| 海水盐度对两种红树植物胚轴萌发的影响 |
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| 引用本文： | 莫竹承,范航清,何斌源.海水盐度对两种红树植物胚轴萌发的影响[J].植物生态学报,2001,25(2):235-239. |
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| 作者姓名： | 莫竹承 范航清 何斌源 |
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| 作者单位： | 广西红树林研究中心， 北海 536000 |
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| 基金项目： | 国家自然科学基金(49866001)、广西“十百千人才工程”专项和桂科配(9912013)资金 |
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| 摘 要： | 对采自广西海岸的木榄(Bruguiera gymnorrhiza)和红海榄(Rhizophora stylosa)胚轴进行品质检测，相关数据可作为该地区胚轴评价的参考指标。不同盐度海水水培和淡水沙培试验的结果表明：较之海水盐度为20‰和30‰的高盐度海水，10‰以下的低盐度海水对木榄胚轴萌根和发芽有明显促进作用，使始萌根日缩短一半时日(6d)，平均萌根日数快7.1～4.8d，萌根率提高20％～30％，并且较早开始发芽。红海榄胚轴萌根的最佳盐度条件为20‰左右的高盐度，此时的萌根率和平均萌根率分别达到90％和68％，淡水条件下红海榄的萌根率只有40％。试验还发现木榄胚轴连续萌根率具有双峰值现象，红海榄胚轴顶端的发芽可能会受下胚轴曝光的抑制。
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| 关 键 词： | 海水盐度 红树胚轴 萌根 发芽 |
| 修稿时间： | 2000年1月3日 |
EFFECTS OF SEAWATER
SALINITY ON HYPOCOTYL GROWTH IN TWO MANGROVE SPECIES |
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| MO Zhu-Cheng,FAN Hang-Qing,and,HE Bin-Yuan.EFFECTS OF SEAWATER
SALINITY ON HYPOCOTYL GROWTH IN TWO MANGROVE SPECIES[J].Acta Phytoecologica Sinica,2001,25(2):235-239. |
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| Authors: | MO Zhu-Cheng FAN Hang-Qing and HE Bin-Yuan |
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| Abstract: | The quality of Bruguiera gymnorrhiza and Rhizophora sty losahypocotyl budding and rooting in water of different salinities (expressed relative to normal sea water) was studied in seeds from the Guangxi coast. Seaw ater salinity lower than 10‰ promoted the budding and rooting of B. gymnorrhi za hypocotyls. Relative to those grown in water with salinity levels higher th an 20‰ and 30‰ these began rooting about 6 days earlier and mean rooting was 7 .1-4.8 days earlier. Rooting rates were 20%-30%. The best seawater salinity co ndition for R. stylosa hypocotyl rooting was about 20‰ at which the rooting rate and mean rooting rate were 90% and 68% respectively. The rooting rate was only 40% in freshwater. A novel bimodal phenomenon in the continuous rooting rat e of B. gymnorrhiza hypocotyles was also observed. Budding of R. stylosa hypocotyls appears to be limited when their base is exposed to light. |
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| Keywords: | Seawater salinity Mangrove hypocotyl Rooting Budding |
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