The effect of ethylene inhibitors （AgNO3, AVG）, an ethyleneliberating compound （CEPA） and aeration on the formation of protocorm-like bodies of hybrid Cymbidium （Orchidaceae）

Protocorm-like bodies （PLBs） or thin cell layers （TCLs） derived from PLBs of hybrid Cymbidium Twilight Moon ＇Day Light＇ can induce new or neo-PLBs on Teixeira Cymbidium （TC） medium, which contains 0.1 mg/L a- naphthaleneacetic acid, 0.1 mg/L kinetin, 2 g/L tryptone and 20 g/L sucrose, and is solidified with 8 g/L Bacto agar. This study aimed to assess the response ofneo-PLB formation to an ethylene-liberating compound （2-chloroethylphosphonic acid （CEPA））, to two ethylene inhibitors （silver nitrate （AgNO3） and aminoethoxyvinylglycine （AVG））, and to aeration （made possible by using Milliseal~ or autoclaved filter paper）. AgNO3 at 1 or 2 mg/L in TC medium significantly increased the fresh weight of PLBs while 1 mg/L of AgNO3 also showed a significant increase in the number ofneo-PLB from both half-PLBs and from tTCLs. In contrast, AVG and CEPA inhibited neo-PLB formation. Neo-PLB formation from half-PLB or TCL explants in the presence of aeration resulted in significantly lower neo-PLB weight. The use of AgNO3 and aeration are alternative means to mass produce neo-PLBs for micropropagation purposes.     

Alpha-picolinic Acid Activates Diverse Defense Responses of Salicylic Acid-, Jasmonic Acid／Ethylene- and Ca^2 -dependent Pathways in Arabidopsis and Rice Suspension Cells

Alpha-picolinic acid (PA) is an apoptosis inducer in animal cells, and could elicit hypersensitiv eresponse (HR) in rice, a monocotyledonous model plant. Here we report that PA is an HR inducer in plants. It induced HR in Arabidopsis, a dicotyledonous model plant, including the oxidative burst and cell death. We investigated defense signal transduction activated by PA through marker genes of particular defense pathways in Arabidopsis. The result indicated that both the salicylic acid-dependent and jasmonic acid/ethylene-dependent pathways were activated by PA, in which the marker defense genes PR-1, PR-2 and PDF 1.2 were all induced in dose-dependent and time-course manners. We also observed that the PAinduced reactive oxygen species (ROS) production in rice suspension cells was Ca^2 -dependent. Together with our previous studies of PA-induced defense activation in rice, we conclude that PA acts as a nonspecific elicitor in plant defense and has a potential utilization in cellular model establishment of systemicac quired resistance (SAR) activation.     

烟草叶片外植体脱分化过程的调节及其与乙烯产生的关系

1ppm 2,4-D可诱导烟草叶片外植体脱分化产生愈伤组织,同时刺激产生乙烯,两者成正相关性;0.2ppm KT则直接诱导再分化产生不定芽,而对乙烯产生无明显影响。KT对2,4-D诱导脱分化和乙烯的产生均有显著的增效作用。亚胺环已酮(CHI)对2,4-D诱导脱分化和乙烯产生具有强烈的抑制作用。     

左氧氟沙星联合乙烯雌酚治疗老年性阴道炎疗效观察

随着我国人口逐步老龄化,老年妇女不断增加,老年性阴道炎的发病率逐年升高,严重影响老年妇女的生活质量及心身健康。我院自2008年1月～2012年1月,采用左氧氟沙星联合乙烯雌酚治疗老年性阴道炎,取得了满意的疗效,     

早熟桃果实和种子发育过程中乙烯产生及ACC含量和ACC氧化酶活 …

早熟桃果实在成熟前（授粉后３０￣４８ｄ）产生的乙烯极微，而此阶段种子生产的乙烯则相当高。果实乙烯大量产生前内果皮开裂。种子产生的乙烯可能是妄动早熟桃果实成熟的关键性因子。