共查询到20条相似文献，搜索用时 125 毫秒
1.
从抑制方面探讨白皮松种子的深休眠性，通过提取种子不同部位的抑制物及生物碱测定来寻找解除白皮松种子的休眠途径，促进种子萌发，提高场圃发芽率。 相似文献
2.
3.
4.
5.
喜马拉雅白皮松种子育苗技术 总被引：1，自引：0，他引：1
喜马拉雅白皮松种子育苗技术王福宗（河北省林业科学研究所石家庄０５００６１）贾志宏（涿鹿县林业局）关键词喜马拉雅白皮松种子育苗育苗方式育苗技术１种子的准备及处理１．１种子性状喜马拉雅白皮松（Ｐｉｎｕｓｇｌｒａｒａｄｉａｎａ）一般１８～２０年开始结实。５... 相似文献
6.
卫星搭载华山松、白皮松种子苗木培育试验研究初报 总被引：5，自引：0，他引：5
以2004年甘肃省林业厅组织搭载我国第20颗返回式卫星的华山松、白皮松种子为试材,开展苗木培育研究。通过试验研究,初步认为,经过太空诱变处理的华山松形态与对照无差异、白皮松种子颜色变浅;太空华山松种子较对照发芽早、播种早,但出苗时间无差异;太空白皮松种子较对照发芽晚、播种也晚,但出苗时间差异不明显。华山松太空种子苗在1年生时,苗高、地径比对照分别大12.27%、29.41%,2年生时,苗高、地径依然比对照大9.86%、28.24%;最突出单株的苗高、地径分别为9.3 cm、0.41 cm,比对照平均值大50.00%、13.89%。白皮松太空种子苗在1年生时,苗高、地径不如对照,但在2年生时,苗高、地径比对照大6.55%、25.00%;最突出单株的苗高、地径分别为10.6 cm、0.54 cm,比对照平均值大46.61%、63.64%。 相似文献
7.
白皮松是我国特产的珍贵树种，树冠苍翠挺拔，树皮斑驳奇特。该树种属深根性喜光树种，抗风、耐干冷，对土壤要求不严；对SO2气体及烟尘具有较强抗性；因其具有很高的观赏、生态和经济价值而成为人们普遍喜爱的树种之一。但由于白皮松的种皮坚硬、透性差以及种胚有休眠特性，通常采用温水浸种与低温层积相结合的方法于春季播种，发芽率60％左右。采取低温层积前先用浓硫酸对白皮松种皮进行烧壳腐蚀的措施，于春季常规播种，能显著提高发芽率，缩短出苗时间，白皮松种子表现出苗整齐、健壮。具体育苗技术如下： 相似文献
8.
白皮松球果一般都是在9～10月成熟，这时候是白皮松苗木种子采集的最佳时间，一般球果出种率10％，种子千粒重150～160g ，种子粒数6000～7000粒／kg。那么比较良好的白皮松种子应该怎样采集呢？首先应选择一个优良的白皮松母树，采收完的白皮松的球果需要在通风良好的地方摊晒，这样也是为了等球果鳞开裂后用棍棒敲打，这样便于种子的采集。收集到种子后要及时去除杂物风干，保持种子的纯净。纯净的种子要放在通风良好、干燥、低温的地方进行储藏。一般采集到的种子尽量用于当年育苗，这样能提高种子的发芽率。一般陈种子育苗发芽率降低30％～60％，对于种子的育苗不是很有利。 相似文献
9.
设置了植物喷施灵5种浓度处理,分别为0．325g／L0.650g／L,300g／L,2．600g／L,清水对照;研究了植物喷施灵对白皮松种子萌发的影响。结果表明：植物喷施灵对白皮松种子的发芽效果有显著影响,植物喷施灵的浓度为0．325g／L时,对白皮松种子萌发的促进作用最大,发芽率为77％;浓度为0．650g／L。对提高白皮松种子的发芽势最有利,发芽势为44％。 相似文献
10.
11.
红松组织培养技术的初步研究 总被引：6，自引：0，他引：6
以ＭＳ为基本培养基,加入不同种类和浓度的激素,对红松离体胚和２￣３ａ生幼苗的顶芽进行组织培养。在含有激素的培养基上,离体胚在量愈伤组织和畸形苗。顶经过４－５个月培养后,在细胞分裂素含量较高的培养基上形成少量侧芽,在生长素类激素含量较高的发生不定根。 相似文献
12.
Evaluation of seed production in a first-generation seed orchard of Chinese pine(Pinus tabuliformis)
《林业研究》2016,(5)
We evaluated seed production in a first-generation orchard of Chinese pine(Pinus tabuliformis) during the crucial transition period from first generation to advanced generations.Clones varied significantly in all traits related to seed production.Repeatability of these traits ranged from 0 to 0.96.Seed production per ramet(SPPR),seed producing index(SPI),the number of relative female strobili(RFS),the number of scales,and the number of ineffective scales had comparatively high repeatability at 0.86,0.87,0.89,0.96,and 0.91,respectively.Correlation analysis showed that SPPR was greatly influenced by RFS and by the number of full seeds per cone.Finally,we showed that SPI was the best predictor of the seed-producing ability of clones.Our findings will assist seed orchard managers in effectively predicting and improving seed production of Chinese pine seed orchards. 相似文献
13.
