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马尾松是我国南方各省市主要用材造林树种,需种量大。为了提高现有马尾松无性系种子园质量与产量,我们观测了园内无性系开花结实习性和产量,开展种子园自由授粉子代测定。据此,实现种子园无性系产籽量与子代家系生长量联合再选择,进行去劣疏伐,取得了显著效果。 相似文献
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长白松引种调查报告 总被引:2,自引:0,他引:2
河北省山地树种单纯 ,作为用材和公益林的针叶树尤显贫乏 ,致使人工林组成不合理、林地生产力不高 ,社会生态效益难以充分发挥。要扭转这一局面 ,根本办法是进行乔灌木的树种改良 ,引种驯化则是重要途径之一。为此 ,我们从 2 0世纪 80年代开始 ,相继引进一批针叶树和治沙灌木 ,其中 ,长白松引种已达 1 7年 ,完成了种子繁殖、扦插育苗、荒山造林及开花结实的生长发育周期。1 产地与引种地的自然条件长白松 (美人松、长白赤松 )学名 P.sylvestriformis,产于吉林省长白山北坡海拔80 0~ 1 6 0 0 m山地 ,乔木 ,树高达 30 m,树干通直 ,光滑 ,树… 相似文献
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松树开花的生物学特性介绍 总被引:1,自引:0,他引:1
我省松树种类较多,除已普遍作为山地造林的马尾松、黑松外,又陆续从国外引进了火炬松、湿地松、晚松、短叶松、等松树,特别是火炬松和湿地松具有生长快、适应性强、病虫害少等优良特性,已逐步成为我省淮河以南丘陵山区的主要用材树种之一.因此,研究掌握火炬松、湿地松等松树开花的生物学特性,以便人工促进开花结实,开展人工杂交育种,不断提高种子产量,以及选育良种具有十分重要的意义.近几年未,我省正在进行火炬松、湿地松的人工辅助授粉试验.为了进一步搞好这一项工作,特将有关松树开花的生物学特性作些介绍,供有关单位参考. 相似文献
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介绍一个新树种──刚火松 总被引:1,自引:0,他引:1
介绍一个新树种──刚火松李立潮,杨传书刚火松是南京林业大学育种教研室培育出的刚松和火炬松杂交种,具有明显的杂交优势,引种以来表现出生长快、抗性强等特点,是很有发展前途的速生绿化树种和用材树种。一、引种地区的自然概况引种试验地地处东经111°10’,北... 相似文献
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五针松属松科松属,树姿优美,苍劲挺拔,枝密叶短,翠绿葱茏,寿命长,适于造型。既是吊扎盆景的珍贵材料,又是庭园绿化、室内供赏的优良树种。我国栽培的五针松虽能开花结实,但种子多空瘪,即使偶有受孕 相似文献
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英德火炬松改良种子园无性系开花的时空变化 总被引:1,自引:1,他引:1
对英德火炬松改良种子园建园无性系的开花习性进行了观察,发现大部分无性系雌、雄花发育良好。无性系开花时间大约在3月4~26日,大多数无性系雌花在3月7—8日开始开放,少数在3月4~6日开始开放,雄花大多数在3月9~10日开始开放。总体上雌花比雄花早2~3d开放,早1~2d结束。全园雌花盛花期为3月8~17日,雄花盛花期为3月12~19日,雌、雄花盛花期有一个星期的时间相遇,自然条件下可保证充分授粉。种子园嫁接后第2年到第3年,90%以上的无性系开花,平均开花株率略高于70%;从第3年到第4年,100%的无性系开花,开花株率接近95%。说明嫁接后第3~4年,是种子园进入盛产的关键时期,也是实施人工控制授粉的有利时期。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):341-346
Endogenous gibberellin A1 (GA1), GA3, GA4 and GA9 were quantitated in elongating shoots of Norway spruce [Picea abies (L.) Karst.] grafts with a good or a poor flowering history. The grafts were grown either in a natural environment outdoors, cool and wet (CW) treatment, or in a greenhouse with elevated temperatures and controlled drought stress, hot and dry (HD) treatment. The GAs were quantitated by gas chromatography‐mass spectrometry selected ion monitoring (GC‐MS SIM) using deuterated GA1, GA3, GA4 and GA9 as internal standards. Terminal shoots from the second whorl of branches were harvested at 76%, 86% and 96% shoot elongation for the CW treated grafts and at 90% and 99% shoot elongation for the HD treated grafts. The content of GAs in the CW grafts was highest during most rapid shoot elongation, GA9 being the dominant GA. The levels decreased as shoot elongation ceased. This was also noted for GA‐content in shoots of the HD treated grafts. A comparison of the GA‐amounts at ca. 96% of total shoot elongation for the CW treated grafts and ca. 99% of total shoot