Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 18:573-575 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Long, B. J.
Right arrow Articles by Routley, D. G.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Long, B. J.
Right arrow Articles by Routley, D. G.
Agricola
Right arrow Articles by Long, B. J.
Right arrow Articles by Routley, D. G.

Relationship of Hydroxamate Concentration in Maize and Field Reaction to Helminthosporium turcicum1

B. J. Long, G. M. Dunn and D. G. Routley2

In 1959, the cyclic hydroxamate 2,4-dihydroxy-7-methoxy-l,4-benzoxazin-3-one (DIMOBA) was first reported maize (Zea mays L.) and has since been implicated in resistance to several pathogens. In our study, 14 inbred lines of maize commonly used as parents of many hybrids in the United States, plus the genotypes BxBx and bxbx were utilized to test the relationship of concentrations of hydroxamates and resistance to Helminthosporium turcicum Pass. in the field. One set of the 16 inbreds was analyzed for hydroxamates nondestructively by a rapid procedure using steam tissue from seedlings 36 to 40 cm high. The same set of inbred lines was similarly analyzed at mid-silking stage by Hamilton's procedure using leaf tissue. A second set of the 16 inbred lines was inoculated in the field with spore suspensions of H. turcicum and evaluated for resistance at mid-silking stage using a visual rating scale.

A highly significant correlation (r = 0.76, dr. = 43) was obtained between concentrations of hydroxamates in stem tissue from the seedlings and hydroxamate concentrations in leaf tissue at mid-silking stage. A significant correlation (r = 0.57, dr. = 46) was obtained between concent.rations of hydroxamates in seedling stem tissue and resistance to H. turcicum. Similarly, a highly significant correlation (r = 0.64. df. = 43) was obtained between hydroxamate concentrations in leaf tissue of inbreds at mid-silking stage and resistance to H. turcicum.

Key Words: Cyclic hydroxamate • Disease resistance

1 Published with the approval of the Director of the New Hampshire Agric. Exp. Stn. as scientific contribution no. 881. Submitted by the semor author in partial fulfillment for the Ph.D. degree. This research was supported in part by Pioneer Hi-Bred International, Inc.

2 Graduate research assistant and professors of plant sci., Plant Science Dep., Univ. of New Hampshire, Durham, NH 03824.

Received for publication August 4, 1977.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Plant Registrations Soil Science Society of America Journal
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 1978 by the Crop Science Society of America.