| The effects of exogenous hydrogen sulfide on the seed germination of processing tomato under salt stress were investigated. Seeds of two processing tomato cultivars KT-63(salt resistance is weak) and KT-18(stronger salt tolerance) were treatment with semi-lethal concentration of NaCl(85 mmol·L-1, 120 mmol·L-1) and NaHS(0.2,0.4,0.6,1.0 mmol·L-1) mixture, respectively. The results showed that: With increasing NaHS level, the germination rate, germination energy, germination index, vigor index, SOD, POD and CAT activities first increased and then decreased. Compared with salt stress, treatments with 0.4 mmol·L-1 NaHS significantly increased seed germination rate, germination index, vigor index and the activities of SOD, POD and CAT in KT-63(70%,250%,120%,130%,6.7%,150% and 180%, respectively) and KT-18(50%,250%,60%,80%,4.3%,160% and 200%, respectively), and the content of MDA was decreased. The mitigation effect of hydrogen sulfide on KT-63 is stronger than KT-18. Results provide evidence that 0.4 mmol·L-1 of H2S may alleviate damage to seeds caused by salt stress, expedition of seed germination. |