Abstract: Ammolium sulfate, sodium nitrite, urea, tyrosine, serine, lysine, alanine, arginine, leucine, histidine, cysteine and proline were selected as Nsource to prepare Czapek medium and to study their effect on the growth of wheat R.cerealis. The results showed that leucine and proline were the most favorable amino acids for the growth of R.cerealiss. It could utilize nitrates. nitrites and ammonium stilts more effectively, but could not utilize histidine and lysine. The relationship between the nitrogen nutrition of R.cerealis and its development and the nutrition status of wheat plant were discussed.

Key words: Rhizoctonia cerealis, Nitrogen source, Growth rate, wheat (Triticum aestivum), stress germination, gene expression, seed vigor, enzyme activity