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杜仲嫩枝扦插育苗中插穗不定根的发生属于诱生根原基型。不定根从形成层外层细胞、韧皮部薄壁细胞开始发生,属于皮层生根型。插穗基部产生的愈伤组织主要起保护、吸收等作用,与不定根的产生无直接关系。 相似文献
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以南京椴嫩枝插穗为研究对象,采用1 000 mg·kg-1 IBA粉剂处理插穗基部,对扦插生根过程中插穗皮部生长素IAA、玉米素核苷ZR、赤霉素GA3、脱落酸ABA含量以及IAA/ABA和IAA/ZR比值进行动态测定,探究嫩枝扦插生根过程中植物激素变化特点及其对生根的影响。结果表明:1)IBA处理可以显著促进南京椴嫩枝插穗生根,生根率接近67%;其生根过程可划分为愈伤组织形成期、根原基诱导期、不定根形成期和不定根生长期,各自对应时间约为10 d。2)IBA处理可以提高嫩枝插穗中IAA含量,IAA对于根原基的诱导和不定根的发生具有较为直接的影响作用,其含量升高有利于生根;GA3含量增加有利于根原基形成,而低水平GA3则更有利于不定根的生长;ABA和ZR含量升高不利于插穗生根,对于根原基的诱导和不定根的发生具有抑制作用;IAA、ABA在插穗根原基诱导和不定根形成过程中具有相互协调作用,IAA/ABA可作为衡量南京椴嫩枝扦插生根能力的指标。3)外源IBA处理可以促进插穗内IAA含量升高,调节ABA、ZR、GA3含量降低,促使IAA/ABA在诱导生根期快速增大,通过相关激素的调控,使插穗向有利于促进生根的生理状态转变。 相似文献
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杨树超短轮伐期经营的生产力及材性的研究 总被引:16,自引:0,他引:16
以美洲黑杨2个无性系为供试材料,研究杨树超短轮伐期经营中地上部分生物量生产、分配模式、N、P、K的输出量及材性。结果表明,在3种密度和3种轮伐期的组合中,2个无性系均以造林密度为10000株·ha-1、轮伐期为3年的林分生物生产力最高,I-69杨为10.52t·ha-1·a-1,NL-80351杨约为12.00t·ha-1·a-1;在生物量的分配比率和作为造纸材的经济生物量上也以这种组合模式最为合理,经济生物量最大,I-69杨为7.14t·ha-1·a-1,NL-80351杨为8·47t·ha-1·a-1。养分输出量的多少与林分的生物量生产和分配比率密切相关。轮伐期为3年,密度为10000株·ha-1的林分N、P、K的输出量最高,I-69杨为33.97kg·ha-1·a-1,NL-80351杨为38.50kg·ha-1·a-1,但NL-80351杨每生产1吨经济生物量所输出的N、P、K总量略低于I-69杨。杨树超短轮伐期经营中生产出的木材都可用作中、低档的造纸原料,其中I-69杨的制浆性能优于NL-80351杨。 相似文献
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微型月季扦插生根能力初步研究 总被引:1,自引:0,他引:1
研究了27个微型月季品种及3个优良杂种的插穗生根能力。结果表明:微型月季品种之间插穗生根能力存在差异,姬、粉姬、小丁香、白柯斯特等品种的插穗生根能力较强,杂种与亲本之间的插穗生根能力也存在差异,激素IBA对微型月季插穗不定根分化的影响大于对不定根生长的影响,插穗的最长根长与不定根数量及平均根长之间存在极显著的相关性。 相似文献
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为了解无患子硬枝扦插生根机制,以1年生无患子硬枝作为扦插材料,在扦插第0—80天调查愈伤组织发育和根系形成情况,测定插穗的腋芽(嫩叶)以及基部2cm长度的韧皮部内源激素和多酚类物质的含量。结果表明,无患子硬枝扦插第10天开始出现愈伤组织,第50天愈伤率达到最高值83.33%;第40天开始出现生根插穗,生根率为6.67%,随后不定根数量迅速增加,第70天生根率达到86.67%,此时平均有5.33条。之后生根数量不变,根系仍然在生长,且扦插后根系效果指数持续增高。插穗韧皮部内源激素含量变化较复杂。整体来看,高含量赤霉素(GA3)抑制愈伤组织和不定根形成,且在根原基发生期和不定根形成关键期达到峰值,在不定根速生期持续下降;高含量生长素(IAA)促进不定根的形成,且在扦插后第20天,即根原基发生期,达到峰值(92.7μg/g);玉米素核苷(ZR)对无患子硬枝扦插过程的生理作用较复杂,低含量的ZR有利于根原基的发生和不定根速生,但高含量的ZR促进不定根形成。韧皮部ZR/IAA在扦插后第20—40天呈下降趋势,第40—60天快速上升,促进不定根生长;GA3/IAA整体呈现抛物线形下降趋势,特别是在根原基发生期和不定根速生期,下降速率更快,以促进不定根的生长。无患子硬枝插穗生根进程中,多数多酚类物质对愈伤组织形成、根原基发生及不定根形成有极显著抑制作用,没食子酸抑制效果稍弱;插穗内多种激素和多酚类物质的含量均发生了变化,且对插穗生根产生重大影响。总之,插穗根原基发生和不定根形成等关键时期,IAA含量升高,GA3、ZR以及多酚类物质含量降低,植物体内多种内源物质此消彼长,达到动态平衡,共同促进插穗生根。 相似文献
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淹水胁迫对杨树无性系苗期生长及生理的影响 总被引:8,自引:0,他引:8
本实验是利用花坛扦插的方法,对3个无性系:NL-80105杨,1-69杨,NL-80351杨的苗期进行人工淹水处理,处理包括:A-对照,B-渍, C-涝。在对3种无性系进行各淹水处理的条件,通过定期的观测和采样,测定3个性无系在不同处理条件下,其生长,生理指标的变化情况。 相似文献
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本实验是利用花坛扦插的方法,对3个无性系:NL-80105杨,I-69杨,NL-80351杨的苗期进行人工淹水处理,处理包括:A—对照,B—渍,C—涝。在对3种无性系进行各淹水处理的条件下,通过定期的观测和采样,测定3个无性系在不同处理条件下,其生长、生理指标的变化情况。 相似文献
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A comparison of pre-planting treatments on hardwood cuttings of four hybrid poplar clones 总被引:1,自引:1,他引:1
