Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-27T22:27:31.240Z Has data issue: false hasContentIssue false
  • English
  • Français

Coleorhizal Hairs in Germinating Medusahead (Taeniatherum caput-medusae)

Published online by Cambridge University Press:  12 June 2017

Francis E. Northam ,
Robert H. Callihan  and
Michelle M. Puchalski
Francis E. Northam
Affiliation:
KSU Agric. Res. Ctr., 1232 240th Ave., Hays, KS 67601, [email protected]
Robert H. Callihan
Affiliation:
Dept. Plant, Soil and Entomol. Sci., Univ. of Idaho, Moscow, ID 83843
Michelle M. Puchalski
Affiliation:
Dept. Plant, Soil and Entomol. Sci., Univ. of Idaho, Moscow, ID 83843
Get access Rights & Permissions [Opens in a new window]

Abstract

This study documented an undescribed aspect of medusahead germination behavior. Fibrous hairs were consistently observed growing from the coleorhizal surface of germinating medusahead seeds. Three medusahead accessions were investigated to determine temperature effects on coleorhizal hair growth and germination. Coleorhizal hair emergence at 8 C was first noted at 72 h. By 24 h at 18 C, 15 to 74% of seeds had hairs, and at 28 C, hairs were visible on 75 to 94% of seeds. Germination at 18 and 28 C was 80% at 96 h; germination at 8 C did not exceed 80% until 168 h. Less than 4% of germinated seeds were without coleorhizal hairs. Appearance of coleorhizal hairs confirmed that germinating medusahead embryos were active at least 72 h before germination was complete. These data affirm coleorhizal hairs are a normal part of medusahead germination biology. Coleorhizal hairs probably aid early phases of medusahead seedling establishment.

Keywords

medusahead, Taeniatherum caput-medusae (L.) Nevski ♯ ELYCMGermination morphologygrass embryo morphologyELYCM
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 884 - 889
Copyright
Copyright © 1996 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Allen, P. S., While, D. B., and Markhart, A. H. 1993. Germination of perennial ryegrass and annual bluegrass seeds subjected to hydration-dehydration cycles. Crop Sci. 33: 1020–1025.Google Scholar
2. Bewley, J. D. and Black, M. 1994. Seeds Physiology of Development and Germination. Plenum Press, NY. p. 1, 3, 8.Google Scholar
3. Booth, E. W. 1964. Agrostology. Edwards Brothers Inc., Ann Arbor, Michigan. p. 118–120.Google Scholar
4. Chen, S. S. and Varner, J. E. 1970. Respiration and protein synthesis in dormant and after-ripened seeds of Avena fatua . Plant Physiol. 46: 108–112.Google Scholar
5. Davidson, D. 1979. Coleorhiza, root and coleoptile emergence and growth: effects of different water volumes. Can. J. Plant Sci. 59: 61–67.Google Scholar
6. Debaune-Gill, P. S. Allen, and Gardner, J. S. 1994. Morphology of the perennial ryegrass (Lolium perenne; Poaceae) coleorhiza and emerging radicle with continuous or discontinuous hydration. Am. J. Bot. 81: 739–744.Google Scholar
7. Foard, D. E. and Haber, A. H. 1962. Use of growth characteristics in studies of morphologic relations: similarities between epiblast and coleorhiza. Am. J. Bot. 49: 520–523.Google Scholar
8. Howarth, W. O. 1927. The seedling development of Festuca rubra L. var. tenuifolia Mihi, and its bearing on the morphology of the grass embryo. New Phytologist. 26: 46–57.Google Scholar
9. Nebgi, M. and Koller, D. 1962. Homologies in the grass embryo—a reevaluation. Phytomorphology 12: 289–296.Google Scholar
10. Nishimura, M. 1922. Comparative morphology and development of Poa pratensis, Phleum pratense and Setaria italica . Jap. J. Bot. 1: 55–85.Google Scholar
11. Northam, F. E. and Callihan, R. H. 1994. Interpreting germination results based on differing embryonic emergence criteria. Weed Sci. 42: 474–481.Google Scholar
12. Raghavan, R. 1986. Embryogenesis in Angiosperms. Cambridge University Press, Cambridge, England. p. 23, 96.Google Scholar
13. Salisbury, F. B. and Ross, C. W. 1985. Plant Physiology. Wadsworth Publishing Co., Belmont, CA. p. 416.Google Scholar
14. Swenson, C. F., LeTourneau, D., and Erikson, L. C. 1964. Silica in medusahead. Weeds 12: 16–18.Google Scholar
15. Young, J. A., Evans, R. A., and Eckert, R. E. 1968. Germination of medusahead in response to temperature and afterripening. Weed Sci. 16: 92–95.Google Scholar
16. Young, J.A., Evans, R.A., Gifford, R.O., and Eckert, R.E. 1968. Germination of medusahead in response to osmotic stress. Weed Sci. 16: 364–368.Google Scholar
17. Young, J. A., Evans, R. A., and Kay, B. L. 1971. Germination of caryopses of annual grasses in simulated litter. Agronomy J. 63: 551–555.Google Scholar
18. Young, J. A. and Young, C. G. 1986. Collecting, processing, and germinating seeds of wildland plants. Timber Press, Portland, Oregon. p. 190.Google Scholar
19. Young, J. A. 1993. Ecology and management of medusahead (Taeniatherum caput-medusae ssp. asperum (Simk.) Melderis). Great Basin Naturalist. 52: 245–252.Google Scholar