Influence of ploidy level on morphology,growth and drought susceptibility in <Emphasis Type="Italic">Spathiphyllum wallisii</Emphasis> |
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Authors: | Katrijn Van Laere Soraya C França Hein Vansteenkiste Johan Van Huylenbroeck Kathy Steppe Marie-Christine Van Labeke |
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Institution: | (1) Plant Sciences Unit, Institute for Agricultural and Fisheries Research (ILVO), Applied Genetics and Breeding, Caritasstraat 21, 9090 Melle, Belgium;(2) Faculty of BioScience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;(3) Research Centre for Ornamental Plants (PCS), Schaessestraat 18, 9070 Destelbergen, Belgium;(4) Faculty Biosciences and Landscape Architecture, University College Ghent, Ghent University Association, Voskenslaan 270, 9000 Ghent, Belgium |
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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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