Comparative study of anther development, microsporogenesis and microgametogenesis in species of Corchorus , Heliocarpus , Luehea and Triumfetta Malvaceae: Grewioideae) from South America.

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Author(s): Lattar, E^1,2 (AUTHOR) ; Galati, BG³ (AUTHOR); Ferrucci, MS^1,2 (AUTHOR)
Source:
New Zealand Journal of Botany. Dec2014, Vol. 52 Issue 4, p429-445. 17p.
Subject Terms:
*COMPARATIVE studies; *GAMETOGENESIS; *PLANT species; *POLLEN; *CELL differentiation; *PLANTS

Additional Information
- Abstract:
  Anther development, microsporogenesis and microgametogenesis of six species of the generaCorchorus, Heliocarpus,LueheaandTriumfettawere analysed. The genera were found to share the following characters: ontogeny of anther wall of basic type; simultaneous microsporogenesis, resulting mainly in tetrahedral tetrads; secretory tapetum and pollen grains shed at the bicellular stage. Moreover, the characters that differentiate them are: presence of uninucleate tapetal cells inHeliocarpusandTriumfetta; binucleate cells inCorchorusand multinucleate cells inLuehea; differentiation of the thickenings of the endothecium at free microspores stage inCorchorus,HeliocarpusandTriumfetta, whereas inLueheadifferentiation occurs at the mature pollen grains stage; late disintegration of sporogenous tissue cell walls inLuehea; and the presence of orbicules, absent only inCorchorus. This is the first embryological report of the Grewioideae subfamily, contributing to the characterization of the genera studied. The results are discussed in relation to the known data for the family. [ABSTRACT FROM AUTHOR]