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Review

Paving the Way for Fertilization: The Role of the Transmitting Tract

1
Dipartimento di Bioscienze, Università Degli Studi di Milano, 20133 Milano, Italy
2
LAQV Requimte, Sustainable Chemistry, Universidade do Porto, 4169-007 Porto, Portugal
3
Faculdade de Ciências da Universidade do Porto, Departamento de Biologia, Universidade do Porto, rua do Campo Alegre, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Alfonso Gutiérrez-Adán
Int. J. Mol. Sci. 2021, 22(5), 2603; https://doi.org/10.3390/ijms22052603
Received: 28 January 2021 / Revised: 1 March 2021 / Accepted: 2 March 2021 / Published: 5 March 2021
(This article belongs to the Special Issue Signaling in Plant Reproduction)
Angiosperm reproduction relies on the precise growth of the pollen tube through different pistil tissues carrying two sperm cells into the ovules’ embryo sac, where they fuse with the egg and the central cell to accomplish double fertilization and ultimately initiate seed development. A network of intrinsic and tightly regulated communication and signaling cascades, which mediate continuous interactions between the pollen tube and the sporophytic and gametophytic female tissues, ensures the fast and meticulous growth of pollen tubes along the pistil, until it reaches the ovule embryo sac. Most of the pollen tube growth occurs in a specialized tissue—the transmitting tract—connecting the stigma, the style, and the ovary. This tissue is composed of highly secretory cells responsible for producing an extensive extracellular matrix. This multifaceted matrix is proposed to support and provide nutrition and adhesion for pollen tube growth and guidance. Insights pertaining to the mechanisms that underlie these processes remain sparse due to the difficulty of accessing and manipulating the female sporophytic tissues enclosed in the pistil. Here, we summarize the current knowledge on this key step of reproduction in flowering plants with special emphasis on the female transmitting tract tissue. View Full-Text
Keywords: plant reproduction; reproductive tract; transmitting tissue; pollen tube growth; extracellular matrix; pollen tube guidance plant reproduction; reproductive tract; transmitting tissue; pollen tube growth; extracellular matrix; pollen tube guidance
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MDPI and ACS Style

Pereira, A.M.; Moreira, D.; Coimbra, S.; Masiero, S. Paving the Way for Fertilization: The Role of the Transmitting Tract. Int. J. Mol. Sci. 2021, 22, 2603. https://doi.org/10.3390/ijms22052603

AMA Style

Pereira AM, Moreira D, Coimbra S, Masiero S. Paving the Way for Fertilization: The Role of the Transmitting Tract. International Journal of Molecular Sciences. 2021; 22(5):2603. https://doi.org/10.3390/ijms22052603

Chicago/Turabian Style

Pereira, Ana M., Diana Moreira, Sílvia Coimbra, and Simona Masiero. 2021. "Paving the Way for Fertilization: The Role of the Transmitting Tract" International Journal of Molecular Sciences 22, no. 5: 2603. https://doi.org/10.3390/ijms22052603

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