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植物激素对基因表达具有重要的调控作用,生长素,细胞分裂素,赤霉素,脱落酸,乙烯等植物激素对基因表达调控作用的研究取得了不少进展。 相似文献
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提起植物激素,人们就会想到生长素,但现在已经知道植物体内除生长素外,还有其他四类物质也具有激素的作用,即赤霉素、细胞分裂素、脱落酸以及乙烯。尽管它们含量甚微,但作用却很大,影响植物的代谢,调节植物的生长发育过程。除天然的激素外,还有许多人工合成的化合物,它们与天然的植物激素的化学性质也很不相同,但对植物却具有与天然激素相类似的作用。如2,4—D、萘乙酸、矮壮素、坛产灵、三碘苯甲酸等,都是人工合成的药剂,具有类似激素的作用。通常人们把这类药剂与天然的植物激素,合称之为植物生长调节物质. 这里仅就天然的五类植物激素,生长素、赤霉素、细胞分裂素、脱落酸以及乙烯,分别作一简 相似文献
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在近几年的高考中,为了突出考查学生的探究能力,命题者以植物生长素的发现过程和生理作用为题材．利用实验设计等题型进行了多角度的体现为了帮助学生全面的理解植物激素,下面对赤霉素、细胞分裂素、乙烯和脱落酸等其他植物激素知识中探究性因素进行举例分析,供学习参考。 相似文献
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生长素、赤霉素、细胞分裂素、脱落酸和乙烯是举世公认的五类植物激素。每种激素虽然都有各自独特的生理功能,但作为一个整体,它们对细胞的分裂和伸长、组织器官的分化、植株的开花与结实、器官的成熟与衰老以及脱落和休眠等各种生理活动起着协同调节作用,有的互相促进,有的彼此抑制。归纳起来,这种协调关系主要表现在以下几个方面。一、增效作用即两种或两种以上的植物 相似文献
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植物激素在生产中的应用 总被引：1，自引：0，他引：1
李望 《连云港师范高等专科学校学报》1995,(2)
植物激素是植物自身产生的某些有机物质,它们在植物体内的量很少,但在植物的一生中对新陈代谢、生长发育等生理过程起重要的调节作用。 (一)植物激素的类型 目前已发现的植物激素有生长素、赤霉素、细胞分裂素、乙烯和脱落酸五种类型,化学结构如下: 相似文献
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生长素、赤霉素、细胞分裂素、脱落酸和乙烯是举世公认的五类植物激素。每种激素虽然都有各自独特的生理功能,但作为一个整体,它们对细胞的分裂和伸长、组织器官的分化、植株的开花与结实、器官的成熟与衰老以及脱落和休眠等各种生理活动起着协同调节作用,有的互相促进,有的彼此抑制。归纳起来,这种协调关系主要表现在以下几个方面。一、增效作用即两种或两种以上的植物激素混合使用时可起到互补提高效应。众所周知,赤霉素、生长素可以分别促进植株节间的 相似文献
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新课标人教版高中生物教材中对生长素和细胞分裂素的不同配比对植物组织培养过程中脱分化和再分化的影响有两段不完全一致的描述,选修三43页的叙述为:"当生长素含量高于细胞分裂素时,主要诱导植物组织脱分化和根原基的形成;而当细胞分裂素的效应高于生长素时,则主要诱导植物组织再分化和芽原基的形成."而选修一33页的叙述为:"生长素用量比细胞分裂素用量,比值高时,有利于根的分化、抑制芽的形成;比值低时,有利于芽的分化,抑制根的形成.比例适中时,促进愈伤组织的生长."在诱导外植体脱分化和再分化过程中这两种植物激素到底应该如何配比?下面结合一些实例给予分析总结,与同行交流. 相似文献
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植物生长调节剂对植物的生长发育有重要影响。本实验以模式植物拟南芥菜为材料,调查了外加生长素类和细胞分裂素类生长调节剂对拟南芥菜子叶、下胚轴和根生长的影响,使人们对植物生长调节剂在植物发育调控中的作用,以及在器官发育中的功能和作用的分子机理有更进一步的认识。 相似文献
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Plant tissue culture 总被引：1，自引：0，他引：1
H. R. Dagla 《Resonance》2012,17(8):759-767
The success of plant biotechnology relies on the fundamental techniques of plant tissue culture. Understanding basic biology of plants is a prerequisite for proper utilization of the plant system or parts thereof. Plant tissue culture helps in providing a basic understanding of physical and chemical requirements of cell, tissue, organ culture, their growth and development. Establishment of cell, tissue and organ culture and regeneration of plantlets under in vitro conditions has opened up new avenues in the area of plant biotechnology. 相似文献
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介绍植物组织培养技术在观赏植物高体快速繁殖、脱毒苗培育以及新品种培育中的应用现状及在未来观赏植物产业化生产中的应用前景． 相似文献
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“指”媒时代的高职校园网络文化,对高职院校的发展具有重要作用。校园网络文化建设工作涉及面广、技术性强、影响力大,对职教工作者提出了很高的要求。文章结合“指”媒时代的新契机与新要求,通过对高职院校校园网络文化的现状作调查分析,力求重构校园网络文化。 相似文献
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初步调查显示,影响我国学生出国留学的主要因素包括国外高校课程的质量和学校声望、留学的可能性、有机会提高英语水平与拓宽社交网络、体验西方文化、使个人获得发展以及移民。该调查还表明,英国高校成为留学首选地主要与英国高校的声望高、攻读硕士学位的年限短以及通行欧洲各国的便利等有关。 相似文献
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药用、食用、观赏用百合组培快繁研究进展 总被引：2，自引：0，他引：2
百合是商品价值很高的植物品种,有药用、食用、观赏等用途．应用植物种苗组织培养快速繁殖技术,可在短期内生产大量优质的百合种苗．现阶段国内广泛开展了对百合的组织培养和植株再生途径的研究,百合的组织培养研究已较为成熟,多种外植体都可诱导分化出植株．本文从外植体和基本培养基的选择、激素对初代、增殖及生根培养的影响、组培苗移栽等方面,综述了近年来国内的药用、食用、观赏用百合组培快繁研究的现状． 相似文献
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《园冶》造园理念能够对中职园林类专业学生学习专业课程起重要的指导作用。在园林植物应用课程中,教师应引导学生分析《园冶》关于植物造景的描述,还原场景,扩展设计,层层递进地学习植物知识、文化、配置,以及如何表达意境、内涵等,为学生掌握相关知识和技能发挥引导示范作用,提高学生的艺术修养。 相似文献