elongation for the HD treated grafts revealed that shoots of the good flowering clone had a higher content of GA9 and a lower content of GA, and GA3. When comparing the HD treated and CW treated grafts, the shoots of HD treated grafts contained higher concentrations of GA9 but lower concentrations of GA, and GA3. Calculating the ratios between [GA9] and [GA1] resulted in a ratio of 12.5 and 36.6 for the good flowering clone grown outdoors and in greenhouse, respectively. The same ratios were for the poor flowering clone 1.45 and 3.8 when grown outdoors and in greenhouse, respectively. A higher ratio may indicate a higher capacity of synthezise the importance of flowering GA4 from GA9 and a lower conversion of GA4 to GA1, thereby favouring the diffentiation to reproductive buds. 相似文献
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核桃幼树内源激素与生长势的关系 总被引:5,自引:0,他引:5
激素在果树生长发育过程中起着重要调控作用,基因通过激素控制植株高矮(曾骧,1992).对苹果(Maluspumila)、李(Prunus salicina)、桃(Prunus persica)等果树内源激素与生长势的关系已有一些报道(王丽琴等,2002;周怀军等,2002;孙艳香等,2001),但在核桃上有关研究尚少.本试验以核桃(Juglans regia)不同品种的嫁接植株及实生苗为试材,探讨内源激素与树体生长势的关系,为选择核桃矮化砧木提供理论依据. 相似文献
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对日本落叶松种子园优良家系雌雄球花数量及在树冠上的分布规律进行调查分析。结果表明:日本落叶松雄球花在树冠垂直方向上分布差异极显著,下层和中层的数量显著多于上层,所占比例为83.39%,水平方向上南面的雄球花多于其他方向;雌球花在树冠不同冠层的分布无显著差异,中、上层的雌球花数量比下层多,东、南方向多于西、北方向;雄球花多着生在2,3 a生枝上,雌球花多着生在3,4 a生枝上,1 a生枝条上无花;不同无性系间雌雄球花数量差异显著,356号无性系的雌雄球花数量均为最多。 相似文献
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On average, branches of Pinus contorta Dougl. bearing male cones had 35 fewer needle pairs than equivalent vegetative branches, and significantly fewer differentiated primordia (i.e., male cones + needle pairs + sterile cataphylls). It was estimated that the formation of male cones results in a 27-50% reduction in the number of needles per male cone-bearing branch. In early spring, branches bearing male cones had on average 23% (0.44 g) more dry weight than vegetative branches. On average, 95% of the dry weight of male cone-bearing branches was allocated to the terminal shoot (54% of which was male cones) and 5% to the lateral shoots. By comparison, vegetative branches allocated 85% of their total dry weight to the terminal shoot and 15% to the lateral shoots. These findings suggest that male cones may reduce the photosynthetic potential of the trees which bear them. 相似文献
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银杏性别分化阶段的早期鉴定及其激素调控 总被引:7,自引:0,他引:7
通过对银杏植株不同生长发育阶段同工酶检测,确定银杏植株在90d苗龄期已经开始性别分化,在此基础上,对90d生之前的银杏植株进行激素处理,发现激素处理可以改变银杏的性比,其中,赤霉素具有诱雄作用,乙烯利具有诱雌作用。 相似文献
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落叶松幼苗顶芽萌发过程中内源激素含量的变化 总被引:2,自引:0,他引:2
对落叶松幼苗项芽萌发过程中内源激素含量变化的研究结果表明:吲哚乙酸(IAA)、赤霉酸(GA3)、脱落酸(ABA)、玉米素核苷(ZR)在项芽或新梢中含量较高,而新梢形成期幼苗根中IAA、GA3及ZR含量均显著高于其它时期的幼苗,而其ABA含量则与其它时期幼苗无显著差别;项芽将萌发期幼苗叶片中的IAA、GA1及ZR含量高于其它幼苗。 相似文献