Regulation of potato tuberization by daylength and gibberellins

Citation
V. Amador et al., Regulation of potato tuberization by daylength and gibberellins, INT J DEV B, 45, 2001, pp. S37-S38
Citations number
8
Categorie Soggetti
Cell & Developmental Biology
Journal title
INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY
ISSN journal
02146282 → ACNP
Volume
45
Year of publication
2001
Supplement
1
Pages
S37 - S38
Database
ISI
SICI code
0214-6282(2001)45:<S37:ROPTBD>2.0.ZU;2-W
Abstract
Tuberization of S. tuberosum ssp andigena is induced by short days (SD) and prevented by long days (LD) or by interruption of the long nights with a 3 0 min night break (SD+NB). Antisense inhibition of the StGA20ox1 gene, enco ding the GA 20-oxidase biosynthetic enzyme results in early tuberization in SD, but does not overcome the need of SD conditions for tuber induction. U sing RT-PCR differential display of leaves from plants grown under inductiv e (SD) and non-inductive (SD+NB) conditions we have isolated clone PHOR1 en coding a novel arm-repeat containing protein with homology to Drosophila ar madillo. PHOR1 mRNA oscillates with a diurnal rhythm and is up-regulated in plants induced for tuberization. Transgenic lines inhibited in PHOR1 expre ssion are semi-dwarf and show a reduced response to GAs, which is consisten t with a function of PHOR1 in GA signaling. These results indicate that cha nges in GA sensitivity are involved in mediating tuber induction.