首页|Seed priming with cypress leaf extract enhances photosynthesis and antioxidative defense in zucchini seedlings under salt stress
Seed priming with cypress leaf extract enhances photosynthesis and antioxidative defense in zucchini seedlings under salt stress
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NSTL
Elsevier
Exogenous ameliorants hold a great potential to strengthen endogenous plant defence under various environmental stresses, including salinity. The effects of Cypress Leaf Extract (CLE, as a biostimulant) and salicylic acid (SA) on growth, physio-biochemical and molecular responses of zucchini (Cucurbita pepo L. cv. Kavili) seedlings under salt stress were investigated. Salt stress resulted in decreased photosynthesis activity and increased oxidative stress. However, CLE- and SA-pretreatment of salt-stressed seedlings enhanced their growth, photosynthetic capacity, antioxidant enzyme (SOD, CAT, APX, GPX, GR, and DHAR) activities and the contents of ascorbate, glutathione and proline as compared to the salt-stressed untreated seedlings. CLE- and SA-pretreatment also alleviated the salt stress-induced negative effects on CO2 assimilation and significantly increased the activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). Furthermore, CLE pretreatment also upregulated the expression of stress-inducible antioxidation-related genes (CuZnSOD2, CAT1, APX, GR, DHAR and PrxQ) in salt-stressed seedlings. Interestingly, CLE was found to outperform SA in augmenting these processes under both stress and stress-free conditions. Our study reveals that CLE-mediated enhancement of photosynthesis and antioxidative defence mechanisms plays a crucial role in the alleviation of salt stress, and thereby increasing salt tolerance and growth of zucchini plants.
NSTL
Elsevier
