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Strigolactones affect responses to osmotic stress and fruit ripening in crop plants
Published on Apr 17, 2018922 Views
Strigolactones (SLs) are a class carotenoid-derived molecules, originally characterized as mediators of plant signaling to soil (micro)organisms, including parasitic plants, endomycorrhizal fungi, and
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Strigolactones affect responses to osmotic stress and fruit ripening in crop plants03:21
The discovery of strigolactones03:36
SLs mediate biotic interaction in the rhizosphere05:14
SLs: novel plant hormones05:44
SLs control shoot and root architecture07:06
The structure of strigolactones09:18
The SL biosynthetic pathway10:44
In rice and Arabidopsis, the SL receptor D14 is a hydrolase that cleaves SL upon binding12:26
D14-like proteins act as receptors of SLs in parasitic plants and possibly of unknown SL-like ligands in Arabidopsis15:06
SL mediates adaptation of plant architecture to phosphate starvation17:22
Drought induces reduction of SL levels in Lotus roots but not in shoots19:46
Ljccd7, a Lotus japonicus CCD7 (MAX3) mutant with reduced SL biosynthesis and concentration21:40
Ljccd7 is hypersensitive to osmotic (drought) stress22:38
Experiments with Lotus mutants confirm results obtained with Arabidopsis mutants24:04
Root- and shoot-specific SL control of drought stress sensitivity investigated in tomato24:59
Grafting reveals that root-specific SL downregulation actually reduces sensitivity to drought stress26:06
In WT/SL- heterografts, drought stress downregulates SL biosynthesis in the root but upregulates biosynthesis in the shoot28:53
SL depletion in roots affects free ABA concentration30:50
Endogenous and exogenous SL levels control stomatal sensitivity to ABA33:23
A model for SL modulation under drought stress35:56
miR156: a controller of phase transition in plants36:30
miR156 also controls responses to drought stress37:09
Overexpression of miR156 in tomato (var. MicroTom) causes stomatal closure37:25
miR156 is induced by drought only when endogenous SL is available37:48
Exogenous SL is sufficient to increase miR156 in the absence of stress38:35
SL are needed for drought-induced MIR156 transcription in shoots38:52
ABCG25 localizes to the plasma membrane upon ABA treatment and is internalized upon stress40:19
Exogenously applied ABA and GR24 increase ABCG25 expression and PM localization of sGFP:ABCG2540:45
SLs affect reproductive development41:57
Fruit ripening processes are controlled by ABA42:56
Exploring ABA-SL interactions in ripening grape berries43:50
GR24 negatively affects ABA concentration in ABA-treated grape berries44:35
GR24 induces ABA degradation45:00
Control of ABA transport maybe a recurrent SL-dependent mechanism to control ABA responses?45:39
Conclusions: a complex control of drought stress responses and reproductive development by SL46:37
Application of SLs in agriculture48:00
Credits50:33