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

Temperature, Water, and Salinity Effects on the Seed Germination of Talinum triangulare Willd.

曾膺中(Ying-Jung Tzeng) ； 侯金日(Chin-Jin Hou)

《中華民國雜草學會會刊》 30卷2期 (2009/12) Pp. 95-107

https://doi.org/10.6274/WSSROC-2009-030(2)-095

摘要

本研究主要探討在溫度、水分與鹽分逆境下，對土人參(Talinum triangulare Willd.)種子發芽之影響。試驗結果如下：可發芽之溫度範圍為25-45℃，最適發芽溫度為35℃/30℃（光照／黑暗）之變溫環境，當溫度於20℃/15℃或50℃/45℃時即無法發芽；恆溫下35℃為最適生長溫度，在20℃或50℃則無法發芽，但變溫下發芽之表現較恆溫佳。可發芽之水分潛勢為0 MPa至-0.2 MPa之間，最適水分潛勢為0 MPa。鹽分濃度0%至0.8%之間可發芽，高於0.8%則無法發芽，當適合溫度35/30℃時，在0.8%鹽分濃度下尚有56.7%之發芽率。故土人參種子適合於高溫環境下發芽，對於水分有相當的需求，但對鹽分變化有一定程度之耐受性。

關鍵字

土人參 ； 發芽率 ； 溫度 ； 水分潛勢 ； 鹽分濃度

並列摘要

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.

並列關鍵字

Talinum triangulare ； germination ； temperature ； water potential ； salinity