Rooting and early growth of four hybrid poplar clones (Populus spp.) planted in a greenhouse were examined after applying 40 pre-rooting treatment combinations to dormant cuttings. Treatments included 2 cutting lengths (5 and 10 cm), 5 soaking times (0, 2, 4, 8, and 12 days), and 4 dips (chitosan, rooting hormone powder, liquid rooting hormone added to the soaking water, and none). Significant differences in both rooting percentages and growth were shown between clones after 7 weeks of growth. Ten cm cuttings had 29% greater rooting success, 28% more above-ground growth, and 12% lower root/shoot ratios than 5 cm cuttings. Cuttings planted without soaking had the lowest rooting success, at less than 45% on average. Commercial rooting hormones decreased the number of rooted cuttings but increased root/shoot ratios. For optimal rooting, we recommend using 10 cm cuttings, soaked for 2 days in water (4 days for the Jackii10 clone) without any additional dipping/hormone substance. 相似文献
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By propagating lodgepole pine (Pinus contorta) cuttings in vivo, we obtained after 7 growing cycles (ca 3.5 years) in a greenhouse, sufficient number of cuttings from most families to establish clonal progeny tests. Twenty-one full-sib families with approximately 20 clones per family were studied for five years. Years when cuttings were set, families within latitude and clones within families differed significantly in rooting percentages, with the variance components 4.2%, 8.2% and 9.5%, respectively. One way to get a frequent and uniform rooting is to take cuttings from non-leading shoots since they have higher rooting percentage than leading shoots. Neither total length of the cuttings nor length of the primary needles were significantly correlated to rooting percentage. With appropriate management of the ortets and the cuttings during rooting, most clones could be included in a cutting propagation program. 相似文献
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以川黔紫薇嫩枝为试验材料,采用15个川黔紫薇无性系扦插繁殖试验筛选出的扦插生根率高的无性系5个,即湘紫L01、湘紫L02、湘紫L06、湘紫L07、湘紫L11进行川黔紫薇嫩枝扦插繁殖效应研究。结果表明:参试无性系穗条扦插生根率变幅为42.2%~89.8%;带2~4个半片叶的穗条可显著提高穗条的生根率;多菌灵不同浓度处理对穗条生根率有显著影响;GGR生根剂不同浓度处理对穗条生根率没有显著影响;不同扦插基质对穗条扦插生根率有显著影响,考虑成本因素,纯黄心土是最经济有效的扦插基质。 相似文献
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为给竹柏优良品系的扩繁提供技术支持,对不同措施处理下竹柏插穗的生根情况进行了试验。结果表明,不同季节扦插对竹柏插穗生根性状具有显著影响,春季是进行竹柏扦插的最佳季节,在春季进行扦插,竹柏的扦插生根率可达91.33%,平均生根条数为3.85条,平均最大根长为6.52cm;竹柏插穗选取的部位对竹柏生根性状有着极显著的影响,来自母树基部的插穗生根效果最好、中部次之,上部最差;不同留叶方式可极显著地影响竹柏扦插的生根率、生根数及最大根长,进行竹柏扦插,插穗应以保留2片全叶为最佳。 相似文献
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Effects of genotype, collection date, auxin treatment, crown position and artificial chilling on rooting and subsequent vegetative growth of Cupressus sempervirens L. softwood cuttings taken from 13-year-old plants were evaluated. Three different clones (318, 296 and 22) previously selected for resistance to cypress cortical cancer caused by Seiridium cardinale were used. In all these clones, both the IBA treated and the untreated cuttings showed seasonal periodicity of rooting. Untreated cuttings rooted best when collected in April (up to 49% for the best clone, i.e. 296) and rooted very poorly in July and October. Auxin treatments appeared unable to overcome this periodicity, as the cuttings taken in July and October did not respond to IBA stimulation. However, in January and