共查询到20条相似文献，搜索用时 281 毫秒
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多效唑是20世纪70年代末英国帝国（ICI）化学公司新开发的一种植物生长调节剂兼杀菌剂，属植物生长延缓剂，也叫抑制剂，它受到人们广泛关注，认为是迄今为止最好生长延缓剂之一。多效唑是一种高效、低毒的植物生长延缓剂，能增加植物体内的叶绿素、蛋白质和核酸的含量，降低赤霉素和吲哚乙酸的含量，增加乙烯的释放量，能控制花卉植株生长高度，使株形矮化、植株纵横生长变小、株型紧凑、叶片浓绿、生长健壮、长势旺盛；使盆景的顶枝生长慢，使树冠和枝叶保持原状不变，使花果盆景花艳果美。盆景每年只需喷洒1—2次即可，不但能省工省力， 相似文献
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辛酸和PP333对海桐的化学修剪和生理效应 总被引：14，自引：1，他引：13
辛酸叶面喷洒处理影响了海桐新梢的生长和侧枝的发生。0.04M和0.1M的辛酸对顶芽无伤害作用,但影响新梢的生长。0.2M和0.27M的辛酸杀死了新梢的顶芽,诱导了侧枝的发生,其中0.27M的辛酸对植株产生严重伤害。2000、4000和6000ppm的PP333处理抑制了新梢的生长。其抑制效果因浓度增加而加大。0.04和0.2M的辛酸与4000ppm的PP333混合处理也强烈抑制了新梢生长。PP333处理以及PP333和辛酸混合处理可长期保持植株的造型。 辛酸处理的植株在处理后第二年可恢复正常生长,4000、6000ppm的PP333以及0.1M、0.2M的辛酸和4000ppm的PP333混合处理的植株在处理后第二年生长仍受到抑制,90％以上的枝条在春季诱导开花,并在夏初结果。 辛酸和PP333处理改变了海桐茎尖过氧化物酶的活性,处理的植株酶活 性的增加和减少与新梢或侧枝的伸长生长呈相反趋势。 相似文献
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在福建省明溪县进行观赏型南方红豆杉重塑技术试验。结果表明:截干能够促进南方红豆杉地径生长,能够抑制植株高度及高生长,留干长度越短、缩剪程度越重其植株高度及高生长越小。截干不能影响植株冠幅,但缩剪强度能够显著抑制冠幅生长。截干可以促进南方红豆杉干上潜伏芽的萌发,且留干较长的萌蘖数量较多。截干能够促进新枝萌发,且留干较短且强度缩剪对新枝萌发数量有促进作用。截干对直立型、平展型新枝分化无明显影响,但留干长度较短且强度缩剪可以显著增加直立型新枝比例,减少平展型新枝比例。截干与否、截干高度以及缩剪强度对叶片色泽不存在明显作用。截干可提高植株的枝叶浓密度,留干较短且强度缩剪可进一步促进枝叶浓密。 相似文献
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多效唑对猕猴桃离体试管苗生长及内源激素的影响 总被引：18，自引：0，他引：18
多效唑（ＰＰ３３３）处理猕猴桃试管苗，降低了其生长强度；植株体内的ＧＡ３、ＩＡＡ和ＺＴ含量下降，ＡＢＡ的含量上升，乙烯释放率增加；并且能降低外源的ＧＡ３和ＩＡＡ促进生长的作用，而外源的ＧＡ３和ＩＡＡ又能不同程度地逆转多效唑的抑制作用，使植株恢复生长。 相似文献
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采用伤流液组分分析和植物营养分析的方法,探讨了不同铵硝配比（CK,0∶100;T1,10∶90;T2,25∶75;T3,50∶50）影响芥蓝生长的生理机制。结果表明：与全硝态氮营养液对照相比,3 个营养液增铵处理均提高了芥蓝植株的生物量和伤流强度,其中营养液增铵25%（T2）处理的效果最好。T1 处理芥蓝植株伤流液中蛋白态氮和P 的流量与CK 相比显著增加;T2 处理芥蓝植株伤流液中NO3--N、P、K 流量均为最高;T3 处理芥蓝植株伤流液中NH4+-N、氨基酸态氮和蛋
白态氮流量最高,而NO3--N 和K 流量则显著低于CK。T1 处理和T2 处理显著提高了芥蓝植株N、P、K 的含量和积累量;T3 处理亦显著提高了芥蓝植株N、P 的含量和积累量,但显著降低了K 的含量和积累量。综合来看,营养液适量增铵（25%）处理的效果最好,可以提高芥蓝根系吸收能力,促进氮代谢,增加植株对N、P、K 的吸收和积累,从而促进植株生长。 相似文献
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植物生长延缓剂在中国水仙上的矮化应用研究进展 总被引：1，自引：0，他引：1
概述了国内近二十几来对植物生长延缓剂在中国水仙上的相关研究，详细论述了植物生长延缓剂对水仙矮化处理方法、处理效果、矮化机理，并对植物生长延缓剂在中国水仙矮化处理方面存在的问题提出了建议。 相似文献
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Application of a 5-day dark treatment during the most active period of shoot growth of the tulip induced rapid elongation of the first internode. This treatment has been shown to be potentially useful for obtaining taller tulips for commercial cut-flower production. This treatment does not affect either the flowering date or other plant characteristics such as leaf length, flower length and colour, stem diameter or the total plant shape.Neither small light leaks, short periods of lighting, nor slight temperature fluctuations lessened the dark effect. Chemical treatments such as an application of gibberellins may also be combined with dark treatment as a forcing technique. 相似文献
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为了明确延长光照时间对厚皮甜瓜生长发育的影响,采用光通量密度为72μmol·m^-2·s^-1的人工光源对‘西州密25号’甜瓜植株进行不同时长的补光,研究了不同光照时间对甜瓜植株高度、茎粗度、叶片、节间长度、叶柄长度、叶绿素、保护酶、可溶性糖、果实的影响。结果表明延长光照时间有利于增加甜瓜植株高度、叶面积、茎粗度、节间长度、叶柄长度,提高其干物质的含量、根冠比、叶绿素含量,有利于保护酶POD、CAT活性的增加,促使可溶性糖含量减少,单果质量、可溶性固形物含量、果肉厚度增加,对果形指数影响不显著。延长光照时长4 h以上有利于‘西州密25号’植株的生长,延长光照8h‘西州密25号’果实单果质量可达380.83g,果实中可溶性固形物含量达到16.2%。 相似文献
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铜胁迫对蚕豆幼苗基因组DNA损伤效应的研究 总被引：1，自引：0，他引：1
采用AFLP分子标记技术,研究了Cu胁迫对蚕豆幼苗根系生长的影响和基因组DNA的损伤效应。结果表明:不同浓度(12.5、25、50 mg/L)Cu处理7 d后,蚕豆幼苗根长和根系内的可溶性蛋白含量均受到了抑制;基因组DNA的AFLP图谱发生显著变化,多态性增加,且与Cu浓度存在明显的剂量关系;Cu影响蚕豆幼苗根尖细胞基因组DNA的稳定性,利用AFLP技术获得的DNA多态性变化可作为土壤Cu污染的早期诊断。 相似文献
