Physiological responses of three cultivar seedlings of Bougainvillea under drought stress

该研究对勤花三角梅(Bougainvillea buttiana Miss Manila')、樱花三角梅(B.glabra Imperial; Delight')和金心鸳鸯三角梅(B.peruviana; Thimma')三个三角梅品种的幼苗进行人工干旱胁迫,分析了干旱胁迫对三角梅品种的外观形态和生理生化水平的影响,探讨了不同品种三角梅对干旱胁迫的; 适应能力。结果表明:随着干旱时间的延长,三角梅品种的叶片出现下垂、皱缩、变黄、脱落,最后植株死亡;过氧化物酶POD活性先升高后降低,而超氧化物歧; 化酶SOD活性则逐渐降低,降低速度因品种而异;qP值降低、qN值升高、PSⅡ反应中心光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)均呈现; 降低。该研究结果为三角梅的栽培应用和品种选择提供了依据。Seedlings of Bougainvillea buttiana Miss Manila', B.glabra Imperial; Delight' and B.peruviana Thimma' were treated to study the physiological; responses under drought stress.The results showed that the plant leaves; began to droop, gradually shrink, yellow in color, and fell off, all of; the treatment seedlings died finally under the long drought.The results; showed that the peroxidase activities(POD) were increased at beginning,; and decreased finally, while the superoxide dismutase(SOD) activities; were gradual decreased, but the reduction rates were different in the; three cultivar seedlings.The research on chlorophyll fluorescence; parameters showed that qP value was decreased, while qN value was; increased, and the photochemical efficiency of PSⅡreaction center(Fv/Fm); and potential activity of PS Ⅱ(Fv/Fo) were decreased under drought; stress.This study provides information for breeding application and; choosing ulltivars of Bougainvillea.厦门市科学技术局资助项

The Resistance Research and Application of Typical Plants for Island Vegetation Restoration

植被是海岛生态系统的重要组成部分，海岛植被修复对加快恢复受损的海岛生态环境，改善海岛居民的生活生产条件起关键作用。目前，我国大部分海岛生态破坏比较严重，而海岛植被修复工作起步较晚，海岛植被修复技术还不完善，对环境恶劣海岛植被修复依然缺乏良策。本文依托平潭海岛景观生境修复技术研究与示范项目，以木麻黄（Casuarinaequisetifolia）、夹竹桃（Neriumindicum）和台湾相思（Acaciaconfusa）为实验材料，室内人为控制干旱胁迫、根系盐胁迫和叶片盐胁迫的程度及时间，研究典型海岛植物抗逆性，筛选耐旱耐盐树种，提出立地条件困难海岛的植被修复技术，相关研究成果应用于塘屿植被修...Vegetation is an important component of the island ecosystem. The island vegetation restoration plays a key role in accelerating the damaged island ecological environment to recovery, and fine vegetation can also improve the island residents’ living and production conditions. At present, most of the island ecosystems are severely damaged. However, the island vegetation restoration starts late in C...学位：理学硕士院系专业：海洋与地球学院_物理海洋学学号：2232013115135

塔里木河下游地下水位对柽柳叶绿素荧光特性的影响

选取塔里木河下游3处地下水埋深>6m的监测井位作为研究点,结合典型生态监测断面的地下水位监测数据,分析不同地下水埋深处柽柳的叶绿素荧光特性和光系统的光合活性.结果表明:随着地下水埋深加大和干旱胁迫加剧,柽柳叶片的实际光化学效率、电子传输速率和光化学猝灭等参数普遍下降;非光化学猝灭和调节性能量耗散量子产量等参数显著升高,而最大光量子产量总体处于相对适宜状态.干旱胁迫下柽柳的PSII光合活性随地下水埋深增大而下降,捕获光能的过剩程度加剧,发生光抑制的几率增大,其自身良好的抗旱性和自我调节机制,使光系统II尚未发生显著光损伤

