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Signaling in Pollen Tube Growth: Beyond the Tip of the Polarity Iceberg
Open AccessArticle

Pollination Type Recognition from a Distance by the Ovary Is Revealed Through a Global Transcriptomic Analysis

1
Institut de Recherche en Biologie Végétale, Université de Montréal, Montréal, QC H1X 2B2, Canada
2
CRCHU de Québec, Université Laval, Québec, QC G1V 4G2, Canada
3
National Research Council Canada, Montréal, QC H4P 2R2, Canada
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Plants 2019, 8(6), 185; https://doi.org/10.3390/plants8060185
Received: 1 May 2019 / Revised: 9 June 2019 / Accepted: 12 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Plant Reproduction)
Sexual reproduction in flowering plants involves intimate contact and continuous interactions between the growing pollen tube and the female reproductive structures. These interactions can trigger responses in distal regions of the flower well ahead of fertilization. While pollination-induced petal senescence has been studied extensively, less is known about how pollination is perceived at a distance in the ovary, and how specific this response is to various pollen genotypes. To address this question, we performed a global transcriptomic analysis in the ovary of a wild potato species, Solanum chacoense, at various time points following compatible, incompatible, and heterospecific pollinations. In all cases, pollen tube penetration in the stigma was initially perceived as a wounding aggression. Then, as the pollen tubes grew in the style, a growing number of genes became specific to each pollen genotype. Functional classification analyses revealed sharp differences in the response to compatible and heterospecific pollinations. For instance, the former induced reactive oxygen species (ROS)-related genes while the latter affected genes associated to ethylene signaling. In contrast, incompatible pollination remained more akin to a wound response. Our analysis reveals that every pollination type produces a specific molecular signature generating diversified and specific responses at a distance in the ovary in preparation for fertilization. View Full-Text
Keywords: long distance signaling; pollen–pistil interactions; pollen-associated molecular signatures; postmating isolation barriers long distance signaling; pollen–pistil interactions; pollen-associated molecular signatures; postmating isolation barriers
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MDPI and ACS Style

Joly, V.; Tebbji, F.; Nantel, A.; Matton, D.P. Pollination Type Recognition from a Distance by the Ovary Is Revealed Through a Global Transcriptomic Analysis. Plants 2019, 8, 185.

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