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通过喷施不同浓度的GA_3(以喷水为对照),记录初花和谢花日期,于盛花期时调查花枝长、花柄长、株高及叶片长宽比等生长指标,研究赤霉素处理对露地栽培切花月季‘卡罗拉’生长发育的影响。结果表明,不同浓度GA_3处理对其株高、花枝长、花柄长均具有不同程度的促进作用。300 mg·L~(-1) GA_3处理,平均花枝最长,叶片长宽比值最大;300和400 mg·L~(-1) GA_3处理,平均花柄最长;500 mg·L~(-1) GA_3处理,平均株高最高。对300 mg·L~(-1) GA_3处理的植株材料进行扫描电镜观察及RT-PCR分析结果发现,RhGA2ox、RhGA20ox、RhGA_3ox及RhGID1基因表达上调,表明促进了体内GA_3的积累,诱导了生长素合成相关基因的表达,导致植物细胞伸长、细胞体积增大,因而促进植株增高、叶片变长;开花相关基因RhAP1、RhKSN和RhSOC1的表达先上升后下降;RhAP1、RhFT和RhSOC1的表达,尤其是开花素基因RhFT在21 d时的高水平表达可能造成比对照提早开花;而RhKSN基因高水平表达抑制了开花基因表达导致开花期延长。 相似文献
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E. Berninger 《Scientia Horticulturae》1979,10(3):271-276
The effect on gerbera cultivar ‘Fredaisy’ of air and soil temperatures in the range 11–21°C has been studied in home-made growth-cabinets providing a sufficient thermal insulation between air and soil. Certain characteristics of the plants in cabinets were compared to those in a greenhouse.Amongst the growth characteristics, the length of the maturation period of the flower and the elongation rate during the early stage of the stem growth were more influenced by air temperature; the interval of appearance of new buds, the final stem length, and the elongation rate at the end of the stem growth, were more influenced by soil temperature.The elongation rates allowed a reasonably accurate prediction of the thermal zero of vegetation. 相似文献
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B. Jeffcoat 《The Journal of Horticultural Science and Biotechnology》2013,88(1):143-153
Foliar sprays of the synthetic cytokin, 6-benzylamino-9-(tetrahydropyran-2-yl)-9H-purine (PBA), increased branching in carnation, chrysanthemum, poinsettia, petunia and fuchsia, which showed varying levels of tolerance. In no instance did PBA reduce plant height. Applications of PBA to carnation and chrysanthemum stimulated branching in both intact and pinched plants. Treatment a few days prior to pinching produced more uniform development of new laterals. Response to the compound was most favourable under optimum growing conditions. Under relatively poor light intensity the laterals exhibited a reluctance for continued elongation and showed marked chlorosis. Application of PBA to flower buds at an early stage of development increased both the diameter and the fresh weight of carnation flowers or chrysanthemum inflorescences when fully open. Response to the compound decreased with age of the bud at the time of treatment. In carnation the effects on size were accompanied by an increase in petal area together with an increase in the number of primary petals produced. Relatively high concentrations also induced the formation of secondary growing centres from which varying numbers of additional petals were produced. Relatively large numbers of these secondary centres within a flower resulted in an increased incidence of calyx splitting. These centres were not observed in chrysanthemum. The formation of secondary growing centres could also be induced by GA3 and IAA. However, while these growth substances increased the diameter and fresh weight of carnation flowers, unlike cytokinins they had no apparent effect on the number of primary petals formed. Finally PBA was also observed to increase the longevity of cut flowers of carnation. This was particularly apparent at relatively low temperatures. 相似文献
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S. D. Filipovich R. N. Rowe 《The Journal of Horticultural Science and Biotechnology》2013,88(2):367-370
Spraying young apple trees with 2 000 ppm of SADH resulted in a rapid decrease in the elongation growth of the apical meristem. Within at least four weeks after the application no difference was observed in the total dry weight of the plants compared to unsprayed controls. However, there was a significant increase in the starch content in the whole plant, bark, wood and roots. 相似文献