax;    ssaupe@csbsju.edu

  Test Yourself:  Plant Growth Substances

For each of the following, indicate the appropriate hormone (auxin, gibberellin, ABA, cytokinin, ethylene).  There may be more than one correct answer for some questions.

  amounts that stimulate shoot growth inhibits roots
  delays senescence
  derived from a catabolic pathway
 

diterpene

  fattens cells
 

first detected in foolish seedling disease

  first observed because of aberrant growth of rice
  forms bound complexes with glucose or other compounds
  found in commercial rooting preparations
  benzyladenine has a similar activity
  basipetal transport
  associated with crown gall formation
  active in phototropism and gravitropism
  first discovered by Frits Went in bending of oat coleoptiles
  gas
  important in embryogenesis
  involved in leaf abscission
  planar ring with 0.5 nm charge separation polar transport
 

promotes fruit ripening

  promotes senescence
 

obtained from coconut milk

 

more than 100 types known

 

maintains dormancy

 

involved in witches broom formation

 

involved in thigmomorphogenesis

 

related to the climacteric

  responsible for epinasty
 

silver ions inhibit actions

 

some think they may be made by bacteria rather  than plants

 

split pea curvature test

 

stimulates conversion of etioplasts into chloroplasts

  stimulates dicot cotyledon expansion
  stimulates ethylene synthesis
  used in malting industry
 

stimulate root initiation

  associated with the anticodon region of tRNA
  derived from Greek word meaning "to grow"
  2,4-D is a synthetic version
  tri-iodobenzoic acid (TIBA) inhibits transport of this hormone
  results in short, fat and stupid seedlings
  helps provide embryo with desiccation tolerance
 

 

 

  controls morphogenesis of plant tissue cultures
  derived from carotenes (tetraterpenes)
  dioxin is a byproduct of the manufacture of these hormone analogs
  apples are a rich source of this hormone
  closes stomata
  chemically similar to nucleotide in DNA
  causes loosening of the cell wall
  carbon dioxide inhibits many actions
  occurs as free base, nucleoside, nucleotide
  breaks dormancy in seeds and buds
  bolting
  biosynthesized from tryptophan
  coconut milk is a rich source
  coded by two genes on the Ti plasmid
  indole ring
 

involved in apical dominance

 

promotes flowering of pineapples

  prevents vivipary
  promotes stem elongation in intact plants
  parthenocarpic fruit development
 

often antagonistic to effects of ABA

 

napthalene acetic acid has similar activity

 

molecule with 4 or 5 rings

 

methionine is the amino acid precursor

  HCN produced during biosynthesis
 

reverses dwarfing in some plants

 

reverses juvenility in ivy

 

stimulates a membrane-bound proton pump

 

stimulates amylase production in cereal grains

  stimulates cell elongation
  stimulates seed germination
  synthesis is stimulated by wounding
  terpene
 

triple response

 

stimulates coleoptile/shoot elongation but inhibits root growth

  used to increase size and spacing in grapes
  sesquiterpene
  affects sex expression in plants
  about 40 different structures are known
 

AMO1618 inhibits synthesis

  one bad apple spoils the whole bunch
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Last updated:  01/07/2009     � Copyright  by SG Saupe