Growth, photosynthesis and H+-ATPase activity in two Jerusalem artichoke varieties under NaCl-induced stress

► NY-1 and QY-2 are tolerant to salt, but they have different tolerance strategies. ► NY-1 has a higher activity of H+-ATPase and lower Pn, Gs and Tr than QY-2. ► QY-2 kept a higher proline increasing rate and produced more chlorophyll under salt stress. ► The finding provides the possibility for selecting salt-tolerant genotypes of H. tuberosus.