Stability despite reduction: flower structure, patterns of receptacle elongation and organ fusion in Eriocaulon (Eriocaulaceae: Poales)статья
Статья опубликована в высокорейтинговом журнале
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Аннотация:Eriocaulaceae (Poales) dier from potentially related Xyridaceae in pattern of floral organarrangement relative to subtending bract (with median sepal adaxial). Some Eriocaulaceae possessreduced and non-trimerous perianth, but developmental data are insucient. We conducted aSEM investigation of flower development in three species of Eriocaulon to understand whetherorgan number and arrangement are stable in E. redactum, a species with a highly reduced calyx andreportedly missing corolla. Early flower development is similar in all three species. Male and femaleflowers are indistinguishable at early stages. Despite earlier reports, both floral types uniformlypossess three congenitally united sepals and three petals in E. redactum. Petals and inner stamensdevelop from common primordia. We assume that scanning electron microscopy should be used intaxonomic accounts of Eriocaulon to assess organ number and arrangement. Two types of corollareduction are found in Eriocaulaceae: suppression and complete loss of petals. Common petal–stamenprimordia in Eriocaulon do not co-occur with delayed receptacle expansion as in other monocotsbut are associated with retarded petal growth. The ‘reverse’ flower orientation of Eriocaulon isprobably due to strictly transversal lateral sepals. Gynoecium development indicates similarities ofEriocaulaceae with restiids and graminids rather than with Xyridaceae.