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2015 ; 10
(11
): e1082697
Nephropedia Template TP
gab.com Text
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English Wikipedia
Circadian changes in endogenous concentrations of indole-3-acetic acid,
melatonin, serotonin, abscisic acid and jasmonic acid in Characeae (Chara
australis Brown)
#MMPMID26382914
Beilby MJ
; Turi CE
; Baker TC
; Tymm FJ
; Murch SJ
Plant Signal Behav
2015[]; 10
(11
): e1082697
PMID26382914
show ga
Giant-celled Characeae (Chara australis Brown), grown for 4 months on 12/12 hr
day/night cycle and summer/autumn temperatures, exhibited distinct concentration
maxima in auxin (indole-3-acetic acid; IAA), melatonin and serotonin about 4 hr
after subjective daybreak. These concentration peaks persisted after 3 day
pretreatment in continuous darkness: confirming a circadian rhythm, rather than a
response to "light on." The plants pretreated for 3 d in continuous light
exhibited several large IAA concentration maxima throughout the 24 hr. The
melatonin and serotonin concentrations decreased and were less synchronized with
IAA. Chara plants grown on 9/15 hr day/night cycle for 4 months and winter/spring
temperatures contained much smaller concentrations of IAA, melatonin and
serotonin. The IAA concentration maxima were observed in subjective dark phase.
Serotonin concentration peaks were weakly correlated with those of IAA. Melatonin
concentration was low and mostly independent of circadian cycle. The "dark" IAA
concentration peaks persisted in plants treated for 3 d in the dark. The plants
pretreated for 3 d in the light again developed more IAA concentration peaks. In
this case the concentration maxima in melatonin and serotonin became more
synchronous with those in IAA. The abscisic acid (ABA) and jasmonic acid (JA)
concentrations were also measured in plants on winter regime. The ABA
concentration did not exhibit circadian pattern, while JA concentration peaks
were out of phase with those of IAA. The data are discussed in terms of crosstalk
between metabolic pathways.