A procedure was studied on cryopreservation of Photinia serrulata shoot-tips in vitro by vitrification. The excised shoot-tips which were cultured for 30 d, 1.5～2.0 mm long, were loaded with 60% PVS2 for 40 min at ro...A procedure was studied on cryopreservation of Photinia serrulata shoot-tips in vitro by vitrification. The excised shoot-tips which were cultured for 30 d, 1.5～2.0 mm long, were loaded with 60% PVS2 for 40 min at room temperature in effendoff tube, then were exposed to PVS2 at 0 ℃ for 50 min. Followed by changing the solution with fresh PVS2, the tubes were immersed into LN2 directly. After 24 h storage, the effendoff tubes were rapidly thawed in the water bath at 40 ℃, the shoot-tips were washed twice with 1.2 mol·L -1 sucrose solution for 10 min and transferred onto MS medium supplemented with 6-BA 2.0 mg·mL -1 . The cultures were kept in dark for one week prior to exposure to the light. Survival rate of shoot-tips was 93.33% by TTC examination, and regeneration rate reached 41.67%.展开更多
Salicylic acid (SA) is one of numerous phenolic compounds found in plants with numerous important physiological events. Exogenously application of Salicylic acid (SA) is useful for the growth and development of plants...Salicylic acid (SA) is one of numerous phenolic compounds found in plants with numerous important physiological events. Exogenously application of Salicylic acid (SA) is useful for the growth and development of plants. This investigation aimed to study the improving effect of salicylic acid on the tissue culture of Ziziphus spina-christi. To study its improving effect were used shoot-tip explants cultured on Murashige and Skoog (MS) solid medium supplemented with different concentrations and various combinations of auxins, cytokinins and Salicylic acid. Media without growth regulators enhanced the growth and elongation of shoot-tip explants not its proliferation. Lower concentrations of cytokinin were better for shoot-tip proliferation than higher ones. 6-Benzylaminopurine (BAP) was superior to kinetin (KN) in shoot-tip proliferation. The optimum culture conditions for shoot-tip proliferation were achieved on MS medium supplemented with 0.25 mg/l 6-Benzylaminopurine (BAP) and 25 mg/l Salicylic acid (SA). The optimum culture conditions for callus formation were obtained on MS medium supplemented with 3 mg/l 2,4-Dichlorophenoxyacetic acid (2,4-D) and 25 mg/l Salicylic acid (SA), while the optimum culture conditions for somatic callus formation were obtained on MS medium supplemented with 2.0 mg/l 2,4-Dichlorophenoxyacetic acid (2,4-D) and 10 mg/l Salicylic acid (SA). The optimum culture conditions for rooting of shoots were obtained on MS medium supplemented with 0.25 mg/l of Indole-3-butyric acid (IBA) and 10 mg/l Salicylic acid (SA). The highest percentage of survival plants was obtained in the soil mixture supplied with 10 mg/l Salicylic acid (SA). Salicylic acid (SA) showed positive effect and good response on callusing, shooting and rooting of Z. spina-christi. Cultures received small amounts of salicylic acid were better than those lack it.展开更多
文摘A procedure was studied on cryopreservation of Photinia serrulata shoot-tips in vitro by vitrification. The excised shoot-tips which were cultured for 30 d, 1.5～2.0 mm long, were loaded with 60% PVS2 for 40 min at room temperature in effendoff tube, then were exposed to PVS2 at 0 ℃ for 50 min. Followed by changing the solution with fresh PVS2, the tubes were immersed into LN2 directly. After 24 h storage, the effendoff tubes were rapidly thawed in the water bath at 40 ℃, the shoot-tips were washed twice with 1.2 mol·L -1 sucrose solution for 10 min and transferred onto MS medium supplemented with 6-BA 2.0 mg·mL -1 . The cultures were kept in dark for one week prior to exposure to the light. Survival rate of shoot-tips was 93.33% by TTC examination, and regeneration rate reached 41.67%.
基金Science and Technology Ground Plan Project of College and University in Jiangxi Province in 2013(KJLD13088)Agricultural Science and Technology Support Program of Science & Technology Department of Jiangxi Province(20122BBF60126)National Natural Science Fund in China(31360072)
文摘Salicylic acid (SA) is one of numerous phenolic compounds found in plants with numerous important physiological events. Exogenously application of Salicylic acid (SA) is useful for the growth and development of plants. This investigation aimed to study the improving effect of salicylic acid on the tissue culture of Ziziphus spina-christi. To study its improving effect were used shoot-tip explants cultured on Murashige and Skoog (MS) solid medium supplemented with different concentrations and various combinations of auxins, cytokinins and Salicylic acid. Media without growth regulators enhanced the growth and elongation of shoot-tip explants not its proliferation. Lower concentrations of cytokinin were better for shoot-tip proliferation than higher ones. 6-Benzylaminopurine (BAP) was superior to kinetin (KN) in shoot-tip proliferation. The optimum culture conditions for shoot-tip proliferation were achieved on MS medium supplemented with 0.25 mg/l 6-Benzylaminopurine (BAP) and 25 mg/l Salicylic acid (SA). The optimum culture conditions for callus formation were obtained on MS medium supplemented with 3 mg/l 2,4-Dichlorophenoxyacetic acid (2,4-D) and 25 mg/l Salicylic acid (SA), while the optimum culture conditions for somatic callus formation were obtained on MS medium supplemented with 2.0 mg/l 2,4-Dichlorophenoxyacetic acid (2,4-D) and 10 mg/l Salicylic acid (SA). The optimum culture conditions for rooting of shoots were obtained on MS medium supplemented with 0.25 mg/l of Indole-3-butyric acid (IBA) and 10 mg/l Salicylic acid (SA). The highest percentage of survival plants was obtained in the soil mixture supplied with 10 mg/l Salicylic acid (SA). Salicylic acid (SA) showed positive effect and good response on callusing, shooting and rooting of Z. spina-christi. Cultures received small amounts of salicylic acid were better than those lack it.
