PROMOTIVE EFFECT OF L-PROLINE ON THE GROWTH OF WHEAT CALLUS THE BLOCKING EFFECT OF PHYLLANTHUS EMBLICA L.ON THE FORMATION OF STRONG CARCINOGEN N-NITROSO COMPOUND IN HUMAN BODY A PRELIMINARY STUDY ON THE L-PROLINE ROLES IN WHEAT CALLUS CULTURE Hormonal Regulation and Effect of L-Proline on Somatic Embryogenesis of Sainfoin