Promotion of Plant Growth by Bacterial ACC Deaminase

To date, there has been only limited commercial use of plant growth-promoting bacteria in agriculture, horticulture, and silviculture. However, with recent progress toward understanding the mechanisms that these organisms utilize to facilitate plant growth, the use of plant growth-promoting bacteria is expected to continue to increase worldwide. One of the key mechanisms employed by plant growth-promoting bacteria to facilitate plant growth is the lowering of plant ethylene levels by the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase. This article reviews the published work on this enzyme, with an emphasis on its biochemistry, protein structure, genes, and regulation. In addition, this article provides some initial insights into the changes in both plants and ACC deaminase-containing plant growth-promoting bacteria as a consequence of plant-microbe interactions. Finally, a brief discussion of how bacterial ACC deaminase and indoleacetic acid (IAA) together modulate plant growth and development is included.     

猪蛔虫生长发育与繁殖力的研究

经对猪蛔虫雌虫体长,体重,子宫瞬间怀卵总量,相对毓力测定,发现怀卵总量与体长,体重有密切关系,呈正相关,还发现相对繁殖力,以体重１．０１－３．００ｇ,范围最佳,繁殖能力最强。     

珍稀濒危植物蒙古扁桃花生物学特性

蒙古扁桃的植株可分为长花丝植株、短花丝植株和中花丝植株。群落花期约50d,单花花期约8d,分为露粉、微开、盛开、凋谢4个时期。过氧化物法测定4个时期花粉均具活力,可保持30d左右,联苯胺-过氧化氢测定柱头可授性,花粉活力与柱头可授性重叠,长花丝植株为8d左右,而中花丝约为5d。蒙古扁桃花一般在9:00开始泌蜜,11:00分泌量达到高峰,之后产蜜量减少直至停止,日泌蜜和散粉集中在10:00～14:00。蒙古扁桃开花受环境的影响。     

内蒙古阿鲁科尔沁国家级自然保护区景观动态及保护成效

快速评估自然保护区的保护成效,对科学地制定管理决策具有重要意义.本文通过遥感解译进行景观分类和景观动态变化分析,使用保护性景观质量指数、人工景观干扰指数和景观保护成效综合指数等开展内蒙古阿鲁科尔沁国家级自然保护区2004—2014年的保护成效研究.结果表明: 2004—2014年,该自然保护区内自然景观所占比例由92.2%增加到92.8%,天然草地和灌木林面积显著增加,但湖泊、河流快速减少;景观格局变化较大,主要景观类型面积转出率和转入率高,景观转类指数为0.33.自然保护区内各功能区的保护性景观及其占比均明显增加,保护性景观质量指数由24.37增长为25.36,景观质量得到提升.各功能区均存在不同程度的人工干扰,人工干扰景观面积增大;2004和2014年人工景观干扰指数分别为-0.79和-0.96,人工干扰强度变大.研究期间,内蒙古阿鲁科尔沁自然保护区的景观保护成效综合指数为3.5%,其景观保护成效达到“很好”,野生动植物生境趋于好转.     

紫茎泽兰提取物对四种储粮害虫的杀虫活性

紫茎泽兰提取物对米象、玉米象、绿豆象和蚕豆象等 4种储粮害虫成虫具有强烈的熏杀活性 ,用 4 4.4 4mg L的浓度熏蒸处理 4 8小时后 ,每种成虫死亡率均达到 1 0 0 .0 0 %。熏蒸毒力测定结果表明 ,紫茎泽兰提取物对上述 4种成虫 2 4小时的LC50 分别为 1 4 .65,1 2 .80 ,2 5.0 7和 1 2 .2 0mg L ,4 8小时的LC50 分别为 1 1 .79,9.67,1 3 .2 9和 9.76mg L。     

Localization and possible functions of phospholipase D isozymes

The activation of PLD is believed to play an important role in the regulation of cell function and cell fate by extracellular signal molecules. Multiple PLD activities have been characterized in mammalian cells and, more recently, several PLD genes have been cloned. Current evidence indicates that diverse PLD activities are localized in most, if not all, cellular organelles, where they are likely to subserve different functions in signal transduction, membrane vesicle trafficking and cytoskeletal dynamics.     

基于证据权重法的丹顶鹤栖息地适宜性评价

采用证据权重法对扎龙丹顶鹤栖息地适宜性进行评价.利用RS和GIS的空间分析功能,分别提取土地利用、植被、铁路、国道及居民点的信息,建立证据专题层,确定相应证据层的权重值,然后进行条件独立性检验,最后生成后验概率图.利用证据权重法可以客观定量地评价栖息地适宜性,同样,一个客观的栖息地适宜性评价模型可以评估生物多样性价值,管理和保护湿地,为决策者保护珍贵的栖息环境提供智力支持.     

滇南红厚壳种子油的脂肪酸成分

应用GC-MS联用技术对云南省西双版纳产的滇南红厚壳（Calophyllumpolyanthum）种子油的脂肪酸成分进行分析.检出12种脂肪酸成分,占总量的99.39%,主要是亚油酸（38.75%）,棕榈酸（22.42%）,油酸（22.11%）和硬脂酸（9.81%）.