HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in Crop Science Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Argyris, J. Articles by TeKrony, D. Search for Related Content PubMed Articles by Argyris, J. Articles by TeKrony, D. Agricola Articles by Argyris, J. Articles by TeKrony, D. Related Collections Wheat Plant Disease Seed Production

SEED PHYSIOLOGY, PRODUCTION & TECHNOLOGY

Fusarium graminearum Infection during Wheat Seed Development and Its Effect on Seed Quality

Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091

^* Corresponding author (dtekrony{at}uky.edu).

Fusarium head blight (FHB) caused by Fusarium graminearum Schwabe causes losses in wheat (Triticum aestivum L.) seed quality and yield. Field studies were conducted in 2000 and 2001 to investigate F. graminearum seed infection (SI) and its relationship to seed germination and vigor and the production of the mycotoxin deoxynivalenol (DON). Seeds from four soft red winter wheat cultivars having different levels of Type II resistance to F. graminearum were harvested at frequent intervals during development and maturity. Low levels of SI occurred late in seed development in 2000, which resulted in high seed quality. In 2001, under heavy disease pressure, F. graminearum increased from <20% at 10 d after anthesis (DAA) to >98% at maturity in both resistant and susceptible cultivars, resulting in unacceptable standard germination (SG) (<80%) and seed vigor [<70% accelerated aging (AA) germination] early in seed development. Although fungicide seed treatment improved the SG of all cultivars, it still remained below acceptable commercial seed quality (80%). Deoxynivalenol was present at significant levels (5 to 25 mg kg^-1) throughout seed development and maturation in all cultivars in 2001. Although the resistant cultivar P25R18 had reduced levels of DON and lower seed damage compared with susceptible P2552, resistance had no effect on SI and seed quality. Therefore, under severe disease pressure, Type II resistance offers little advantage to seed producers in reducing SI and improving seed quality during severe FHB epidemics.

Abbreviations: AA, accelerated aging germination • CLA, carnation leaf agar • DAA, days after anthesis • DON, deoxynivalenol • FDS, Fusarium damaged seeds • FHB, Fusarium head blight • PDA, potato dextrose agar • PM, physiological maturity • SI, Fusarium graminearum seed infection • SG, standard germination

Related articles in Crop Science:

THIS ISSUE IN CROP SCIENCE

Crop Science 2003 43: 1581. [Full Text]