溫度、水分與鹽分變化對土人參種子(Talinum triangulare Willd.)發芽之影響

Abstract

The germination requirements of Talinum triangulare were studied under control conditions in the laboratory. Treatments included 7 temperature regimes (fluctuating day: night temperature regimes of 50℃: 45℃, 45℃: 40℃, 40℃: 35℃, 35℃: 30℃, 30℃: 25℃, 25℃: 20℃ and 20℃: 15℃), 6 water potential levels (0 MPa、-0.05 MPa、-0.1 MPa、-0.2 MPa、-0.3 MPa and -0.4 MPa), and 9 salinity concentrations (0%、0.05%、0.1%、0.2%、0.3%、0.4%、0.6%、0.8% and 1.0% NaCl), using a completely randomized design with 3 replications. The seeds germinated at temperatures between 25 and 45℃ with the optimum. The best germinate temperatures was 35/30℃ of alternate temperatures. If the alternate temperatures was 50/45℃ (light/dark) and 20/15℃, the seed can't germinate. The best germinate temperatures was 35℃ of constant temperatures. If the constant temperatures was 50℃ and 20℃, the seed can't germinate. The seeds germinated at water potentials between 0 MPa and -0.2 MPa with the optimum. The best water potentials was 0 MPa. The seeds germinated at salt stress between 0% and 0.8% with the optimum. If the salt stress higher with 0.8%, the seed wasn't germinate. When the alternate temperatures were 25/20℃ and salt stress was 0.6%, the seeds germination only was 0.7%. When the alternate temperatures were 35/30℃ and salt stress was 0.8%, the seeds germination was 56.7%. When the alternate temperatures were 40/35℃ and salt stress was 0.6%, the seeds germination was 42.7%. The optimum temperatures can enhance the Talinum triangulare Willd.'s salt stress level.