Even though green-ripening might not be an injury to bananas,
it is interesting to
observe the different
sensitivity
to
high CO2
between two cultivars in Musa family. This
m m
cultivars exhibit different tolerance to drought and diseases
(Thomas et al. 1998; Azhar and Heslop-Harrison 2008),
and it is believed that the alternation in the tolerance to the
stresses may be due to the alternation in the genotype, AAA
for bananas and ABB for plantains (Thomas et al. 1998).
Our previous study demonstrated that repressed degreening
of
bananas
ripening at
30°C was due to
the inhibition
of Chl degradation by high temperatures and correlated
to significant expression reduction in Chl degradation-related
genes,
SGR, NYC and PaO (Yang et al. 2009a). The green
ripening of bananas at high temperatures is a typical stay
green phenomenon, which can arise in one of five ways,
forming types A to E stay green phenomena (Thomas and
Howarth 2000). At temperatures above 24°C, green ripe
bananas displayed faster decrease in Fv/Fm
and in the