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How pollen and ovule development underlay dioecy in Chloroluma gonocarpa (Sapotaceae).
Judkevich, Marina Daniela; Luaces, Paula Alayón; Gonzalez, Ana M.
Afiliação
  • Judkevich MD; Instituto de Botánica del Nordeste, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional del Nordeste, Sargento Cabral 2131, CC 209, Corrientes, 3400, Argentina. marina-judkevich@hotmail.com.
  • Luaces PA; Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sargento Cabral 2131, CC 209, Corrientes, 3400, Argentina.
  • Gonzalez AM; Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sargento Cabral 2131, CC 209, Corrientes, 3400, Argentina.
J Plant Res ; 2024 Sep 16.
Article em En | MEDLINE | ID: mdl-39285082
ABSTRACT
Previous studies have determined that Chloroluma gonocarpa (Sapotaceae), is a species that has cryptic dioecy. This type of sexual system is characterized by flowers that are morphologically perfect (both sexual whorls are present) but functionally pistillate or staminate (in each type of flower one of the sexual whorls is non-functional). In C. gonocarpa the pistillate flowers present well-developed stigma, functional ovules, and staminodes, while the staminate flowers present a poorly developed stigma, collapsed ovules, and pollen-producing anthers. In angiosperms, the abortion of sexual organs can occur at different stages of development (from pre-meiosis to post-meiosis), that is why we conducted an anatomical analysis of both flower types at various developmental stages. Using light microscopy, we described the processes of sporogenesis and gametogenesis to establish when the staminate flowers lose their pistillate function. To achieve this, we collected, fixed, and processed the flowers following conventional anatomical techniques for observation under a light microscope. Our findings reveal that pollen development occurs only in staminate flowers, while ovule development begins in both types of flowers but ceases in staminate flowers due to post-meiosis abortion. In contrast, normal development continues in pistillate flowers. These results suggest that dioecy in C. gonocarpa may have arisen from a gynodioecious pathway.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Plant Res Assunto da revista: BOTANICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Argentina País de publicação: Japão

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Plant Res Assunto da revista: BOTANICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Argentina País de publicação: Japão