澳洲本土种长叶花种子形态解剖及萌发促进。和L. hystrix (R.Br.)L.R. Fraser & Vickery

Fernanda Caro Beveridge, Alwyn Williams, R. Cave, Sundaravelpandian Kalaipandian, S. Adkins
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摘要

骆马属植物是澳大利亚原生生态系统中重要的林下植物,具有丰富的植物区系和稳定土壤的作用。然而,目前对其萌发生物学的了解有限,阻碍了它们在种子恢复和观赏植物生产中的有效利用。本研究考察了长叶罗汉子(Lomandra longifolia)和一水莲(L. hystrix一水莲)的形态解剖,并评价了不同的机械和/或化学处理(niking、淋洗、烟熏水和赤霉素[GA3])和光照或黑暗条件下对发芽的促进作用。两种植物的胚均呈小线形,胚种比较低(<0.45)。与未浸出种子相比,两种种子在自来水中浸出36小时后,发芽率都显著加快。结果表明,通过浸出预处理两种罗麻属植物,可以使种子萌发更快、更均匀、更可靠,从而最大限度地提高种子利用率。最后,长叶l种子的最终发芽率较低(<40%),存在较多的活种子和休眠种子。促进这两种植物在自然界发芽的生态因素还有待进一步研究。
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Seed Morpho-Anatomy and Germination Enhancement of the Australian Native Species Lomandra longifolia Labill. and L. hystrix (R.Br.) L.R. Fraser & Vickery
Lomandra species are an important understory component of many Australian native ecosystems, contributing to the floristic richness and stabilizing soils. However, a limited understanding of their germination biology currently hinders their efficient use in seed-based restoration and ornamental plant production. The present study investigated Lomandra longifolia and L. hystrix diaspore morpho-anatomy and evaluated different mechanical and/or chemical treatments (nicking, leaching, smoke water and gibberellic acid [GA3]) and under light or dark conditions to enhance germination. Embryos of both species were small and linear with a low embryo to seed ratio (<0.45). Germination rates of both species were significantly hastened by leaching seeds in running water for 36 h as compared to a non-leached seed. The results suggest that pre-treating both Lomandra species by leaching could maximize the effectiveness of seed used by resulting in faster, more uniform and, therefore, reliable germination of these species. Finally, seeds of L. longifolia had low final germination (<40%), with a high presence of viable but dormant seeds. The ecological cues that promote germination in nature for both species should be further examined.
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