Effects of partial defoliation on the growth, ion relations and photosynthesis of Lycium chinense Mill. under salt stress

Abstract

In this study, we investigated the effects of artificial defoliation on the growth and physiological response of Lycium chinense Mill. to salt stress. Our results show that partial defoliation increases the plant relative growth rate, leaf water content and dry weight-based leaf Na+ content, and reduces the fresh weight-based leaf Na+ content under salt stress. In response to defoliation, the leaf Na+/Ca2+ and Na+/Mg2+ ratios were decreased, but the K+ content remained unchanged. The contents of ROS and MDA were decreased in defoliated plants. Net The photosynthetic rate (PN), stomatal conductance (gs), electron transport rate (ETR), actual photochemical quenching (ΦPSII) and photochemical quenching (qp) were enhanced by defoliation. Together, these findings indicate that partial defoliation mitigates the salt-induced growth inhibition and physiological damage in L. chinense.

Keywords

• ion accumulation
• Lycium chinense Mill.
• partial defoliation
• photosynthesis
• salt stress