Abstract:
:We have investigated events which take place in the developing barley (Hordeum vulgare L.) embryo during its acquisition of desiccation tolerance. Excised embryos are capable of precocious germination as early as 8 d after pollination (DAP). At this age, however, they are not capable of resisting a desiccation treatment which induces a loss of 96-98% of their initial water content. At 16 DAP the embryos germinate despite the drastic drying treatment. The pattern of in-vivo and in-vitro proteins synthesized by the developing embryos from 12 DAP (desiccation-intolerant) and 16 DAP (desiccation-tolerant) were compared. A set of 25-30 proteins was identified which is denovo synthesized or enhanced during the developmental period leading to desiccation tolerance. Abscisic acid (ABA; 100 μM) applied in vitro for 5 d to 12-DAP embryos induces desiccation tolerance and represses a subset of polypeptides preferentially associated with 16-DAP embryos. During in vitro culture of barley embryos ABA stimulates the appearance of a set of proteins and prevents the precocious germination allowing embryogenesis to continue in vitro. It also suppresses a set of germination-related proteins which appear 4 h after the incubation of the dissected embryo on a germination medium without ABA. Almost all mRNAs remain functional for translation when isolated embryos are dried at the desiccation-intolerant and tolerant stages of embryo development.
journal_name
Plantajournal_title
Plantaauthors
Bartels D,Singh M,Salamini Fdoi
10.1007/BF00393069subject
Has Abstractpub_date
1988-10-01 00:00:00pages
485-92issue
4eissn
0032-0935issn
1432-2048journal_volume
175pub_type
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