Meristematic root tip cells of Lathyrus sativus L., representing nucleolar alterations (frequency and volume) after 72 hrs of germination after increasing concentrations of salt priming. Photomicrophotograhs (A–L) showing different shapes and states of nuclear morphometrics after different concentrations of NaCl priming in germinating root tips of Lathyrus sativus L., A. Control root tip cells showing intact nuclear membranes with double nuclei. B. Root cells after 100 mM NaCl pretreatment showing all double nuclei with disappearing nuclear membrane. C. Root cells after 200 mM NaCl pretreatment showing no nuclear membranes with big round to oblate and pear-shaped nucleoli showing translucent multiple lesions. D. Root cells after 200 mM NaCl pretreatment showing round to oblate micronucleoli showing diplo to streptococci like appearance; E. Root cells after 200 mM NaCl pretreatment showing micronucleoli , 4-6 in numbers adhered together. F. Root cells after 300 mM NaCl pretreatment showing reduced cellular volumes oblate-shaped micronucleoli with gradual comingling; G. Root cells after 400 mM NaCl pretreatment showing altered cellular morphologies with pear to oblong shapes nucleoli; H. Root cells after 400 mM NaCl pretreatment showing pear-shaped, eye-shaped and dumbbell-shaped nucleoli, with diminishing nucleolar volume; I. Root cells after 400 mM NaCl pretreatment showing dumbbell-shaped nucleoli with nulceolar notches and fragmentations; J. Root cells after 400 mM NaCl pretreatment showing multiple micronucleoli formations with translucent cytotoplams; K. Root cells after 500 mM NaCl long strap cells with almost no-cytoplasm and multifragmented micronucleoli scattered around; L. Root cells after 500 mM NaCl pretreatment showing no only 2-3 micronuceli scatted around corners with ruptured cell walls showing aopototic appearances.