Seed Germination of Calotropis gigantean Under Drought Stress Simulated by PEG
In order to study the water tolerance of Calotropis gigantean in seed germination stage,the effect of different PEG-6000 solutions(5％ ,10％ ,15％ ,20％ ,25％ and 30％) on the seed germination and seedling growth were conducted by Petri dish and filter paper germination method.And the germination recovery after presoaking with PEG solution were studied.The results showed that:with the increase of drought stress, daily relative germination rate, germination percentage, germination potential,germination index,vigor index and drought index showed a downward trend,and the lower concentration PEG(5％, 10％) can promote the radicle length, whereas high concentration had inhibition effects.Whereas the 25％ or 30％ PEG concentration, the seeds of G.gigantean did not germinate.Nevertheless, when the stress was removed, under appropriate conditions, the seed recovered their germination.The seed treated with 25％ PEG solution could remain high germination.
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