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I want to make the cells which values "1" to null in QGIS with Grass or Saga tools (exactly Saga).

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Thanks to Volker Wichmann from SAGA GIS forums. If you want to change the cell values to null you can use Saga reclassify grid values from Sextante. Enter the -99999 which will be null on the option for new values for other values. Saga accepts -99999 value as NoData.

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please accept your own answer then. –  Curlew May 12 '13 at 12:15
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In GRASS GIS (hence, in QGIS via GRASS toolbox or Sextante-GRASS plugin), use r.null to set selected values to NULL. Any cell value may be turned into NULL.

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Old, but for anyone else who runs into this, r.null is not yet running on Sextante. –  Nat Jul 17 '13 at 20:47
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