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Influence of ploidy level on morphology, growth and drought susceptibility in Spathiphyllum wallisii

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Van Laere K., Franca S. C., Vansteenkiste H., Van Huylenbroeck J., Steppe K., Van Labeke M. C.

Acta Physiologiae Plantarum

2011

tom 33

nr 4

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.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Franca S. C.

1 Steppe K.

1 Van Huylenbroeck J.

1 Van Labeke M. C.

1 Van Laere K.

1 Vansteenkiste H.

1 2011

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Influence of ploidy level on morphology, growth and drought susceptibility in Spathiphyllum wallisii