排序方式: 共有29条查询结果,搜索用时 15 毫秒
11.
12.
春兰与大花蕙兰杂交后代根状茎增殖与分化条件 总被引:1,自引:0,他引:1
为了筛选适合根状茎增殖分化的条件,以春兰Cymbidium goeringii与大花蕙兰Cymbidium hybridum杂交后代的根状茎为材料进行培养,比较了不同基本培养基、植物生长调节物质和有机添加物等对根状茎增殖与分化的影响。结果表明:1/2MS(Murashige and Skoog)培养基对杂交根状茎增殖与分化效果最适宜;2,4-二氯苯氧乙酸(2,4-D)和激动素(KT)对杂交组合春兰与大花蕙兰‘梦境’‘Wanderland’的根状茎分化作用不显著,1/2MS培养基添加1.0mg·L-16-苄基腺嘌呤(6-BA)+1.0 mg·L-1萘乙酸(NAA)对春兰与大花蕙兰‘梦境’的杂交后代增殖分化效果最佳;使用有机添加物对根状茎增殖有显著影响,其中以椰汁增殖效果最好,其次为香蕉泥、土豆汁;添加100 g·L-1香蕉泥+50 mL·L-1椰汁最利于根状茎的增殖与分化。图1表4参16 相似文献
13.
14.
15.
为了揭示毛果苔草无性系种群营养繁殖中的某些策略,为湿地植物的保护和保育工作提供科学依据,笔者利用分蘖节营养繁殖世代数,对毛果苔草根茎龄级进行判断和划分,统计毛果苔草根茎长度和生物量的年龄结构,并分析各龄级根茎数量特征的变化规律。结果表明,毛果苔草无性系种群根茎的最大存活年龄为9龄;根茎的长度、生物量皆以2~6龄级为主,结构较稳定;生长季内,1、9龄级变化较大:1龄级根茎在果期开始出现,并迅速增加;9龄级根茎在生长季末迅速消失;单位长度根茎的干物质贮量以2~5龄级为主,在4龄级有最高值;生长季后期是毛果苔草根茎营养物质积累的重要时期。1龄根茎的快速生长有利于种群快速、充分地占据或扩展生长空间。 相似文献
16.
17.
L O BRANDSÆTER H FOGELFORS H FYKSE E GRAGLIA R K JENSEN B MELANDER J SALONEN P VANHALA 《Weed Research》2010,50(2):102-109
Brandsæter LO, Fogelfors H, Fykse H, Graglia E, Jensen RK, Melander B, Salonen J & Vanhala P (2010). Seasonal restrictions of bud growth on roots of Cirsium arvense and Sonchus arvensis and rhizomes of Elymus repens. Weed Research 50 , 102–109.
Summary
The success of weed management aimed at depleting the regenerative structures of perennial weeds depends largely on the sprouting activity of rhizome and root buds. Seasonal variation in sprouting of these buds on Cirsium arvense, Sonchus arvensis and Elymus repens was studied for plants collected from Denmark, Finland, Norway and Sweden. At 2‐week intervals from July to October, 5‐cm fragments of roots or rhizomes were cut from plants grown in buckets and planted into soil in pots, half of which were placed immediately into growth chambers at 18°C for 4 weeks. The other half of the pots were initially placed in a dark room at 2°C for 4 weeks before being transferred to the same growth chamber, also for 4 weeks. During the growth chamber period, the numbers of emerged shoots in each pot were counted weekly. The sprouting activity of C. arvense and E. repens was relatively uniform during this period and bud dormancy was not apparent. In all ecotypes of S. arvensis, innate bud dormancy developed during the latter part of the growing season. For all three species, differences in sprouting readiness were found among ecotypes. The results imply that C. arvense and E. repens are more likely to be controlled by mechanical measures in autumn than S. arvensis. 相似文献18.
雷竹竹鞭侧芽分化过程中内源激素的变化 总被引:7,自引:2,他引:7
在竹鞭侧芽分化过程中,脱落酸仅在秋末冬初已分化的侧芽即将进入冬季休眠前出现痕迹。赤霉酸和玉米素含量均为分化前期高,分化后期低。侧芽无论在早春、夏季还是在秋末冬初分化皆遵循这一规律。不同鞭龄的侧芽分化时,随鞭龄的增大赤霉酸呈上升趋势,玉米素则呈下降趋势。夏季分化的侧芽,上述两种激素含量均高于秋末冬初和早春分化的侧芽。吲哚乙酸含量随分化程度的加深而增加,随鞭龄和分化季节而变化,与赤霉酸含量变化相一致。 相似文献
19.
对5种姜黄属(Curcuma L.)植物根茎的形态及其贮藏期根茎的相关特性与人工栽培条件下的开花特性进行了研究.结果表明,可直接用肉眼分辨南岭莪术(Curcuma kwangsiensis var.naulingensis)、广西莪术(C.kwangsiensis),而南昆山莪术(C.nankunshanensis)、郁金(C.aromatica)、大莪术(C.elata)则需切开根茎通过颜色分辨;在整个栽培过程中,水培条件下姜黄属植物的开花率优于土培;南岭莪术开花率最高,且其根茎内蛋白质浓度最高;南昆山 相似文献
20.
禾本科草本植物根状茎发育调控机理研究进展 总被引:1,自引:0,他引:1
根状茎是匍匐的地下茎,为多年生草本和其他单子叶植物通过无性繁殖进行克隆生长的营养器官。根状茎的持续分化和横向延伸生长,赋予了根状茎类禾草很强的水平拓展迁移能力和抗扰动能力,无论在天然草原群落构成还是在改善退化草原、荒漠、沙丘等脆弱生态系统中均发挥了重要作用。根状茎的分化和生长发育是一个复杂的过程,受内在因素和外在刺激的协同调控。通过梳理近年来禾本科草本植物根状茎分化和发育的研究文献,从生境异质性、植物激素及关联基因等方面初步综述了根状茎生长发育调控和响应因素,为深入开展根状茎发育研究以及揭示根状茎型禾草空间分株放置的思维和生态适应的逻辑提供了理论借鉴。 相似文献