Seed germination ecology of the medicinal plant motherwort (Leonurus cardiaca)

IF 2.1 3区 生物学 Q2 PLANT SCIENCES
David J. Susko
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引用次数: 0

Abstract

Leonurus cardiaca is a perennial mint species with a long history of use as a medicinal herb. It produces a wide variety of phytochemicals with pharmacological properties that are used to treat anxiety and sleep disorders, cardiac disorders, and to reduce inflammation. Surprisingly, scant information is available concerning its seed germination ecology. Hence, this study investigated the presence/kind of seed dormancy and the effects of several environmental factors on seed germination and seedling emergence. Seeds were collected from three populations, and they were subjected to germination and seedling emergence experiments in which environmental factors, including temperature, light, cold stratification, pH, osmotic stress, and depth of burial, were manipulated. Non-stratified seeds germinated over a range of alternating temperature regimes from 20/10 to 30/20°C, but they did not germinate at 15/5°C. Optimum germination occurred between 25/15 and 30/20°C. The presence or absence of light did not affect germination. Cold stratification at 4°C enhanced germination at the two coolest temperature regimes. Seed germination occurred over a solution pH range of 5–10 and exceeded 55% in buffer solutions with pH 6–10. Low levels of osmotic stress reduced germination; only 3–8% of seeds germinated at −0.2 MPa. Maximum seedling emergence occurred when seeds were placed on the soil surface, and emergence decreased with increased burial depths to 5 cm. Overall, seeds exhibited germination characteristics associated with type 2 non-deep physiological dormancy at maturity. Seeds primarily germinated at incubation temperatures of ≥ 25/15°C; however, conditionally dormant seeds became nondormant after prolonged exposure to cold stratification.

益母草种子萌发生态学的研究
益母草是一种多年生薄荷,具有悠久的药用历史。它产生多种具有药理特性的植物化学物质,用于治疗焦虑和睡眠障碍、心脏疾病和减少炎症。令人惊讶的是,关于其种子萌发生态学的信息很少。因此,本研究探讨了种子休眠的存在/类型以及几种环境因素对种子萌发和出苗的影响。收集3个种群的种子,在温度、光照、冷分层、pH、渗透胁迫和埋深等环境因素的影响下进行萌发和出苗实验。非分层种子在20/10至30/20°C的交替温度范围内发芽,但在15/5°C时不发芽。在25/15°和30/20°C之间萌发最佳。有光或没有光都不影响发芽。4°C的冷分层促进了两种最冷温度下的萌发。在pH值为5-10的溶液范围内,种子萌发率超过55%,在pH值为6-10的缓冲溶液中。低水平的渗透胁迫降低了种子萌发;−0.2 MPa下只有3-8%的种子萌发。种子埋于土壤表层时出苗率最高,埋深至5 cm时出苗率随埋深的增加而降低。总的来说,种子在成熟时表现出与2型非深度生理休眠相关的萌发特征。种子主要在≥25/15℃的孵育温度下发芽;然而,条件休眠种子在长时间暴露于冷分层后变得不休眠。
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来源期刊
Seed Science Research
Seed Science Research 生物-植物科学
CiteScore
3.60
自引率
4.80%
发文量
23
审稿时长
>12 weeks
期刊介绍: Seed Science Research, the official journal of the International Society for Seed Science, is a leading international journal featuring high-quality original papers and review articles on the fundamental aspects of seed science, reviewed by internationally distinguished editors. The emphasis is on the physiology, biochemistry, molecular biology and ecology of seeds.
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