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      Seed mass, germination and seedling traits for some central Argentinian cacti

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          Abstract

          Seed size is one of the most important traits in the regenerative phase of a plant's life cycle; however, for cactus species the relationship of seed size and germination characteristics and seedling traits is still unclear. We studied the relationship between seed mass and germination and seedling characteristics in 17 cactus species from central Argentina, belonging to different genera and life forms. We measured seed mass, total seed germination, light requirements for germination and mean time to germination for these 17 cacti species; in addition, we recorded seedling size and shape in 15 species. To test light requirements we performed germination experiments under laboratory conditions at 25/15°C (day/night temperatures) and under light or dark conditions. We also calculated seedling volume by measuring seedling height and width. A shape index was obtained by dividing height by width (a value of 1 indicates ‘globose’ seedlings, whereas, as this value increases, seedlings become ‘columnar’). We found no significant relationship between seed mass and any of the germination characteristics considered. However, species with heavier seeds produced bigger seedlings, which were more cylindrical. Adult growth was not totally determined by seedling ‘growth form’, because some species that had globose seedlings were columnar at the adult stage.

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          The plant traits that drive ecosystems: Evidence from three continents

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            The Ecology of Seeds

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              Seed Size and Shape Predict Persistence in Soil

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                Author and article information

                Journal
                Seed Science Research
                Seed Sci. Res.
                Cambridge University Press (CUP)
                0960-2585
                1475-2735
                March 2014
                February 17 2014
                March 2014
                : 24
                : 1
                : 71-77
                Article
                10.1017/S0960258513000366
                396f2f21-e196-4fef-a552-7eac77b2f36a
                © 2014

                https://www.cambridge.org/core/terms


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