RESPONSE OF Citrullus colocynthis L. TO SINGLE AND COMBINED STRESSES OF SALINITY (NaCl) AND HEAVY METAL (NiCl 2 )

Salinity and heavy metal stresses are great hindrances to germination the early developmentof plants. Nickel (Ni) is an indispensable micronutrient for plants at low while toxic in highconcentrations. Citrullus colocynth L. a medicinal cucurbit weed desert agriculturalareas. Germination development of seedlings determine future plant. Thecontemporary target study appraise influence single combined byvarying concentrations NaCl NiCl 2 on C. colocynth.Germination percentage, radicle length, plumule fresh weight dry seedlingsof with three levels salt (100mM, 200mM 400mMNaCl), ofheavy (50, 100, 200uMNiCl ) Nine levels(100mMNaCl +50uM ),(200mMNaCl +50 uMNiCl (400mMNaCl (100mMNaCl +100uMNiCl )(200mM +100uM +200uMNiCl )(200mMNaCl +200 were studied. This experiment wasconceded out completely randomized design four replications. The responses showedan adverse trend increasing stress levels. seedling growth factors declinedunder high-stress (400mM NaCl), high HM (200 uM ), highsalt or but positively improved lower salt(100mMNaCl), (50uMNiCl )and (100mMNaCl+50uMNiCl ).