| 摘要: |
| 为探究盐旱胁迫下，远红光不同间断辐照次数及单次辐照时长对作物种子萌发及幼苗生长发育的影响，以水稻为试验对象，以聚乙二醇(PEG)和氯化钠(NaCl)溶液模拟干旱胁迫和盐胁迫，试验研究远红光补光条件下水稻生长发育的干旱界限值与盐害界限值；基于界限值设置盐旱交叉胁迫试验，以无远红光辐照为对照组，分别设计远红光间断辐照1~4次试验组及单次辐照时长5、10、15、20 min试验组，测算水稻种子发芽率、发芽势、发芽指数、幼苗根长、株高、茎粗、干物质量与叶绿素质量分数，比较远红光辐照对盐旱胁迫下水稻种子萌发及幼苗生长的影响。结果表明:PEG溶液模拟干旱胁迫的干旱界限值质量分数为18%，NaCl溶液模拟盐胁迫的盐害界限值浓度为0.05 mol/L。干旱、盐害界限值条件下，随着远红光间断辐照次数增加，水稻发芽率、发芽势、发芽指数分别增长了9.1%、10.5%和25.7%，根长、株高、茎粗分别增长了29.2%、7.2%和8.9%，干物质量与叶绿素质量分数分别增长了50.6%和85.8%。延长单次辐照时长，水稻发芽率、发芽势、发芽指数分别增长了10.2%、10.5%和34.3%，根长、株高、茎粗分别增长了91.6%、14.4%和7.8%，干物质量与叶绿素质量分数分别增长了48.8%与68.1%。增加远红光间断辐照次数及单次辐照时长可显著促进水稻种子萌发及幼苗生长发育。 |
| 关键词: 水稻 盐旱胁迫 远红光 LED光源 |
| DOI：10.11841/j.issn.1007-4333.2021.06.03 |
| 投稿时间：2020-09-07 |
| 基金项目:国家自然科学基金项目(21875058) |
|
| Effects of far red light irradiation on the germination and seedling growth of rice under salt and drought stress |
|
ZHU Mei1,LI Xinyu1,ZHANG Tiantong1,CHEN Lei2*
|
| (1.School of Engineering, Anhui Agricultural University, Hefei 230036, China;2.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China) |
| Abstract: |
| Under salt and drought stress, the effects of different far red light irradiation scenarios on rice seed germination and seedling growth were investigated. Rice was selected as the experimental object. NaCl solution and polyethylene glycol(PEG)were set as salt stress and drought stress, respectively. Under the condition of far red light, the critical values of drought and salt damage for rice growth and development were obtained. Then a cross stress of salt and drought was set according to the threshold value of drought and salt damage. There was no far red light irradiation in the control group. The experimental groups of intermittent far red light irradiation for 1-4 times and single irradiation for 5, 10, 15 and 20 minutes were designed, respectively. The germination rate, germination potential, germination index, root length, plant height, stem diameter, dry matter quantity and chlorophyll content of rice seeds were measured. The effects of far red light irradiation on rice seed germination and seedling growth under salt and drought stress were compared. The results showed that: The drought threshold of PEG solution was 18%, which was expressed by mass fraction. The drought threshold of NaCl solution salt stress was 0. 05 mol/L, which was expressed by the concentration of NaCl solution. The salt and drought environment was set as the above threshold. When the far red light irradiation times are increased, the germination rate, germination potential and germination index of rice increased by 9. 1%, 10. 5% and 25. 7%, the root length, plant height and stem diameter of rice increased by 29. 2%, 7. 2% and 8. 9%, and the dry matter quantity and chlorophyll content of rice increased by 50. 6% and 85. 8%. When the duration of single irradiation is prolonged, the germination rate, germination potential and germination index of rice increased by 10. 2%, 10. 5% and 34. 3%, the root length, plant height, stem diameter of rice increased by 91. 6%, 14. 4% and 7. 8%, and the dry matter quantity and chlorophyll content of rice increased by 48. 8% and 68. 1%. Therefore, increasing the number of far red light irradiation times and single irradiation time can significantly promote rice seed germination and seedling growth. |
| Key words: rice salt drought stress far red light LED light source |
