Structure of the pistil and pollen tube growth in Adansonia L. species: Implications for fertilization efficiency

Rasoamanana, Elysée N.; Razanamaro, Onja; Verdeil, Jean‐Luc; Montes, Fabienne; Ramavovololona, Perle; Danthu, Pascal

doi:10.1016/j.flora.2019.04.005

Cited by 4 publications

(2 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a conserved feature in angiosperms ( Herrero and Hormaza, 1996 ; Hormaza and Herrero, 1996 ; Lora et al, 2016 ) that was also observed in mango. As a consequence, there is a gradual reduction in the number of pollen tubes along the style, such as has been reported in Primula obconica ( Modlibowska, 1942 ), Nicotiana glauca ( Cruzan, 1986 ), Prunus avium ( Hormaza and Herrero, 1996 ), Polygala varyedae ( Castro et al, 2009 ), or Andansonia species ( Rasoamanana et al, 2019 ).…”

Section: Discussionmentioning

confidence: 68%

Ovary Signals for Pollen Tube Guidance in Chalazogamous Mangifera indica L.

et al. 2021

View full text Add to dashboard Cite

Most flowering plants show porogamy in which the pollen tubes reach the egg apparatus through the micropyle. However, several species show chalazogamy, an unusual pollen tube growth, in which the pollen tubes reach the embryo sac through the chalaza. While ovary signals for pollen tube growth and guidance have been extensively studied in porogamous species, few studies have addressed the process in chalazogamous species such as mango (Mangifera indica L.), one of the five most important fruit crops worldwide in terms of production. In this study, we characterize pollen–pistil interaction in mango, paying special attention to three key players known to be involved in the directional pollen tube growth of porogamous species such as starch, arabinogalactan proteins (AGPs), and γ-aminobutyric acid (GABA). Starch grains were observed in the style and in the ponticulus at anthesis, but their number decreased 1 day after anthesis. AGPs, revealed by JIM8 and JIM13 antibodies, were homogenously observed in the style and ovary, but were more conspicuous in the nucellus around the egg apparatus. GABA, revealed by anti-GABA antibodies, was specifically observed in the transmitting tissue, including the ponticulus. Moreover, GABA was shown to stimulate in vitro mango pollen tube elongation. The results support the heterotrophic growth of mango pollen tubes in the style at the expense of starch, similarly to the observations in porogamous species. However, unlike porogamous species, the micropyle of mango does not show high levels of GABA and starch, although they were observed in the ponticulus and could play a role in supporting the unusual pollen tube growth in chalazogamous species.

show abstract

Section: Discussionmentioning

confidence: 68%

Ovary Signals for Pollen Tube Guidance in Chalazogamous Mangifera indica L.

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Fertilization, with the formation of fruits and seeds, is directly related to the production of exudates from the stigma, promoting pollen grain adherence, hydration, germination and ultimately growth of the pollen tube (Kearns and Inouye , Shakya and Bhatla , Zheng et al , Rasoamanana et al ). These exudates are enzymes, principally esterases and peroxidases, and their presence is considered an indication of receptivity (Dafni and Maués , Souza et al ).…”

Section: Introductionmentioning

confidence: 99%

Morphoanatomy and stigma receptivity in Tillandsia L. (Bromeliaceae) occurring in Bahia, Brazil

Souza

Oliveira

Souza

et al. 2020

Nordic Journal of Botany

View full text Add to dashboard Cite

Species of Tillandsia L. are widely distributed in Brazilian ecosystems, and in the state of Bahia they can be found in the Atlantic Forest, Caatinga and Cerrado biomes. Studying the reproductive aspects of these species can support their management and conservation. In particular, stigma morphology is a conserved trait of Bromeliaceae and stigma receptivity can influence the success of pollination. The objective of this study was to characterize the morphoanatomy and classify the stigma types of Tillandsia species by means of light and scanning electron microscopy, as well as to evaluate the stigma receptivity by different methods and at three floral development stages. A total of 21 Tillandsia species found in Bahia were evaluated. The stigma receptivity was assessed with hydrogen peroxide (3%) and a solution of α‐naphthyl acetate. Four stigma types were observed: conduplicate‐spiral for the species of the Tillandsia subgen. Tillandsia, simple‐erect for species of T. subgen. Diaphoranthema, and simple‐truncate for the species of T. subgen. Phytarrhiza. The species of the T. subgen. Anoplophytum had three morphological types, conduplicate‐spiral, conduplicate‐patent and simple‐erect. All the species had trifid stigmas, monostratified epidermis, numerous idioblasts containing raphides in the fundamental parenchyma and an individual vascular bundle for each carpel. In all the species studied by the two methods of stigma receptivity the highest enzyme activity was observed during anthesis. The morphoanatomy of the stigma and style provides important information for the taxonomy of Tillandsia and the data on stigma receptivity can support studies of the reproduction and conservation of these species.

show abstract