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2014 ; 26
(10
): 4053-66
Nephropedia Template TP
gab.com Text
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Myrosin idioblast cell fate and development are regulated by the Arabidopsis
transcription factor FAMA, the auxin pathway, and vesicular trafficking
#MMPMID25304201
Li M
; Sack FD
Plant Cell
2014[Oct]; 26
(10
): 4053-66
PMID25304201
show ga
Crucifer shoots harbor a glucosinolate-myrosinase system that defends against
insect predation. Arabidopsis thaliana myrosinase (thioglucoside glucohydrolase
[TGG]) accumulates in stomata and in myrosin idioblasts (MIs). This work reports
that the basic helix-loop-helix transcription factor FAMA that is key to stomatal
development is also expressed in MIs. The loss of FAMA function abolishes MI fate
as well as the expression of the myrosinase genes TGG1 and TGG2. MI cells have
previously been reported to be located in the phloem. Instead, we found that MIs
arise from the ground meristem rather than provascular tissues and thus are not
homologous with phloem. Moreover, MI patterning and morphogenesis are abnormal
when the function of the ARF-GEF gene GNOM is lost as well as when auxin efflux
and vesicular trafficking are chemically disrupted. Stomata and MI cells
constitute part of a wider system that reduces plant predation, the so-called
"mustard oil bomb," in which vacuole breakage in cells harboring myrosinase and
glucosinolate yields a brew toxic to many animals, especially insects. This
identification of the gene that confers the fate of MIs, as well as stomata,
might facilitate the development of strategies for engineering crops to mitigate
predation.