Effect of Drought Stress on the Characteristics of Transpiration of 4 Plants

在温室条件下研究类芦等4种植物在干旱胁迫下的蒸腾特性。结果表明,在正常供水情况下,4种植物蒸腾速率和气孔阻力日变化规律明显;在干旱胁迫下,气孔阻力增大,蒸腾速率逐步降低,当水势下降到临界值时,气孔关闭,气孔阻力急剧增大,蒸腾速率降至最低。4种植物中,类芦的水分利用效率最高,其次为百喜草和香根草,五节芒最低。4种植物的抗旱力以类芦最强,百喜草和香根草其次,五节芒最弱。Based on the condition controlling in the green house,the effect of drought stress on the characteristics of transpiration water consumption of 4 plants were tested.The results showed that 4 species examined had clearly daily variation in transpiration and stomatal resistance.The transpiration rate drop gradually and stomatal resistance increased under the condition of drought stress.When water potential dropped to some critical level,stomatal increased sharply and the transpiration rate decreased to lowest level as stomatal close.Neyraudia reynaudiana was of high drought tolerance with high water use efficiency under different water supply,while Miscanthus floridulus is of low,and the drought resistance ability of Paspalum notatum and Vetiveria zizanioides were ranked between the two species

The study of water-saving and green-maintaining technique by means of chemical regulation for Eremochloa ophiurodes turf management

草坪草普遍蒸腾耗水量大，且暖季型草坪草不耐冬季低温，枯黄期长，这是草坪养护管理中存在的两个主要问题。本研究以园林上广泛应用的暖季型草坪草假俭草为材料，采用盆栽和野外实验相结合筛选高效抗旱及促越冬期生长的配方，为城市草坪草养护提供配套的节水、节能及提高景观质量的管理技术。 在假俭草抗旱节水技术的研究上，本文首先探讨了干旱胁迫下假俭草各生长生理指标动态变化。结果表明，干旱处理10d后，未喷施药剂的假俭草叶绿素含量急剧下降，叶片游离脯氨酸含量和可溶性糖含量迅速增加，膜脂过氧化产物MDA大量积累，开始呈现干旱胁迫临界期生理变化症状，而喷施外源药剂（水杨酸、CPPU）可使假俭草干旱胁迫的临界期由10d...Turf often consumes large quantity of water through its strong leaf transpiration. Meanwhile, warm-season turfgrass is subjected to cold-stress, wither and turn yellow during winter. In order to solve these problems, this research foucus on exploring the corresponding techniques to reduce the water-consuming as well as to improve the overwintering landscape quality of urban gardening turf. Eremoch...学位：工学硕士院系专业：海洋与环境学院环境科学与工程系_环境工程学号：2262006115237

水分胁迫对生态恢复重要树种木荷与白楸幼苗的影响

采用盆栽控水试验,研究了水分胁迫下我国亚热带地区森林演替过程中的重要树种木荷(Schima superba)和白楸(Mallotus paniculatus)的幼苗叶片叶绿素、类胡萝卜素、SOD活性、POD活性、脯氨酸和MDA含量的变化.结果表明:在干旱胁迫下,白楸叶片SOD活性、POD活性、脯氨酸和MDA含量在22%土壤相对含水量下均出现剧增,而Chla、Chlb和Car含量在22%的土壤相对含水量下则均出现降低;在同样的干旱胁迫下,木荷叶片SOD活性、POD活性和脯氨酸含量在19%的土壤相对含水量下才出现增加,而Chla、Chlb和Car含量则变化不大.在轻度淹水胁迫下,白楸叶片SOD活性、POD活性、脯氨酸和MDA含量基本呈增加趋势,而Chla、Chlb和Car含量呈降低趋势;木荷叶片SOD活性、POD活性和脯氨酸含量在同期规律不明显.相关分析表明,白楸叶片SOD活性同脯氨酸含量变化呈显著正相关(r=0.815,p<0.05)和MDA含量的变化呈极显著正相关(r=0.932,p<0.01).由此说明,水分胁迫下,白楸比木荷敏感,木荷的耐受力强于白楸

