HE Jiaqi,LU Shunjiao,REN Yu,et al.Physiology Response of Dendrobium ‘Sonia Hiasakul’ Seedling on Different Degrees of Low Temperature Stress[J].Northern Horticulture,2017,41(04):62-66.[doi:10.11937/bfyy.201704015]
秋石斛“三亚阳光”幼苗对不同程度低温胁迫的生理响应
- Title:
- Physiology Response of Dendrobium ‘Sonia Hiasakul’ Seedling on Different Degrees of Low Temperature Stress
- Keywords:
- Dendrobium; low temperature; cold tolerance
- 文献标志码:
- A
- 摘要:
- 以秋石斛“三亚阳光”幼苗为试材,采用人工模拟低温方法,研究了不同温度(15、10、5 ℃)和时间处理(1、2、4、8、24 h和2、4、8、16 d)下,秋石斛“三亚阳光”幼苗叶片的可溶性蛋白质、叶绿素、丙二醛(MDA)、游离脯氨酸4个生理指标的响应特征以及处理植株的黄叶率、落叶率及叶片恢复生长情况,以探讨低温胁迫对秋石斛的抗寒机制。结果表明:随着处理温度的降低和处理时间的延长,可溶性蛋白质含量变化波动性较大,呈先上升后下降再上升趋势,以15 ℃处理16 d最高,为356.96 μg?g-1;而MDA和游离脯氨酸含量逐渐升高,但递增的速度和幅度存在一定差异;叶绿素含量逐渐降低,以5 ℃处理16 d最低,为0.109 4 mg?g-1;秋石斛幼苗先出现大量黄叶后,出现落叶现象;从新生叶片数量上看,5 ℃下处理1~2 h可以促进新叶的萌发,且不影响植株正常生长。
- Abstract:
- Using the method of artificial simulation of low temperature,the four physiological indexes of Dendrobium ‘Sonia Hiasakul’ seedling leaves,including the soluble protein,chlorophyll,malondialdehyde (MDA) and free proline were measured to study the response of Dendrobium to different low temperature (15,10,5 ℃)and different times(1,2,4,8,24 hours and 2,4,8,16 days).Meanwhile,the situation of yellow leaves rate,defoliation rate and restoration of treantment plants were analyzed to discuss the effects of different temperature stress on cold resistance mechanism of Dendrobium.The results showed that with the decrease of treatment temperature and the prolonging of treatment time,the content of soluble protein fluctuated greatly and increased at first then decreased finally increased,and at 15 ℃,16 days treatment to the peak,356.96 μg?g-1;the contents of MDA and free proline gradually increased,nevertheless,there was a certain difference in the increasing speed and amplitude;the content of chlorophyll generally decreased,at 5 ℃,16 days to the lowest,was 0.109 4 mg?g-1.Dendrobium seedlings first appeared a large number of yellow leaves,then the yellows turned into fallen leaves.According to the number of newborn leaves,treatment of 5 ℃,1 or 2 hours could promote the germination of new leaves,and did not affect normal growth of plants.
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备注/Memo
第一作者简介:何嘉琦(1992-),女,海南海口人,硕士研究生,研究方向为植物抗逆生理。E-mail:hjqzmjcc@163.com.责任作者:尹俊梅(1968-),女,云南曲靖人,本科,研究员,研究方向为热带花卉种质资源与遗传育种。E-mail:yinjunmei2004@163.com.基金项目:中央级公益性科研院所基本科研业务费专项资助项目(1630032014014);海南自然科学基金面上资助项目(20163131)。