Seed germination of Arabidopsis thaliana phyA/phyB double mutants is under phytochrome control

被引:58
作者
Poppe, C [1 ]
Schafer, E [1 ]
机构
[1] UNIV FREIBURG,INST BIOL 2,D-79104 FREIBURG,GERMANY
关键词
D O I
10.1104/pp.114.4.1487
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
We examined the photocontrol of seed germination in the phyA/ phyB double mutants of Arabidopsis thaliana seeds. Dormant phyA/ phyB seeds showed a red/far-red light (R/FR)-reversible induction of seed germination. This suggests the involvement of at least one other phytochrome, phyC, D, and/or E, in controlling seed germination. We designated this spectrally active phytochrome in phyA/ phyB as phyX. The full reversibility of the R-induced germination by subsequent FR pulses, and the observation that the response is reversible by FR, even after a 3-h R treatment, indicates that this phyX response belongs to the low-fluence-response type. Thus, this phyX response is functionally related to phyB-mediated responses. However, in contrast to phyB-controlled seed germination, this phyX-mediated response needs a prolonged imbibition period and exhibits reversibility kinetics different from that needed for phyB. Furthermore, this phyX response requires a prolonged irradiation time and shows a fluence rate response dependency, showing a similarity to the high irradiance response of photomorphogenesis. Thus, phyX, with regard to its control of seed germination, is a functionally new phytochrome that shares some characteristics of both phyA- and phyB-mediated responses.
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页码:1487 / 1492
页数:6
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