Abscisic-acid-induced drought tolerance in Funaria hygrometrica Hedw. |
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Authors: | Olaf Werner Rosa Maria Ros Espín Martin Bopp Rainer Atzorn |
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Institution: | (1) Botanisches Institut der Universität Heidelberg, INF 360, W-6900 Heidelberg, Germany;(2) Present address: Departamento de Biología Vegetal (Botanica), Facultad de Biología, Universidad de Murcia, E-30071 Murcia, Spain |
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Abstract: | Three-week-old protonemata of Funaria hygrometrica Hedw. cultivated in Petri dishes tolerate slow drying (24 h to complete dryness) but not rapid drying (1h to complete dryness). Slowly dried mosses show, on a dry-weight basis, a sixfold increase in abscisic-acid (ABA) contents during the drying process. Rehydrated, slowly dried protonemata have the ability to tolerate subsequent rapid drying. When ABA is added to three-week-old protonemata at a concentration of 10 M for 16 h, tolerance to rapid drying is induced. These data indicate that the induction of drought tolerance in Funaria hygrometrica is mediated by ABA. Mosses treated with ABA loose their water as fast as controls do; therefore, ABA does not act via reduced water loss. However, induction of synthesis of new proteins by ABA may form an important part of the drought tolerance because 10 M cycloheximide inhibits the ABA-mediated tolerance to rapid drying.Abbreviations ABA
abscisic acid
- CHI
cycloheximide
- DW
dry weight
- FW
fresh weight
- RWL
relative water loss
This work was supported by grants from the Deutsche Forschungs-gemeinschaft and by a NATO fellowship awarded to R.M. Ros Espin. |
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Keywords: | Abscisic acid (desiccation tolerance) Desiccation tolerance Funaria |
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