ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Responsiveness to abscisic acid of embryos of dormant oat (Avena sativa) seeds. Involvement of ABA-inducible proteins (1991)

Corbineau, F. ; Poljakoff-Mayber, A. ; Côme, D.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 83 (1991), S. 0

add to mindlist on the mindlist

Details

ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Abscisic acid (ABA) inhibited the germination of embryos isolated from oat (Avena sativa L.) dormant seeds. The inhibition increased with ABA concentration. The embryos were 1 000 times more responsive to ABA at 30°C than at 10°C (30°C being the temperature at which dormancy is expressed). Exposure of embryos to 0.5 μM ABA for less than 8 h did not affect subsequent germination in water, and did not induce synthesis of new proteins. Exposure for at least 14 h was necessary to induce subsequent inhibition of germination. Such long exposure to ABA also affected protein synthesis. The molecular weights of the main ABA-inducible proteins were in the range between 44 and 24 kDa. Synthesis of small polypeptides, around 10 and 6 kDa was also induced. Synthesis of most of these ABA-inducible proteins disappeared when embryos were transferred to water. The general results suggest that the presence of ABA was necessary to maintain the synthesis of ABA-inducible proteins; on removal of ABA their synthesis ceased. No apparent correlation between these proteins and germination was revealed. However, a 26 kDa band was observed in the extract of control embryos imbibed for 24 h in water: this band was not present after 8 or 16 h imbibition and was also absent in extracts of ABA treated embryos.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb01273.x

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

A possible mechanism of high temperature dormancy regulation in seeds of Avena sativa L. (cv. Moyencourt) (1990)

Poljakoff-Mayber, A. ; Corbineau, F. ; Côme, D.

Springer

Plant growth regulation 9 (1990), S. 147-156

add to mindlist on the mindlist

Details

ISSN: 1573-5087

Keywords: dormancy ; germination inhibitory factor ; abscisic acid ; gibberellins ; Avena sativa L.

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Embryos of Avena sativa L. (cv. Moyencourt) show no ‘high temperature dormancy”. The dormancy is induced by the presence of endosperm-aleurone part of the seed. Germination of isolated embryos at 30°C can be prevented by ABA and the inhibition is reversed by GA. Inhibitors of GA synthesis also inhibit embryo germination. The embryos of dormant and non-dormant seeds vary greatly in their sensitivity to exogenous ABA. High temperature dormancy of the entire seeds can be relieved by low concentrations of ethanol. On the basis of these facts a hypothetic model is proposed showing how interaction between endogenous GA and ABA-like inhibitory substance, may regulate the “high temperature dormancy” of the seeds.