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The aim of this research was to estimate the influence of different NaCl  osmotic solutions (0, -0.3 MPa, -0.6 MPa, -0.9 MPa, -1.2 MPa, -1.5 MPa) on  seed germination, and early seedling growth in two maize hybrid different  maturity groups (ZP 560 - FAO 500 and ZP 666 - FAO 600). Germination was  tested in sterile plastic vessels on filter paper moistened with different  NaCl solutions, in the dark at 20 ± 1°C, in laboratory. Results of ANOVA  indicated that hybrid ZP 666 had significantly higher root length (RL) (6.37  cm), shoot length (ShL) (2.06 cm), shoot fresh weight (ShFW) (43.86 mg),  root dry weight (RDW) (7.56 mg), shoot dry weight (ShDW) (5.97 mg), seedling  vigor index (SVI) (706.55) and dry matter stress tolerance index (DMSI)  (55.85%) than hybrid ZP 560 (4.18 cm, 1.14 cm, 32.50 mg, 6.54 mg, 4.15 mg,  457.61 and 48.86%, respectively). Contrary, hybrid ZP 560 had significantly  higher relative seedling water content (RSWC) (83.83%) and phytotoxicity of  shoot (PhSh) (69.77%) than hybrid ZP 666 (81.16% and 62.51%, respectively).  Generally, hybrid ZP 666 had better tolerance to salt stress than hybrid ZP  560. Germination energy (GE), germination (G), RL, ShL, root fresh weight  (RFW), ShFW, RDW, ShDW, rate germination index (RGI), SVI, RSWC and DMSI  were significantly decreased with the increase in osmotic stress induced by  NaCl. Contrary, phytotoxicity of root (PhR) and PhSh significantly increased  with the increase in osmotic stress.

The influence of genotype and osmotic stress on germination and seedling of maize