Abstract:

To explore the physiological and biochemical characteristics of cut peony under NaCl stress,the flower branches of the cut peony variety Shirley Temple with the first level of flowering series as the test material were treated with different concentrations of NaCl(0,0.2%,0.4%,0.6%)by hydroponics method.The phenotype changes of the flower branches were observed,and the corresponding physiological and biochemical reactions were measured by DAB and NBT staining,so as to understand the salt tolerance potential of the cut peony Shirley.To explore the salt tolerance mechanism of cut flower peony.The results showed that there was no significant change in branch phenotype of peony Xiulan under 0.2% salt stress,the leaf became slightly yellowed and curled under 0.4% salt stress,and the leaf curled and wrinkled under 0.6% salt stress.Under salt stress,leaf water content and chlorophyll content decreased significantly with the increase of salt concentration.Electrolyte permeability and proline content were significantly increased.The accumulation of reactive oxygen species($\mathrm{O}^{\bar{.}}_{2}$ and H₂O₂)and the activity of various antioxidant enzymes were significantly up-regulated under high concentration salt stress.In summary,0.2% salt stress had little effect on Xiulan,but 0.4% and above salt concentration exceeded the tolerance range of Xiulan.The cut peony Xiulan can cope with salt stress mainly by increasing the content of osmoregulatory substances and antioxidant enzymes.

Key words: Peony, NaCl stress, Salt tolerance, Physiological and biochemical index

CLC Number: 

• S682.12