TY  - JOUR
TI  - Regulation of potato tuberization by daylength and gibberellins
AU  - Amador, V
AU  - Bou, J
AU  - Martinez-Garcia, J
AU  - Monte, E
AU  - Rodriguez-Falcon, M
AU  - Russo, E
AU  - Prat, S
T2  - The International Journal of Developmental Biology
AB  - 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 30 min night break (SD+NB). Antisense inhibition of the StGA20ox1 gene, encoding the GA 20-oxidase biosynthetic enzyme results in early tuberization in SD, but does not overcome the need of SD conditions for tuber induction. Using RT-PCR differential display of leaves from plants grown under inductive (SD) and non-inductive (SD+NB) conditions we have isolated clone PHOR1 encoding a novel arm-repeat containing protein with homology to Drosophila armadillo. PHOR1 mRNA oscillates with a diurnal rhythm and is up-regulated in plants induced for tuberization. Transgenic lines inhibited in PHOR1 expression are semi-dwarf and show a reduced response to GAs, which is consistent with a function of PHOR1 in GA signaling. These results indicate that changes in GA sensitivity are involved in mediating tuber induction.
PY  - 2001
VL  - 45
IS  - S1
SP  - S37
EP  - S38
J2  - Int. J. Dev. Biol.
LA  - en
SN  - 0214-6282
SN  - 1696-3547
UR  - https://ijdb.ehu.eus/article/01450037
Y2  - 2024/11/05/15:22:21
ER  -