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The effect of two specific classroom climates on learning of science process skills and content achievement in college level science classes was studied. Two classroom climates were established and designated as discovery classroom climate (DCC) and nondiscovery classroom climate (NDCC). The term discovery denotes the degree of freedom the teacher established in classroom interactions, both verbal and nonverbal. Verbal interactions were monitored with the Science Laboratory Interaction Categories. These data indicate that students in the two classroom climates achieved equally as well on learning of biological content of the course, but students in the discovery classroom climate achieved significantly higher scores in science process skills as measured by the Welch Science Process Inventory. This study, conducted in a large, suburban community college, offers some useful information to the person who has educational goals beyond, but including, the learning of science information and concepts, and possibly science process. Students in the less directive discovery climate learned as much content as those in a more directive comparison class-they lost nothing of what is traditionally sought in a college science class. In addition, the discovery climate facilitated the development of science process skills which were significantly better than the comparison class. A five-week intensive class using the discovery climate was found to provide as much content acquisition as the ten-week nondiscovery climate. 相似文献
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王书润 《江苏经贸职业技术学院学报》2008,(1)
当前,高职院校把加强学生实践能力和职业技能的培养摆到了重要位置,但对人文素质教育却未给予应有的重视,在人才培养方面出现了"一手硬一手软"的现象。社会的发展对人才要素提出了一系列新要求,价值、道德、情感、文化、精神等构成文化软实力的因素关系到个人、社会乃至国家的成败。因此,应采取有力措施加强人文素质教育,提高高职院校学生的文化软实力。 相似文献
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Li-jun Ju Chong Zhang Jing-jing Liao Yue-peng Li Hong-yan Qi 《Journal of Zhejiang University. Science. B》2018,19(8):596-609
In plants, lipoxygenases (LOXs) play a crucial role in biotic and abiotic stresses. In our previous study, five 13-LOX genes of oriental melon were regulated by abiotic stress but it is unclear whether the 9-LOX is involved in biotic and abiotic stresses. The promoter analysis revealed that CmLOX09 (type of 9-LOX) has hormone elements, signal substances, and stress elements. We analyzed the expression of CmLOX09 and its downstream genes—CmHPL and CmAOS—in the leaves of four-leaf stage seedlings of the oriental melon cultivar “Yumeiren” under wound, hormone, and signal substances. CmLOX09, CmHPL, and CmAOS were all induced by wounding. CmLOX09 was induced by auxin (indole acetic acid, IAA) and gibberellins (GA3); however, CmHPL and CmAOS showed differential responses to IAA and GA3. CmLOX09, CmHPL, and CmAOS were all induced by hydrogen peroxide (H2O2) and methyl jasmonate (MeJA), while being inhibited by abscisic acid (ABA) and salicylic acid (SA). CmLOX09, CmHPL, and CmAOS were all induced by the powdery mildew pathogen Podosphaera xanthii. The content of 2-hexynol and 2-hexenal in leaves after MeJA treatment was significantly higher than that in the control. After infection with P. xanthii, the diseased leaves of the oriental melon were divided into four levels—levels 1, 2, 3, and 4. The content of jasmonic acid (JA) in the leaves of levels 1 and 3 was significantly higher than that in the level 0 leaves. In summary, the results suggested that CmLOX09 might play a positive role in the response to MeJA through the hydroperoxide lyase (HPL) pathway to produce C6 alcohols and aldehydes, and in the response to P. xanthii through the allene oxide synthase (AOS) pathway to form JA. 相似文献