Research on the function of ANAC084 in Arabidopsis thaliana in response to the environmental stress

ANAC084是NAC转录因子家族的一员，其编码一个206个氨基酸的小蛋白。在拟南芥中过表达ANAC084植株出现地上部分变小，莲座叶面积变小、颜色加深，生长周期偏长的表型，但是根的发育并不受影响，进一步的研究表明过表达ANAC084会使拟南芥叶片细胞变小同时使叶片细胞数量大大减少，从而造成植株变小。但是ANAC084-RNAi和ANAC084-SRDX植株在表型上和野生型没有明显区别。通过对ANAC084Pro:gANAC084:GFP:GUS植株进行GFP扫描和GUS染色研究ANAC084的表达模式，我们发现ANAC084在胚胎发育时期就已经开始表达，并且在整个胚中都有表达，到胚后发育时期...ANAC084 is a member of NAC transcription factor family, coding a small protein which contains 206 amino acids. Overexpression of ANAC084 in Arabidopsis causes a dwarf phenotype, the smaller and darker rosette leaves, and longer growth cycle in comparison with the wild type plants, but the growth of root are not affected. Further research shows that overexpression of ANAC084 not only diminish the l...学位：理学硕士院系专业：生命科学学院_发育生物学学号：2162013115252

"百闻不如一见!" -- NMT视频资源介绍

非损伤微测技术(NMT)作为生命科学领域的关键核心技术,已帮助中国科研学者在包括Cell、Nature、Science 等在内的各类学术期刊上发表各类文献超过1200 篇,但由于NMT 目前依然属于普及度不高的新技术,初次接触NMT 的研究人员,需要花费较高地时间成本来收集NMT 相关资料,以了解并学习NMT 的使用。 为了能够让研究者们更系统、高效地学习NMT,我们汇总了国内NMT 领军企业旭月公司及超过1000 位的中国科研学者和工程技术人员,在近二十年的时间里总结出的应用经验和体系视频资源,其中包括技术介绍、技术应用报告、技术应用案例、实验流程等

A study on differently expressed proteins of thylakoid membrane in plant adaption to environmental stresses

本研究以河西走廊4种不同生态型芦苇：水生芦苇（swampreed，SR）、轻度盐化草甸芦苇（lightsaltmeadowreed，LSMR）、重度盐化草甸芦苇（heavysaltmeadowreed，HSMR）、沙丘芦苇（dunereed，DR）及典型C4植物玉米为实验材料，采用蓝绿温和胶电泳（BN/SDS-PAGE）及免疫杂交（Wstern-Blotting）技术，研究了自然逆境胁迫和渐进干旱胁迫对植物叶片类囊体膜相关生理指标的影响及类囊体膜蛋白质组的变化，以期发现植物响应环境变化过程中类囊体膜蛋白组分的差异表达特点，为进一步揭示植物逆境响应过程中的光合调节机制提供依据。获得的主要结果如下...The effects of natural drought and salinity as well as progressive drought stress on physiological characteristics and protein components of thylakoid memebrane were studied by using blue native PAGE and Western-blot. Four ecotypes of reed, referred to as swamp reed (SR), dune reed (DR); heavy salt meadow reed (HSMR) and light salt meadow reed (LSMR) growing in the desert region of north-western C...学位：理学硕士院系专业：生命科学学院生物学系_发育生物学学号：2012005130205

碳稳定同位素技术在植物水分胁迫研究中的应用

植物体的碳稳定同位素组成主要由植物本身的生物学特性决定, 但环境胁迫对其影响也十分明显。综述了碳稳定同位素 技术在研究植物水分利用效率、生物量高低及判断历史气候依据等研究领域的进展, 阐明了植物体的D13C 值对干旱、盐分及其 它环境因素的变化所引起的水分胁迫的响应, 并对碳稳定同位素对水分胁迫的响应机理进行了归纳和推断