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The  effect of  three strains of  Watermelon  mosaic  virus   (WMV)  infection on  the  nitrogen  metabolism of  Luffa acutangula  leaves were studied and   found that the  infected levels  of  total  nitrogen, total  protein, nitrate  and nitrate nitrogen and  some  of free amino  acids   (aspartic, proline,  serine &  cysteine) were higher in  compari­ son  to  healthy plants,  but  ammonical nitrogen,  threonine,  alanine and   lysine were  low.