Effect of osmotic stress and salinity on germination and mucilage expansion of seeds of Plantago albicans L. (Plantaginaceae): Inter‐population variation
S. Mira, L. Veiga-Barbosa, J. Martínez-Laborde, F. Pérez‐García, M. E. González-Benito
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引用次数: 0
Abstract
Plantago albicans L. (Plantaginaceae) grows in wastelands, slopes, and stony pastures, with dry and sun‐exposed soils. Its seeds produce a mucilaginous coat. The main aim of this study was to evaluate intraspecific variation of osmotic and salinity stress response and mucilage production in P. albicans seeds. The relationships between osmotic and salinity stress, germination characteristics, and mucilage expansion were studied in eight populations of P. albicans. Seeds were germinated in distilled water, 20% (w/v) polyethylene glycol 6000 (PEG), or 100 mM NaCl solutions. In most populations, PEG and NaCl reduced final germination. Also, germination was slowed more significantly under osmotic stress than under salinity, while mucilage expansion was more affected by salinity. Therefore, there was an inverse correlation between mucilage expansion and germination under salinity and osmotic stress. Seed populations with similar climatic parameters showed different germination response; however, a correlation was found between mucilage expansion and some climatic parameters. Seeds from drier habitats germinated faster under water stress and produced more mucilage under control and water stress than populations from more humid areas.
白色车前草(车前草科)生长在荒地、斜坡和多石的牧场上,土壤干燥且暴露在阳光下。它的种子产生一层黏糊糊的外壳。本研究的主要目的是评估白色念珠菌种子的渗透和盐度胁迫反应以及粘液产生的种内变异。研究了8个白色念珠菌种群的渗透胁迫和盐度胁迫、发芽特性和粘液膨胀之间的关系。种子在蒸馏水、20%(w/v)聚乙二醇6000(PEG)或100 mM NaCl溶液。在大多数群体中,PEG和NaCl降低了最终发芽率。此外,在渗透胁迫下比在盐度下发芽更显著,而粘液膨胀更受盐度的影响。因此,在盐度和渗透胁迫下,粘液膨胀与发芽呈负相关。气候参数相似的种子群体表现出不同的发芽反应;然而,发现粘液膨胀与一些气候参数之间存在相关性。与来自更潮湿地区的种群相比,来自更干燥栖息地的种子在水分胁迫下发芽更快,在控制和水分胁迫下产生更多的粘液。
期刊介绍:
Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.