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Multiple features that distinguish unilateral incongruity and self-incompatibility in the tomato clade.
Plant J 2010; 64(3):367-78PJ

Abstract

Wild tomato species in Solanum Section Lycopersicon often exhibit two types of reproductive barriers: self-incompatibility (SI) and unilateral incompatibility or incongruity (UI), wherein the success of an inter-specific cross depends on the direction of the cross. UI pollen rejection often follows the 'SI × SC' rule, i.e. pistils of SI species reject the pollen of SC (self-compatible) species but not vice versa, suggesting that the SI and UI pollen rejection mechanisms may overlap. In order to address this question, pollen tube growth was measured after inter-specific crosses using wild tomato species as the female parents and pollen from cultivated tomato (Solanum lycopersicum). Two modes of UI pollen rejection, early and late, were observed, and both differed from SI pollen rejection. The structure and expression of known stylar SI genes were evaluated. We found that S-RNase expression is not required for either the early or late mode of UI pollen rejection. However, two HT family genes, HT-A and HT-B, map to a UI QTL. Surprisingly, we found that a gene previously implicated in SI, HT-B, is mutated in both SI and SC S. habrochaites accessions, and no HT-B protein could be detected. HT-A genes were detected and expressed in all species examined, and may therefore function in both SI and UI. We conclude that there are significant differences between SI and UI in the tomato clade, in that pollen tube growth differs between these two rejection systems, and some stylar SI factors, including S-RNase and HT-B, are not required for UI.

Authors+Show Affiliations

Department of Biology, Colorado State University, Fort Collins, CO 80523-1878, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

20804455

Citation

Covey, Paul A., et al. "Multiple Features That Distinguish Unilateral Incongruity and Self-incompatibility in the Tomato Clade." The Plant Journal : for Cell and Molecular Biology, vol. 64, no. 3, 2010, pp. 367-78.
Covey PA, Kondo K, Welch L, et al. Multiple features that distinguish unilateral incongruity and self-incompatibility in the tomato clade. Plant J. 2010;64(3):367-78.
Covey, P. A., Kondo, K., Welch, L., Frank, E., Sianta, S., Kumar, A., ... Bedinger, P. A. (2010). Multiple features that distinguish unilateral incongruity and self-incompatibility in the tomato clade. The Plant Journal : for Cell and Molecular Biology, 64(3), pp. 367-78. doi:10.1111/j.1365-313X.2010.04340.x.
Covey PA, et al. Multiple Features That Distinguish Unilateral Incongruity and Self-incompatibility in the Tomato Clade. Plant J. 2010;64(3):367-78. PubMed PMID: 20804455.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multiple features that distinguish unilateral incongruity and self-incompatibility in the tomato clade. AU - Covey,Paul A, AU - Kondo,Katsuhiko, AU - Welch,Lilli, AU - Frank,Eric, AU - Sianta,Shelley, AU - Kumar,Aruna, AU - Nuñez,Reynaldo, AU - Lopez-Casado,Gloria, AU - van der Knaap,Esther, AU - Rose,Jocelyn K C, AU - McClure,Bruce A, AU - Bedinger,Patricia A, Y1 - 2010/10/01/ PY - 2010/9/1/entrez PY - 2010/9/2/pubmed PY - 2011/2/12/medline SP - 367 EP - 78 JF - The Plant journal : for cell and molecular biology JO - Plant J. VL - 64 IS - 3 N2 - Wild tomato species in Solanum Section Lycopersicon often exhibit two types of reproductive barriers: self-incompatibility (SI) and unilateral incompatibility or incongruity (UI), wherein the success of an inter-specific cross depends on the direction of the cross. UI pollen rejection often follows the 'SI × SC' rule, i.e. pistils of SI species reject the pollen of SC (self-compatible) species but not vice versa, suggesting that the SI and UI pollen rejection mechanisms may overlap. In order to address this question, pollen tube growth was measured after inter-specific crosses using wild tomato species as the female parents and pollen from cultivated tomato (Solanum lycopersicum). Two modes of UI pollen rejection, early and late, were observed, and both differed from SI pollen rejection. The structure and expression of known stylar SI genes were evaluated. We found that S-RNase expression is not required for either the early or late mode of UI pollen rejection. However, two HT family genes, HT-A and HT-B, map to a UI QTL. Surprisingly, we found that a gene previously implicated in SI, HT-B, is mutated in both SI and SC S. habrochaites accessions, and no HT-B protein could be detected. HT-A genes were detected and expressed in all species examined, and may therefore function in both SI and UI. We conclude that there are significant differences between SI and UI in the tomato clade, in that pollen tube growth differs between these two rejection systems, and some stylar SI factors, including S-RNase and HT-B, are not required for UI. SN - 1365-313X UR - https://www.unboundmedicine.com/medline/citation/20804455/Multiple_features_that_distinguish_unilateral_incongruity_and_self_incompatibility_in_the_tomato_clade_ L2 - https://doi.org/10.1111/j.1365-313X.2010.04340.x DB - PRIME DP - Unbound Medicine ER -