共查询到20条相似文献，搜索用时 62 毫秒
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利用组织培养方法建立植物快速繁殖体系能很好地保存种质资源。该研究以矮晚柚无菌苗茎尖及子叶节为试验材料,采用正交设计L9,研究基本培养基、激素配比对腋芽萌发、芽增殖及壮苗的影响。结果表明：最适材料为无茵苗子叶节,最佳腋芽诱导方案为I／2MS＋6-BA0．5mg／L＋NAA0．05mg/L＋GA31．0mg／L,丛生单芽在增值培养基1／2MS＋6-BA0．5mg／L＋NAA0．05mg／L的平均增殖系数达到5．8,最佳壮苗培养基为1／2MS＋6-BAO．5mg／L＋NAA0．1mg／L。 相似文献
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为了降低迷你型黄瓜的种苗成本,对迷你型黄瓜的不定芽的快繁技术进行了研究．以MS为基本培养基,研究了不同的激素处理对迷你型黄瓜离体子叶不定芽的诱导、增殖与生根的影响．结果表明：以MS＋0．3mg／L6-BA＋0．05mg／LIAA为培养基诱导不定芽的效果较好,以MS＋0．2mg／L6-BA＋0．05mg／LIAA为培养基的增殖效果较理想,以1／2MS＋0．2mg／LIAA为培养基的生根效果较好,生根率达98％,且根系发达． 相似文献
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白网纹草组织培养快繁研究 总被引：1，自引：0，他引：1
以白网纹草的带芽茎段为外植体，将其接种在附加不同浓度激素的MS培养基上。试验结果表明：最佳启动培养基为MS＋6-BA0．5mg／L＋IBA0．2mg／L，最佳增值培养基为MS＋6-BA0．2mg／L＋IBA0．1mg／L，生根的适宜培养基为1／2MS＋NAA0．2mg／L，同时还发现将生根培养基中的蔗糖换成白砂糖，对生根效果影响不大。 相似文献
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牡丹鳞芽离体培养的初步研究 总被引：4，自引：0，他引：4
以“银粉金鳞”鳞芽为材料进行离体培养,研究了植物生长调节剂6-BA和NAA对鳞芽不定芽诱导分化、增殖培养的影响．结果表明：MS＋Ca^2＋ ＋6-BA1．0mg／L＋NAA0．3mg／L为丛生芽诱导最佳培养基,诱导率高达81．67％;MS＋Ca^2＋ ＋6-BA1．6mg／L＋NAA0．2mg／L为最佳增殖培养基．增殖系数为3．21． 相似文献
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用百合叶片及其鳞茎叶片离体诱导不定芽 总被引：1，自引：0，他引：1
以MS为基本培养基，附加不同浓度配比的NAA、6-BA、TDZ、2．4-D等激素，分别对5种百合的鳞片叶和叶片进行培养．结果显示，叶片经MS TDZ0．5mg／L和MS 2．4-D0．2mg／L TDZ2．0mg／L诱导可产生不定芽，诱导率最高为20％．MS NAA0．03mg／L、MS NAA0．05mg／L和MS 6-BA2．0mg／L 2．4-D0．2mg／L的培养基都不同程度诱导鳞片叶产生多个不定芽。以MS NAA0．05mg／L芽诱导率最高，不定芽经过继代培养，可长出新鳞茎． 相似文献
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以玫瑰茎尖为外植体进行组织培养试验研究结果表明：玫瑰茎尖在MS＋6BA1mg／L＋NAA0．1mg／L＋3％白糖＋0．4％琼脂的培养基中芽的诱导率高达98％；在MS＋6-BA2mg／L＋NAA0．01mg／L＋3％白糖＋0．4％琼脂的培养基中增殖倍数可达6，且苗壮；在1／2MS＋IBA0．5mg／L＋0．3％活性炭＋3％白糖＋0．4％琼脂培养基中根系生长丰富且健壮，诱根率高达100％；试管苗移栽基质为珍珠石＋腐殖土，成活率达98%． 相似文献
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以牡丹花石榴树春季新抽生的未木质化的嫩枝条芽段为试验材料，研究了牡丹花石榴的组织培养技术。6-BA的浓度是决定牡丹花石榴腋芽能否萌发的关键因素，适宜牡丹花石榴腋芽萌发与继代繁殖的培养基为“MS＋6-BA1．0mg／L＋IBA0．2mg／L”。适合牡丹花石榴芽丛壮苗培养基为“MS＋KT0．5mg／L＋IBA0．2mg／L”。适合牡丹花石榴嫩茎生根的培养基为“1／2MS＋IBA0．5mg／L”。 相似文献
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以菊花的花瓣作外植体进行组培快繁技术研究，结果表明：外植体用0．1％升汞消毒10min为宜；诱导愈伤组织的最佳培养基为MS＋6-BA1．5mg／L＋NAA0．1mg／L；丛生芽形成的最佳培养基为MS＋6-BAl．5mg／L＋NAA0．1mg／L；用1／2MS＋NAA0．5mg／L作生根培养基，生根率可达100％。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献