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苯甲酸钠对铜、铅、镉胁迫下小麦幼苗生长及生理特性的影响
梁潘潘,赵晨,耿吉嘉,陈源,陈媛,陈德华,张祥
0
(扬州大学江苏省作物遗传生理国家重点实验室培育点,扬州 225009)
摘要:
以“扬麦16”为试验材料,研究苯甲酸钠对复合重金属胁迫下小麦幼苗生长及生理特性的影响。结果表明,2.4 mmol·kg-1复合重金属胁迫下,小麦出苗延迟,且幼苗生长受到显著抑制。与清水对照(处理0)相比,喷施2~4 g·L-1的苯甲酸钠溶液,小麦的叶绿素含量及叶绿素荧光参数Fv/FmFv/F0和根系活力显著增加(P < 0.01)。进一步分析发现,喷施2~4 g·L-1苯甲酸钠处理通过增加游离脯氨酸、可溶性蛋白含量和提高超氧化物歧化酶(SOD)活性缓解了小麦幼苗的毒害,最终降低叶片中丙二醛(MDA)含量,但喷施苯甲酸钠溶液浓度越高(>6 g·L-1)反而会抑制幼苗生长甚至对幼苗产生毒害。相关分析性表明,当苯甲酸钠施用浓度为1.97~3.12 g·L-1(2016年)、1.58~3.27 g·L-1(2017年)时,小麦叶绿素及其组分含量、根系活力、SOD活性、可溶性蛋白和游离脯氨酸含达最大值,当其浓度为2.59 g·L-1(2016年)、3.02 g·L-1(2017年),MDA含量最小。综上,喷施(1.58~3.27 g·L-1)的苯甲酸钠能减轻复合重金属胁迫对小麦幼苗的毒害。
关键词:  苯甲酸钠  复合重金属  小麦幼苗  生理特性
DOI:10.13610/j.cnki.1672-352x.20190717.004
投稿时间:2018-11-15
基金项目:国家重点研发计划(2017YFD0201300), 扬州大学校立院助研究生实践创新计划, 国家自然科学基金(31671613, 31471435), 江苏省博士后基金(1601116C), 江苏省高校优势学科建设工程和江苏高校品牌专业建设工程(PPZY2015A060)共同资助。
Effects of sodium benzoate on growth and physiological characteristics of wheat seedlings under Cu, Pb, Cd stress
LIANG Panpan,ZHAO Chen,GENG Jijia,CHEN Yuan,CHEN Yuan,CHENG Dehua,ZHANG Xiang
(Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009)
Abstract:
The effect of sodium benzoate on the growth and physiological characteristics of wheat seedlings under heavy metal stress was studied on “Yangmai 16”. The results showed that 2.4 mmol·kg-1 compound heavy metal significantly inhibited the growth of wheat seedlings and delayed wheat seedlings emergence. Under compound heavy metals stress, application of 2-4 g·L-1 sodium benzoate significantly increased (P<0.01) the chlorophyll content, the chlorophyll fluorescence parameters Fv/FmFv/F0, and the root activity of wheat,compared to the control (water treatment). Further analysis showed that application of 2-4 g·L-1 sodium benzoate alleviated the toxicity of wheat seedlings by increasing the contents of free proline, soluble proteins, and the activity of SOD (Superoxide Dismutase), and reducing MDA (Malondialdehyde) content. In contrast, the higher concentration of sodium benzoate solution (>6 g·L-1) inhibited the growth of wheat seedlings and even caused damage to seedlings. The correlation analysis shows that when the sodium benzoate concentration was in the range of 1.97-3.12 g·L-1 (2016) and 1.58-3.27 g·L-1 (2017), the chlorophyll and its components, root activity, SOD activity, soluble protein, and free proline content were the highest. When the concentrations raised to 2.59 g·L-1 (2016) and 3.02 g·L-1 (2017), the MDA content was the smallest. In conclusion, the low concentration (1.58-3.27 g·L-1)of sodium benzoate could reduce the toxicity of compound heavy metals stress on wheat seedlings.
Key words:  sodium benzoate  compound heavy metals  wheat seedlings  physiological characteristics

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