April, IBA treatments enhanced adventitious root formation of poorly rooting clones (318 and 22), as well as of clone 296, which performed best (89%) when cuttings were treated in April with 1.5% IBA. Cuttings of each clone collected in the lower third of the crown of the donor trees showed a significantly higher rooting percentage, when compared with those from the upper third. A 4-week post-severance chilling treatment (4°C) significantly enhanced the rooting capacity of cuttings taken in January, while a longer chilling treatment (8 weeks) had a negative effect. The subsequent growth of the rooted cuttings was not affected by either the crown position of the severed cuttings, or the genotype. 相似文献
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Azamal Husen 《New Forests》2008,36(1):13-27
A study was conducted on the twelve clones of shisham (Dalbergia sissoo Roxb.). These clones were obtained from India and Nepal. Single-node leafy cuttings were prepared from the vegetative multiplication
garden to examine the clonal variation, effect of IBA treatment on rooting response and associated metabolic changes during
adventitious root formation. A remarkable and significant variation was observed due to treatment of 2,000 ppm IBA in the
rooting parameters. Clonal variations were also significant for root and shoot growth while length of root was insignificant.
Among the twelve clones studied; C3 (Tulsipur, Gonda, Uttar Pradesh, India) and C4 (Laxmipur, Gonda, Uttar Pradesh, India)
clone cuttings have given the highest rooting response. Interaction (clone × IBA) was significant only for production of number
of roots per cutting. Periodic sampling for clone C3 was performed at 0, 7, 14, 21, 28 and 35 days to examine the contents
of total soluble sugars, starch, protein and peroxidase (PER) activity in the rooting zone of cuttings (∼0.5 cm) during adventitious
root primordium development. A significant increase in all the metabolic activities was noted due to IBA. Total soluble sugars
and starch contents of cuttings decreased with the passage of time. Protein content and PER-activity started to increase in
the early stage and reached the highest level on day 21, followed by a decline at the 35th day of sampling. These trends were
common for both IBA treated and untreated cuttings. Protein content and PER-activity remained higher in the rooting zone of
IBA treated cuttings. Overall these findings suggested that exogenous application of IBA may have activated carbohydrate metabolism
for release of energy, while protein and PER-activity were necessary for cell division and differentiation during adventitious
root primordium initiation and development in the rooting zone of cuttings. 相似文献
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罗田垂枝杉不同材料扦插试验研究 总被引:1,自引:1,他引:0
为探索罗田垂枝杉的无性繁殖,以大树侧枝和基部萌条及采穗圃穗条为试验材料进行扦插,分析不同材料、不同系号及不同激素处理生根差异。结果表明:20 a以上的大树Ⅱ级侧枝的扦插生根率较低,为48.11%,而Ⅰ级侧枝的扦插生根率可达65%以上;萌条扦插生根率(88.86%)要远高于优树侧枝扦插生根率(48.01%),两者差异达到极显著水平(p0.01),黄化未木质化穗条扦插生根率仅为6.67%,远低于其他萌条86.94%~91.67%的生根水平,不同系号间萌条生根率从51.57%~98.77%不等;激素处理的采穗圃穗条生根率都在91.57%以上,粉剂1处理后生根数量最多,与其余三种处理差异达到显著水平。可见侧枝扦插要显著差于萌条扦插,而激素处理可以有效提高扦插生根率。 相似文献