| Biology and Soil |
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| Effects of Salt and Water Stresses on Seed Germination of Karilinia caspica |
| WANG Zhi-cai, Yakupjan Aximu, WANG Yan, ZHANG Fu-chun |
| Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi 830046, China |
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Abstract Salt and water stresses have direct influences on seed germination. The present study explored the salt-tolerance characteristics of Karilinia caspica seeds with or without pappus after treated with NaCl of different concentrations. Seeds with or without pappus showed no significant difference in the final germination percentage, but the germination time of seed with pappus was prolonged due to pappus's hindrance to seed water absorption. No distinct seed dormancy was observed when seeds were treated by cold stratification, which suggested K. caspica seeds could germinate quickly once environmental conditions were favorable. The effects of NaCl stress and iso-osmotic PEG6000（polyethylene glycol） stress on K. caspica seed germination were checked. Results showed that: (1) both NaCl and iso-osmotic PEG greatly inhibited the seeds germination by reducing germination rate, prolonging germination time, and shortening germ and radicle; (2) the influence of NaCl on K. caspica seed germination was obviously greater than that of iso-osmotic PEG, which suggested that ion stress was the main factor that inhibits seeds germination of K. caspica; (3) the critical and the extreme concentrations of NaCl for K. caspica seeds germination were 213 mM and 340 mM respectively; (4) low concentration of NaCl (50 mM) had little influence on K. caspica seeds germination as well as the growth of germ, indicating that K. caspica seeds can germinate normally under low salt condition; (5) high concentration salt stressed ungerminated K. caspica seeds showed high regermination rate under rewatering treatment, though the final germination rates of the seeds treated with different NaCl concentrations were not significantly different, indicating that high NaCl stress drove the seeds into dormancy but no damage to seed viability.
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Received: 27 August 2011
Published: 20 May 2012
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2012, Vol. 32 
