Abstract:
:Photometric analysis of chloroplast movements in various phytochrome (phy) mutants of Arabidopsis showed that phyA, B, and D are not required for chloroplast movements because blue light (BL)-dependent chloroplast migration still occurs in these mutants. However, mutants lacking phyA or phyB showed an enhanced response at fluence rates of BL above 10 micromol m-2 s-1. Overexpression of phyA or phyB resulted in an enhancement of the low-light response. Analysis of chloroplast movements within the range of BL intensities in which the transition between the low- and high-light responses occur (1.5-15 micromol m-2 s-1) revealed a transient increase in light transmittance through leaves, indicative of the high-light response, followed by a decrease in transmittance to a value below that measured before the BL treatment, indicative of the low-light response. A biphasic response was not observed for phyABD leaves exposed to the same fluence rate of BL, suggesting that phys play a role in modulating the transition between the low- and high-light chloroplast movement responses of Arabidopsis.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
DeBlasio SL,Mullen JL,Luesse DR,Hangarter RPdoi
10.1104/pp.103.029116subject
Has Abstractpub_date
2003-12-01 00:00:00pages
1471-9issue
4eissn
0032-0889issn
1532-2548pii
pp.103.029116journal_volume
133pub_type
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