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Titolo
Abscisic acid delays chickpea germination by inhibiting water uptake and down-regulating genes encoding cell wall remodelling proteins
Autor(es)
Soggetto
ABA
Alpha-expansins
Germination
Water deficit
XTH
Fecha de publicación
2010
Resumen
Here, we compare the germination of chickpea
seeds when they were imbibed in mannitol and in ABA.
Radicle protusion was delayed by both treatments, however,
while the negative effect of mannitol, which severely
reduced earlier water uptake, was reversed after 24 h of
treatment, this was not the case of ABA, indicating a
specific effect of the hormone. Since germination depends
not only on the water content but also on cell wall extensibility,
we analyzed the rate of transcription of some genes
encoding cell wall remodelling proteins, known to be
involved in chickpea germination, in embryonic axes
excised from seeds imbibed in mannitol or in ABA. Our
results show that ABA and mannitol modify their transcription
patterns. Among the a-expansins, the proteins
encoded by CaEXPA-3 and CaEXPA-4 must be responsible
for the germination observed in mannitol-treated seeds,
because their transcripts appeared earlier on in mannitol than
in ABA-treated seeds. Moreover, it may further be
concluded that CaXTH-1 is one of the genes able of transcription
in very low hydrated seed.
URI
ISSN
0167-6903
DOI
10.1007/s10725-010-9463-z
Aparece en las colecciones
- GIPACYCV. Artículos [58]
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