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2015 ; 7
(ä): ä Nephropedia Template TP
gab.com Text
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Gradients of metabolite accumulation and redifferentiation of nutritive cells
associated with vascular tissues in galls induced by sucking insects
#MMPMID26209687
Carneiro RG
; Isaias RM
AoB Plants
2015[Jul]; 7
(ä): ä PMID26209687
show ga
Plant cells respond to abiotic and biotic stimuli, which generate adaptive
phenotypes in plant organs. In the case of plant galls, cell phenotypes are
adaptive for the gall inducer and assume characteristics mainly linked to its
protection and nutrition. Herein, the cytological development and histochemical
profile of Nothotrioza cattleiani galls, a sucking insect, on the leaves of
Psidium cattleianum are compared with those of other galls, especially N.
myrtoidis galls, searching for conserved and divergent alterations in cell fates
and cycles. Leaf cell fates are completely changed within galls, except for
epidermal cells, but the comparison between Nothotrioza spp. galls shows
conserved fates. Nevertheless, cytological development of N. cattleiani galls is
different from the standby-redifferentiation of N. myrtoidis galls. Starch and
lignins, and reducing sugars form centrifugal and centripetal gradients of
accumulation, respectively. Proteins, total phenolics, terpenoids,
proanthocyanidins and reactive oxygen species are detected in bidirectional
gradients, i.e. weak or undetectable reaction in the median cortical cells that
is gradually more intense in the cell layers towards the inner and outer surfaces
of the gall. True nutritive cells associated with vascular tissues, together with
the bidirectional gradients of metabolite accumulation, are herein reported for
the first time in insect galls. The globoid galls of N. cattleiani, though
macro-morphologically similar to the galls of N. myrtoidis, are distinct and
unique among insect galls, as far as the cellular, subcellular and histochemical
traits are concerned. Thus, the traits of the galls on P. cattleianum studied
herein represent the extended phenotypes of their inducers.