Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:55-60 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Defoliation and Nitrogen on the Development and the Fructan Composition of the Vegetative Reproductive System of Timothy Phleum pratense, L.)1

R. W. Sheard2

A sequence of development of the vegetative reproductive system of timothy consisting of primary and secondary haplocorms and tertiary shoots is proposed. Initiation of spring growth was from tertiary shoots and independent of the primary and secondary haplocorms. Nitrogen fertilization at 280 kg N/ha decreased the dry weight and fructan in primary haplocorms but increased the dry weight and fructan in the secondary haplocorms, particularly during the initial formative period. Nitrogen increased the dry weight but lowered the fructan concentration in the tertiary shoot. Survival and spring growth were not restricted where the fructan in the tertiary shoot was reduced by two-thirds to a level of 5% over the winter dormancy period.

Key Words: haplocorm • carbohydrate

1 This study was supported in part by the Ontario Agricultural College, University of Guelph, and the Ontario Dept. Agr. and Food, and in part by the College of Agriculture, Cornell Univ. It is a portion of a thesis submitted by the author in partial fulfilment of the requirements for the Ph.D. degree at Cornell University. Agron. Pub. No. 752.

2 Associate Prof. of Soil Science, O.A.C., Univ. of Guelph, Guelph, Ontario.

Received for publication April 15, 1967.




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Environmental Quality		 The Plant Genome
Copyright © 1968 by the Crop Science Society of America.