Liu K.-B.,Gansu Psammophytes Engineering Technology Research Center |
Jiang S.-X.,Minqin Desert Botanical Garden
Acta Prataculturae Sinica | Year: 2016
In order to study the seed germination characteristics of Apoceynum venetum under different stresses of drought and sodium salt, germination was tested with four different osmotic potential and sodium salt solutions (NaCl, Na2SO4, NaHCO3, compound sodium salt). The results showed that when seeds were treated with the PEG high osmotic potential (-0.05 MPa), low concentration of Na2SO4 (0.2%) and the compound salt solutions (0.2% to 0.6%), the germination rate, index and drought index were more than CK, the average germination times were less than CK and salt damage rate was a negative value. Germination peak was in 2-4 d. The solutions promoted seed germination according to decreasing osmotic potential and increasing salt concentration. The germination potential, rate, index, and drought index gradually reduced, average germination time extended and salt damage rate increased, with germination peak at 2-3 d. When treated with the NaCl and NaHCO3 solutions, increasing concentrations caused the germination rate, potential and index to significantly decrease. The average germination time was delayed, germination peak was in 2-3 d, seed germination penetration and toxic effects were enhanced. When treated with the PEG and compound salt solutions, the appropriate value, critical value and limit value of osmotic potential and concentration was -0.09, -0.70, -1.30 MPa and 0.85%, 2.04%, 3.22% respectively. When treated with the same concentration of salt solution, the salt injury rate was NaHCO3>NaCl>Na2SO4>compound salt. Copyright © ACTA PRATACULTURAE SINICA.