三种贝母核型的比较研究

The present paper deals with a comparative karyotypic study of three species in Fri- tillaria-F. thuncergii Miq., F. anhuiensis S.  . Chen et S. F. Yin and F. hupehensis Hsiao et K. C. Hsia.  The karyotype of F. anhuiensis S. C. Chen et S. F. Yin is first reported.       The karyotypes of the three species of Fritillaria are rather similar, all with K(2n)=24= 2m+2sm+12t+4st+4m (SAT), showing a close interspecific relationship.  They all have two pairs of st chromosomes, one of which is the third chromosome in all the three species studied, but the other is the seventh in F. thunbergii Miq, the eighth in F. anhuiensis S. C. Chen et S. F. Yin, and the fifth in F. hupehensis Hsiao et K. C. Hsia.  It tells us that there are some differences in their karyotypes.  All of the three species possess two pairs of satellite chromosomes with the satellites located on the long arms. A heterochromatic zone is found sometimes on long arms of No. IX chromosome in each species of Fritillaria and on one of No. I chromosomes in both F. thun- bergii Miq. and F. anhuiensis S. C. Chen et S. F. Yin, a chromosome polymorphism occurring between populations of Fritillaria. In addition, three B chromosomes are always found in most root-tip cells of F. hupehensis Hsiao et K. C. Hsiao.     

浅谈对节白蜡树桩盆景的创作技巧——以《枯木逢春》为例

对节白蜡是我国特有珍稀植物,是优良的盆景材料。以获奖作品《枯木逢春》为例,介绍在树桩种类选择、胚桩处理、栽植与养护、繁殖与修剪各个环节应注意哪些问题。在创作盆景作品时,尤其要注意盆景的宾主关系和意境美。     

对节白蜡多年生枝干扦插繁殖技术的研究

对节白蜡是＂湖北省特有珍稀新种保护植物＂和＂国家二级珍稀濒危植物＂,当前市场对盆景的需求量大,对树种掠夺性开发的问题严重。本试验以对节白腊的多年生枝干为材料,从不同的扦插基质、不同扦插时间和小环境以及不同插穗处理等方面进行试验,以期获得最佳的快速繁殖技术,促进树桩的成型,为培养老桩盆景提供技术依据,从而达到保护珍稀濒危植物和满足市场需求双赢的目的。     

湖北海棠种子甲醇浸提液的生物测定

通过对湖北海棠种子甲醇浸提液的生物测定,探讨湖北海棠种子休眠与种子内源抑制物质的关系。结果表明,湖北海棠种子不同浓度的甲醇浸提液对白菜种子发芽率及幼苗的高生长、根生长均有抑制作用,浓度越高抑制作用越明显。方差分析结果表明,不同处理组之间白菜种子发芽率、苗高和根长存在显著差异。其中用0%、25%、50%、75%和100%的浸提液处理白菜籽,其发芽率分别为82.5%、72%、64%、34%和18%,根长分别比对照大约降低了6%、11%、18%和26%,苗高分别比对照大约降低了22%、38%、52%和66%,表明湖北海棠种子含有抑制种子萌发和幼苗生长的成分。