mRNA levels of SSU, quicker accumulation in malondialdehyde
(MDA) as well, than the fruit ripening at
16–20°C,
indicating
that the senescence of the fruit peel was not
inhibited
while Chl degradation
was exclusively
retarded.
These
characteristics indicate that green
ripening induced
by
high temperature is a typical C stay-green phenomenon
as many stay-green mutants that are deficient in Chl degradation
(Vezitskii
2000; Park
et
al.
2007; Nakajima
et
al.
2012).
However,
in this work, 20% CO
did not suppress the
expression of Chl degradation genes in banana and plantain
fruits , but retarded the decrease in Chl fluorescence(Fv/Fm)
and in the mRNA levels of SSU in both fruits, particularly
for bananas, whose Fv/Fm
values stayed much higher levels
than the levels of the bananas ripening in regular air (control)
and the 20% CO2
treated plantains (Fig. 5-A and B).
In addition, the analysis of the chloroplast ultrastructure in
the peel tissue of bananas and plantains indicate that 20%
CO2
treatment delayed the chloroplast breakdown in the
peel tissue of bananas, while the chloroplasts broke down