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Seed dormancy of Cardiospermum halicacabum (Sapindaceae) from three precipitation zones in Sri Lanka
Plant Biology ( IF 3.9 ) Pub Date : 2020-09-28 , DOI: 10.1111/plb.13189
V. Thusithana 1 , R. W. K. Amarasekara 2 , K. M. G. Gehan Jayasuriya 1, 3 , N. S. Gama‐Arachchige 1, 3 , C. C. Baskin 4, 5 , J. M. Baskin 4
Affiliation  

  • This study investigated seed germination of Cardiospermum halicacabum, a medicinally important invasive species.
  • We compared mass, moisture content (MC), dormancy and dormancy‐breaking treatments and imbibition and germination of scarified and non‐scarified seeds of C. halicacabum from a low‐elevation dry zone (DZ), low‐elevation wet zone (WZ1) and mid‐elevation wet zone (WZ2) in Sri Lanka to test the hypothesis that the percentage of seeds with water‐impermeable seed coats (physical dormancy, PY) decreases with increased precipitation.
  • Seed mass was higher in WZ2 than in DZ and WZ1, while seed MC did not vary among the zones. All scarified DZ, WZ1 and WZ2 and non‐scarified DZ and WZ1 seeds imbibed water, but only a few non‐scarified WZ2 seeds did so. When DZ and WZ1 seeds were desiccated, MC and percentage imbibition decreased, showing that these seeds have the ability to develop PY. GA3 promoted germination of embryos excised from fresh DZ and WZ1 seeds and of scarified WZ2 seeds.
  • At maturity, seeds from DZ and WZ1 had only physiological dormancy (PD), while those from WZ2 had combinational dormancy (PY+PD). Thus, our hypothesis was not supported. Since a high percentage of excised embryos developed into normal seedlings; this is a low‐cost method to produce C. halicacabum plants for medicinal and ornamental purposes.


中文翻译:

斯里兰卡三个降水区的无心菜种子的休眠

  • 这项研究调查了医学上重要的入侵物种Cardiospermum halicacabum的种子发芽。
  • 我们比较了低海拔干燥区(DZ),低海拔湿润区(WZ1)的念珠菌的钝化和非瘢痕化种子的质量,水分含量(MC),休眠和打破休眠的处理以及吸水和萌发的种子斯里兰卡中部高湿区(WZ2),以检验以下假设:不透水种皮的种子百分比(物理休眠,PY)随降水增加而降低。
  • WZ2中的种子质量高于DZ和WZ1中的种子质量,而种子MC在各区域之间没有变化。所有划痕的DZ,WZ1和WZ2种子以及未结疤的DZ和WZ1种子都吸收水,但是只有少数未结疤的WZ2种子吸收了水。干燥DZ和WZ1种子后,MC和吸收率降低,表明这些种子具有发展PY的能力。GA 3促进了从新鲜DZ和WZ1种子和稀疏WZ2种子中切除的胚的萌发。
  • 成熟时,来自DZ和WZ1的种子只有生理休眠(PD),而来自WZ2的种子具有组合休眠(PY + PD)。因此,我们的假设不受支持。由于大量切除的胚胎发育成正常的幼苗;这是生产用于药用和观赏目的的螺旋藻的低成本方法。
更新日期:2020-09-28
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