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Abstract-Laboratory experiment was carried out during 2014 year to study the effect of dressing wheat seed (c.v. Misr1) with yeast extract, fungicides (Vitavax-200 and Maxim XL) or mixture of fungicide and yeast extract on physiological seed quality after 0, 6, 12,18 months from storage. The results revealed that prolonging storage period was significantly affected, where seed viability (germination percentage, germination rate, speed of germination), seedling vigor (seedling length and its dry weight as well as seedling vigor index), seed rot and abnormal seedlings after 18 months as compared with other storage periods. Increasing storage period lead to decreasing field fungi (Alternaria triticina, Bipolaris sorokiniana, Fusarium spp.) and increasing storage fungi (Aspergillus spp. and Penicillium spp.) Also, the effect of seed treatments by yeast extract or fungicides on all studied characters was significant, yeast extract treatment was the highest values followed by Maxim XL + yeast extract, Vitavax-200 + yeast extract, Maxim XL and Vitavax-200, respectively and gave the less value with abnormal seedlings and seed rot. Fungicides (Maxim XL and Vitavax-200) or Maxim with yeast extract lead to eliminated all fungi of seed wheat (c.v. Misr1), while yeast extract treatment reduced number of field and storage fungi. Field or storage fungi were negatively and significantly correlated with normal seedlings, speed of germination, seedling length, seedling dry weight and seedling vigor index, while it was positively significantly correlated with abnormal seedlings and seed rot. It could be suggested to use yeast extract (Saccharomyces cerevisiae ) 3gm/l or yeast extract + fungicides 2gm/kg (Maxim XL or Vitavax-200) as seed dressing of wheat to improve seed performance , reduce number of fungi in field and storage as well as decrease seed deterioration during storage. Key Word: wheatstorage seed borne fungi yeast fungicides.

Influence of Seed Dressing by Yeast Extract and Fungicides on Seed Quality of Wheat During Storage