Biotic Stress/Applied Plant Bio

Abstract

CS-13-3 - Pre-zygotic barriers in inter-specific crosses: a leading role for small cysteine-rich protein attractant in wild potatoes species ?

Monday, July 16
1:43 PM - 2:03 PM

Small secreted cysteine-rich proteins (CRPs) combine a strict and stable cysteine backbone and variable inter-cysteine segments, ensuring conservation of their 3D structure and biological function, and allow evolution of specific recognition sites. Several of these CRPs have been shown to control key pollen-pistil interactions, suggesting a multi-step barrier system that include self-incompatibility, pollen-style interactions, sperm discharge, and gamete fusion. The most emblematic example of species-specific CRP function in reproduction remains the LURE family, controlling directional guidance of pollen tubes (PTs) in Torenia and Arabidopsis. With more than 100 wild species overlapping wide distribution areas from the southwestern United States to central Argentina and Chile, the wild potatoes (Solanum sect. Petota) are an exquisite playground in reproductive isolation barriers. Although naturally isolated by geographical or ecological niches, wild potato populations are also found in sympatry, share a common flowering window, and are pollinated by numerous bumble bees species (Bombus spp.). In 2011, we collected individuals from several tuberous wild potatoes species in the province of Salta in northwestern Argentina, a known sympatric zone from previous studies and herbarium specimens. To our surprise, although they coexist sympatrically and have physiological and genetic capabilities to hybridize, they nonetheless displayed strong reproductive isolation barriers in the field since obvious hybrids were not found. Here, we will explore two important pre-zygotic barriers in wild potatoes inter-specific crosses, e. g., the effect of heterospecific pollen tube growth in the style and, using microfluidic devices, the species preference for ovular chemoattraction cues in pollen tube guidance assays.


 

Co-Authors

Valentin Joly – Universite de Montreal

Daniel P. Matton

Professor
Université de Montréal

Presentation(s):

Send Email for Daniel Matton


Assets

CS-13-3 - Pre-zygotic barriers in inter-specific crosses: a leading role for small cysteine-rich protein attractant in wild potatoes species ?



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for Pre-zygotic barriers in inter-specific crosses: a leading role for small cysteine-rich protein attractant in wild potatoes species ?