Subjects: Biology >> Botany submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
Erodium oxyrrhynchum is a dominant hygroscopic plant in Gbandonggut Desert, which can be germinated in different seasons. In this research, the biological, physiological, and biochemical characteristics of its parent plants and seeds were analyzed, and the phenotypic plasticity and reproductive strategy differences of hygroscopic seedlings were investigated. Results showed that (1) autumn-germinated plants of E. oxyrrhynchum can resist stress injury by accumulating proline and soluble sugar in winter. (2) In the stress environment, springgerminated plants were primarily dependent on SOD and CAT to clean up the toxicity caused by ROS, whereas autumn-germinated plants were primarily dependent on POD and CAT to clean up the toxicity. (3) The comprehensive evaluation of resistance showed that the resistance of autumn-germinated plants was higher than that of spring-germinated plants. (4) The number of seeds per autumn-germinated plant was over 60, and the 100- seed weight was 0.323 ± 0.0026 g. The number of seeds per spring-germinated plant was approximately 20, and the 100-seed weight was 0.376 ± 0.0014 g. (5) Correlation analysis of various indexes of seeds of spring/autumngerminated plants showed that under high and low-temperature stress, the content of the four kinds of seed included in this study was significantly and positively correlated with the antioxidant enzyme system. In addition, the BR content of seeds of spring-germinated plants was significantly and negatively correlated with three antioxidant enzymes, whereas the BR content of seeds of autumn- germinated plants was significantly and positively correlated with the antioxidant enzyme system. (6) Analysis of the seed character network showed that continuous high and low-temperature stress affected the complexity of the seed network of E. oxyrrhynchum, and the complexity of the seed network of spring- germinated plants was higher than that of autumn- germinated plants. Under stress, the physiological and biochemical indexes of the seeds of spring- germinated plants were strongly correlated. In general, autumn-germinated plants of E. oxyrrhynchum had stronger resistance, and they tended to produce more and smaller seeds. Therefore, the progeny can have more genetic diversity, and it can improve the adaptability of the species to the environment. Spring-germinated plants were less resistant, and they produced fewer seeds with high quality and stability, which could improve seedling establishment under stress
Subjects: Biology >> Botany submitted time 2022-03-28 Cooperative journals: 《干旱区研究》
Abstract：葱属（Allium Linnaeus）植物是具有重要价值的植物资源。中国新疆地区位于亚欧大陆腹地，地处亚洲中部，且具有丰富的葱属植物多样性。查证葱属植物相关书著、文献资料及标本信息记录，探讨新疆葱属植物资源及其区系地理特征，为该属植物的系统分类、生物多样性保育以及资源合理开发利用等方面提供参考。依据已有的葱属相关记录和资料，新疆葱属植物有58种、1亚种、2变种、6栽培种。新疆分布的葱属植物的区系地理特征：（1）新疆葱属植物的分布地域主要集中在天山、伊犁塔城、阿勒泰、喀什地区，新疆葱属植物多生长于荒漠、草原、干旱坡地、砾石地、山地、高山、林下（森林）生境；（2）在地理成分的分布区类型中，新疆葱属植物主要分布在II C5b准噶尔亚地区，II C5b的区系属于温带荒漠性质；ⅠA2 阿尔泰地区、ⅡC5a 塔城伊犁亚地区、ⅠA3 天山地区、ⅡC6c 喀什亚地区也相对较多；（3）在新疆植被区划的系统单位类型中，新疆葱属植物分布在ⅠB1（阿尔泰山-北塔山草原省）、ⅡA2（东天山北坡草原云杉林及高山草甸植被省）、ⅡA1（准噶尔盆地半灌木荒漠植被省）、ⅡB3（天山南坡荒漠及山地草原植被省）植被省的种类较多，其次是ⅡB1（东疆砾质戈壁灌木荒漠植被省）、ⅠA1（准噶尔盆地西部山地草原省）、ⅡB2（塔里木盆地灌木荒漠植被省）植被省，分布在ⅡB4（帕米尔-昆仑-阿尔金山地荒漠与高山草原植被省）、ⅠC1（新疆南部高寒草原省）植被省的种类相对较少；（4）新疆葱属植物的水平分布和垂直分布均存在分异；（5）新疆葱属植物与哈萨克斯坦、俄罗斯的共有种较多，中国新疆地区与哈萨克斯坦、俄罗斯之间的葱属植物共有种数无太大差异且共有种的相似度较高。今后还应综合分子系统发育（植物系统发育区系地理学）、演化历史（历史植物地理学）、分子生物地理学等方面进行纵深研究。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2021-01-26 Cooperative journals: 《干旱区研究》
Abstract：尖喙牻牛儿苗种子生物学特性对于其在极端环境的生存和繁衍具有重要意义。分别采集尖喙牻牛儿苗春萌和秋萌植株的种子为实验材料，通过室内模拟与野外实验相结合,探讨尖喙牻牛儿苗种子百粒重、吸水率和种子萌发等生物特征方面的差异性。结果表明：（1）秋萌植株种子成熟时间比春萌植物早一周左右，两者在不同成熟散布时间下的种子百粒重有显著性差异。（2）未划破种皮下，春萌和秋萌的尖喙牻牛儿苗植株种子在25 ℃/10 ℃具有最高的萌发率，划破种皮后，15 ℃/5 ℃，20 ℃/5 ℃，25 ℃/10 ℃温度下萌发率均达到80%以上且与其他温度条件具有显著的差异。（3）春萌植株种子的吸水率和自然萌发率均显著高于秋萌植株且光照对于春萌和秋萌植株种子萌发影响不显著。（4）尖喙牻牛儿苗春萌和秋萌种子休眠类型为物理休眠，未划破种皮前，种子的萌发率均小于20%，而划破种皮后，萌发率均超过90%。
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