Universidad Nacional del Nordeste, Instituto de Botánica del Nordeste, Consejo Nacional de Investigaciones Científicas y Técnicas, Sargento Cabral 2131, CC 209, 3400 Corrientes, Argentina.
Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Av. Libertad 5279, CC 209, 3400 Corrientes, Argentina.
An Acad Bras Cienc. 2022 Aug 1;94(3):e20210071. doi: 10.1590/0001-3765202220210071. eCollection 2022.
A comprehensive study on the fruit anatomy and development of Cordiera concolor was carried out to establish the origin of the gelatinous tissue surrounding the seeds at maturity. Cordiera currently belongs to tribe Cordiereae, forming part of the species-rich lineage called Gardenieae complex. Most genera of Gardenieae complex has many-seeded fleshy fruits, with seeds usually imbedded in a pulp, which historically was considered of a placental nature. For the histological analyses, fruits at different stages of development were fixed in formalin-acetic acid-alcohol and examined with light microscopy. The endocarp has no woody consistency, it is what classifies a fruit as berry. The pericarp is differentiated into three histological zones: 1) the exocarp, formed of the epidermis and the sub-epidermal tannin cells, 2) the mesocarp, consisting of parenchyma with tannins and druses, and 3) the endocarp, derived from the internal epidermis of the ovary. The placental tissue has little development during the formation of the pericarp. We concluded that the gelatinous tissue surrounding the seeds in the ripe fruit is formed of the mesocarp and endocarp. The present results disagree with the widely accepted conception of the placental origin of the gelatinous pulp surrounding the seeds in Gardenieae Complex species.
对山栀果的解剖结构和发育进行了全面研究，以确定成熟时种子周围胶状组织的起源。山栀现属于栀子族，是种类丰富的栀子族复合体的一部分。栀子族复合体的大多数属具有肉质多籽果实，种子通常嵌入果肉中，历史上被认为具有胎座性质。为了进行组织学分析，将处于不同发育阶段的果实用甲醛-乙酸-酒精固定，并通过光学显微镜进行检查。内果皮没有木质化的质地，这是将果实归类为浆果的特征。果皮分为三个组织区域：1）外果皮，由表皮和表皮下的单宁细胞组成，2）中果皮，由含有单宁和晶簇的薄壁组织组成，3）内果皮，由子房的内表皮衍生而来。胎座组织在果皮形成过程中发育很少。我们得出结论，成熟果实中种子周围的胶状组织是由中果皮和内果皮组成的。这一结果与广泛接受的栀子族复合体物种中种子周围胶状胎座起源的概念不一致。
