Abstract
In this study, we analysed morphological, anatomical and physiological effects of polyploidisation in Spathiphyllum wallisii in order to evaluate possible interesting advantages of polyploids for ornamental breeding. Stomatal density was negatively correlated with increased ploidy level. Stomatal size increased in polyploids. Tetraploid Spathiphyllum plants had more ovate and thicker leaves. The inflorescence of tetraploids had a more ovate and thicker spathum, a more cylindrical spadix and a thicker but shorter flower stalk. Biomass production of the tetraploids was reduced, as expressed by lower total dry weights, and tetraploids produced fewer shoots and leaves compared with their diploid progenitors. Furthermore, tetraploid Spathiphyllum plants were more resistant to drought stress compared with diploid plants. After 15 days of drought stress, diploids showed symptoms of wilting, while the tetraploids showed almost no symptoms. Further, measurements of stomatal resistance, leaf water potential, relative water content and proline content indicated that the tetraploid genotypes were more resistant to drought stress compared with the diploids.
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Acknowledgments
The authors thank IWT-Flanders for their financial support and Deroose Plants and Floreac for kindly offering Spathiphyllum genotypes. The help of the technical staff at ILVO-Plant, Ghent University and PCS, namely Pepijn De Raeymaecker, Ingrid Proven, Annemie Stocké and Johan Ongena is highly appreciated.
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Communicated by B. Borkowska.
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Van Laere, K., França, S.C., Vansteenkiste, H. et al. Influence of ploidy level on morphology, growth and drought susceptibility in Spathiphyllum wallisii . Acta Physiol Plant 33, 1149–1156 (2011). https://doi.org/10.1007/s11738-010-0643-2
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DOI: https://doi.org/10.1007/s11738-010-0643-2