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Isabella Veríssimo Nader Haddad
Federal University of Rio de Janeiro
4Publications
2H-index
12Citations
Publications 4
Newest
#1Isabella Veríssimo Nader Haddad (UFRJ: Federal University of Rio de Janeiro)H-Index: 2
#2Bárbara de Sá-Haiad (UFRJ: Federal University of Rio de Janeiro)H-Index: 3
Last.Silvia Rodrigues Machado (UNESP: Sao Paulo State University)H-Index: 20
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Reproduction in flowering plants is closely related to the megagametophyte, since the megagametophyte is involved in pollen tube reception and contains the two female gametes—egg cell and central cell. Previous conventional light microscopy methods have shown that female sterility in perfect flowers of Maytenus obtusifolia is associated with the occurrence of sterile ovules whose megagametophytes have hypertrophied synergids. Here, using transmission electron microscopy and cytochemical methods,...
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#1Isabella Veríssimo Nader Haddad (UFRJ: Federal University of Rio de Janeiro)H-Index: 2
#2Bárbara de Sá-Haiad (UFRJ: Federal University of Rio de Janeiro)H-Index: 3
Last.Silvia Rodrigues Machado (UNESP: Sao Paulo State University)H-Index: 20
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Perfect flowers of Maytenus obtusifolia have partial sterility of pollen grains, resulting in collapsed and developed free microspores. However, the cellular events resulting in partial male sterility have not been determined. In pistillate flowers of this species, male sterility is related to the premature programmed cell death (PCD) in tapetum and sporogenic cells. The process occurs through autophagy via macroautophagy and massive autophagy and is associated with sporophytic cytoplasmic male ...
1 CitationsSource
#1Isabella Veríssimo Nader Haddad (UFRJ: Federal University of Rio de Janeiro)H-Index: 2
#2Lygia Dolores Ribeiro de Santiago-Fernandes (UFRJ: Federal University of Rio de Janeiro)H-Index: 3
Last.Silvia Rodrigues Machado (UNESP: Sao Paulo State University)H-Index: 20
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Programmed cell death (PCD) is defined as a sequence of genetically regulated events leading to controlled and organised cellular degradation. It plays a vital role in plant development; however, little is known about the role of PCD in reproductive development. Sterility in pistillate flowers of Maytenus obtusifolia Mart. has been shown to be related to cytoplasmic male sterility (CMS) based on reproductive biology and anatomical analysis. The recurrent PCD led us to investigate changes in the ...
3 CitationsSource
#1Cristine Rodrigues Benevides (UFRJ: Federal University of Rio de Janeiro)H-Index: 3
#2Isabella Veríssimo Nader Haddad (UFRJ: Federal University of Rio de Janeiro)H-Index: 2
Last.Heloisa Alves de Lima (UFRJ: Federal University of Rio de Janeiro)H-Index: 6
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‘Gynodioecy–dioecy’ is one of the pathways by which dioecy can arise from hermaphroditism. Studies on sex determination and development of gynodioecious systems have focused on temperate and/or annual species. Little is known about the evolutionary dynamics of gynodioecy and dioecy in perennial tropical species, where these systems have more frequently evolved. Maytenus obtusifolia is an abundant species in restingas in southeastern Brazil. The sexual system of M. obtusifolia was investigated by...
8 CitationsSource
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