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 μM 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 μM cycloheximide inhibits the ABA-mediated tolerance to rapid drying.
journal_name
Plantajournal_title
Plantaauthors
Werner O,Ros Espín RM,Bopp M,Atzorn Rdoi
10.1007/BF00201503subject
Has Abstractpub_date
1991-12-01 00:00:00pages
99-103issue
1eissn
0032-0935issn
1432-2048journal_volume
186pub_type
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