Physiological and Growth Response of Phalaris Arundinacea Seeding to Salt Stress

Conducting three-week-long salt stress treatment with NaCl and NaCl+NaHCO3 salt solution of different concentration for phalaris arundinacea newly selected locally. Through determining stem-leaf biomass, root biomass, stem-leaf relative water content, leaf conductance and content of malonaldehyde, chlorophyll and proline, we can study the influence of two types of salt stress on physiology and growth of phalaris arundinacea seeding. The result shows that stem-leaf biomass, root biomass, stem-leaf relative water content and chlorophyll content reduce as salt concentration increases, among which stem-leaf biomass reduces more than root biomass; while leaf conductance, malonaldehyde content and proline content increase as salt concentration rises. When salt concentration reaches 100mmol/L, leaf conductance and free proline content in A and B groups are 34.5%, 25.16% and 56.85% and 45.34% higher than those in the blank group respectively, with great difference(P0.05), while stem-leaf biomass and chlorophyll content in A and B groups are 13.2%, 19.01% and 24.43% and 23.9% lower than those in the blank group respectively, with tremendous difference(P0.01). NaCl+NaHCO3 salt mixture has greater influence on the growth of phalaris arundinacea seeding than NaCl, which indicates that phalaris arundinacea is sensitive to alkaline salt stress.