| 摘要: |
| 为探讨盐胁迫下两类不同地区藜麦品种幼苗的耐盐机制,该文利用不同浓度的NaCl溶液,对来自青海省海东市乐都区的‘LD-13'(低盐地区)和来自青海省海西州乌兰县的‘WL-192'(高盐地区)的2个藜麦品种的种子和幼苗进行盐胁迫处理,研究了种子萌发指标(发芽率、发芽势、发芽指数),生长指标(鲜重、根长、茎长)及生理指标(MDA含量及SOD、POD、CAT活性)等的变化。结果表明:低浓度盐(NaCl浓度小于250 mmol·L-1)胁迫下,2个藜麦品种种子的萌发、幼苗生长及生理活性表现均较适宜; 但中、高浓度盐(NaCl浓度大于250 mmol·L-1)胁迫下,其种子萌发、生长及幼苗生理活性均受到不同程度的抑制。从耐盐性综合评价值D值来看,虽然同为山谷型的藜麦品种,但适应盐碱地栽培的‘WL-192'品种比低盐土壤中生长的‘LD-13'品种更耐盐。推测‘WL-192'比‘LD-13'耐盐性除了受选育地区土壤盐度的影响外,还可能与品种自身及光周期、温度、海拔、纬度等外部生长环境等因素有关。结合青海西部地区气候环境和盐碱土地资源开发利用,‘WL-192'品种更适合在青海地区推广种植。 |
| 关键词: 藜麦, NaCl胁迫, 幼苗生长, 生理特性, 耐盐性 |
| DOI：10.11931/guihaia.gxzw201907033 |
| 分类号:Q945 |
| 文章编号:1000-3142(2021)05-0823-08 |
| Fund project:中国科学院种子创新研究院项目(INASEED); 海西州财政支持农业项目(HXNM001); 青海省种子工程项目(2019016); 青海省重点研发与转化计划项目(2019-NS-045)[Supported by the Innovative Academy of Seed Design(INASEED); Financial Support Agriculture Program of Haixi Prefecture(HXNM001); Qinghai Seed Engineering Program(2019016); Key R & D and Transformation Program of Qinghai Province(2019-NS-045)]。 |
|
| Response of seedling growth and physiological characteristics of Chenopodium quinoa under NaCl stress |
|
QUAN Youjuan1,2, YUAN Feimin3, LI Xiang1,2, LIU Demei1, CHEN Zhiguo1*
|
|
1. Northwest Plateau Institute of Biology, Chinese Academy of Sciences/Key Laboratory of Adaptation and Evolution, Chinese Academy of Sciences/
Key Laboratory of Crop Molecular Breeding in Qinghai Province, Xining 810008, China;2. University of Chinese Academy of Sciences,
Beijing 100049, China;3. Northwest A &4.F University, Yangling 712100, Shaanxi, China
|
| Abstract: |
| In order to explore the mechanism of salt tolerance in seedlings of Chenopodium quinoa varieties in two different regions, the seeds of two C. quinoa varieties ‘LD-13'(low salt area)from Ledu District, Haidong City, Qinghai Province and ‘WL-192'(high salt area)from Wulan County, Haixi Prefecture, Qinghai Province were treated with different concentrations of NaCl solution to study the changes of seed germination indexes(germination rate, germination potential, germination index), growth indexes(fresh weight, root length, stem length)and physiological indexes(MDA content, SOD, POD, CAT activities). The results were as follows: Under the stress of low salt concentration(NaCl concentration less than 250 mmol·L-1), the seed germination, seedling growth and physiological activities of the two C. quinoa varieties were suitable. However, under the high salt concentrations(NaCl concentration > 250 mmol·L-1)stress, the seed germination, growth and seedling physiological activity were inhibited to varying degrees. According to the comprehensive evaluation value of salt tolerance, although the same valley type of C. quinoa varieties, ‘WL-192' variety adapted to saline-alkali soil were more salt-tolerant than ‘LD-13' variety which grown in low-salt soil. It is speculated that the salt tolerance of ‘WL-192' than ‘LD-13' may be affected not only by soil salinity, but also by varieties themselves, photoperiod, temperature, altitude, latitude and other external growth environment factors. Combined with the climatic environment and the development and utilization of saline-alkali land resources in the western region of Qinghai, ‘WL-192' variety are more suitable for popularization and cultivation in Qinghai. |
| Key words: Chenopodium quinoa, NaCl stress, seedling growth, physiological characteristics, salt tolerance |