Loblolly pine seed dormancy: constraints to germination. 总被引：1，自引：0，他引：1
Stratification by moist chilling is often used to break seed dormancy in loblolly pine (Pinus taeda L.). The role that moist chilling plays at the cellular level in preparing the embryo for germination and early seedling growth was investigated. Moist chilling did not affect the embryo's ability to mobilize seed storage proteins, which is a biochemical marker of early seedling growth. Analysis of in vivo protein synthesis profiles indicated that moist chilling has only a subtle effect on gene expression in the embryo or germinant. The means by which moist chilling affects interactions between the seed coat and the living tissues of the seed also was studied. Although the seed coat is mainly a mechanical barrier to germination, seed coat replacement studies showed that moist chilling alleviates some factor(s) in the seed coat that significantly inhibit germination. 相似文献
14.
对上庄油松种子园母树林的土壤培育现状进行了研究,结果表明：油松良种试验林的树干通直度和林木生长速度明显优于普通人工林;阴坡、半阴坡林地的土壤物理性质和养分情况明显优于阳坡、半阳坡。最后提出了早春浅耕、伏季旋耕,加强肥培管理,根据气候条件灵活灌溉等母树林土壤管理的措施。 相似文献
15.
The effects of microhabitat (shrubs and herbs), plant litter, and seed burial on the regeneration of Liaodong oak (Quercus wutaishanica Mayr) and Chinese pine (Pinus tabulaeformis Carr.) were studied in three typical stands (Liaodong oak forest, Chinese pine plantation, and grassland) in the Loess Plateau, China. We monitored the establishment and growth of seedlings of these two woody species in sown experimental plots, in which shrubs and herbs, plant litter, and seed burial were manipulated. In the grassland, shrubs and herbs facilitated Liaodong oak establishment, with no effect on the establishment of Chinese pine. In the two forest stands, shrubs and herbs primarily had an inhibition effect on the establishment of these trees. The effects of plant litter were facilitation or inhibition, depending on the target species and the habitat. Seed burial had a positive effect on seedling establishment. In all three habitats, shrubs and herbs had inhibition effects on seedling growth of both tree species. Plant litter and seed burial did not influence seedling growth in either species. Liaodong oak and Chinese pine use different regeneration strategies during early stages of succession and similar strategies during late stages of succession. 相似文献
16.
We evaluated seed production in a first-generation orchard of Chinese pine (Pinus tabuliformis) during the crucial transition period from first generation to advanced generations. Clones varied significantly in all traits related to seed production. Repeatability of these traits ranged from 0 to 0.96. Seed production per ramet (SPPR), seed producing index (SPI), the number of relative female strobili (RFS), the number of scales, and the number of ineffective scales had comparatively high repeatability at 0.86, 0.87, 0.89, 0.96, and 0.91, respectively. Correlation analysis showed that SPPR was greatly influenced by RFS and by the number of full seeds per cone. Finally, we showed that SPI was the best predictor of the seed-producing ability of clones. Our findings will assist seed orchard managers in effectively predicting and improving seed production of Chinese pine seed orchards. 相似文献
17.
Fluorescein diacetate (FDA) was tested as a viability stain for roots of green ash as well as for seeds of green ash and 10 other tree species. The viability level indicated by FDA staining of green ash roots agreed well with root growth potential results, bud condition assessment, and foliage browning measurements. In seed viability experiments, the FDA staining intensity of embryos was related to germination in 9 out of 11 species tested using a 30 minute stain incubation period. In the other 2 species, eastern hemlock and Scotch pine, embryo FDA staining intensity and germination were also similar, provided an 18 h stain incubation period was used. When two seedlots of differing viability were tested in each of white spruce, Douglas-fir, and pitch pine, significantly higher germination was reflected in significantly higher embryo FDA staining intensity. In Sitka spruce seed that was heat treated to produce a range of viabilities, the semilog plot of germination (log scale) and FDA staining intensity of the embryo (linear scale) had an r2= 0.95. Based on these preliminary results, FDA shows promise as a rapid viability stain for tree roots and seeds. 相似文献
18.
Stage-specific analyses of starch and 18 sugars, including pentoses, hexoses, disaccharides, trisaccharides, oligosaccharides and sugar alcohols, were made throughout seed development for zygotic embryo and female gametophyte (FG) tissues of loblolly pine (Pinus taeda L.). Tissue was most often analyzed in triplicate from two open-pollinated families grown in different locations and sampled in different years. Carbohydrates were analyzed by enzymatic assay, high performance liquid chromatography or gas chromatography/mass spectrometry. For all carbohydrates quantified, peak concentrations were higher in embryo tissue than in FG tissue. Significant changes in starch and sugar concentrations occurred over time, with both seed collections showing similar trends in temporal changes. Although concentrations were not always similar, embryo and FG tissues generally showed similar patterns of change in starch and sugar concentrations over time. Total starch concentration was highest during early seed development and decreased as development progressed. The major sugars contributing to osmotic potential during early seed development were D-pinitol, sucrose, fructose and glucose. During mid-seed development, D-pinitol, sucrose, fructose, glucose, melibiose and raffinose provided major contributions to the osmotic environment. During late seed development, sucrose, raffinose, melibiose, stachyose and fructose were the major contributors to osmotic potential. These data suggest stage-specific media composition for each step in the somatic embryogenesis protocol. 相似文献
19.
陕西省油松良种基地生产能力分析 总被引：3，自引：1，他引：3
对陕西省己建成的油松良种基地现实良种生产数量和质量分析结果表明,良种的遗传品质和播种品质基本上达到了营建初级种子园的目的,但基地生产能力较低,良种数量远远满足不了造林用种的需要。并对加强良种基地管理,提高良种生产能力提出了一些看法。 相似文献
