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Plant Physiol, October 2000, Vol. 124, pp. 655-664
Distribution of Peltate Glandular Trichomes on Developing Leaves
of Peppermint1
Glenn W.
Turner,
Jonathan
Gershenzon,2 and
Rodney B.
Croteau*
Institute of Biological Chemistry, Washington State University,
Pullman, Washington 99164-6340
The pattern of peltate glandular trichome initiation and ontogeny
on expanding peppermint (Mentha × piperita) leaves was defined by surveying the
populations of peltate glands in each of seven developmental stages
within sampling areas of leaf apical, mid-, and basal zones for both
abaxial and adaxial surfaces. It was shown that new peltate glands
continue to form until leaf expansion ceases and that regions of active
gland initiation are unevenly distributed. The distribution of gland
initiation reflects the basipetal pattern of leaf maturation, with
relatively immature regions at the leaf base continuing to produce oil
glands long after gland production has stopped at the leaf apex. The
proportion of glands in the secretory stage as a function of leaf
development and the direct observations of living glands over a period
of 33 h indicate that a period of only 20 to 30 h of
secretory activity is required for filling of the gland storage
compartment with essential oil. These findings are discussed in
relation to earlier literature describing age-related changes in
glandular essential oil content.
1
This work was supported in part by
the U.S. Department of Energy, Division of Energy Biosciences; by the
Mint Industry Research Council; and by the Agricultural Research
Center, Washington State University (project no. 0268).
2
Present address: Max Planck Institut für Chemische
Ökologie, Tatzenpromenade 1a, D-07745 Jena, Germany.
*
Corresponding author; e-mail croteau{at}mail.wsu.edu; fax
509-335-7643.
© 2000 American Society of Plant Physiologists
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