da Rosa Dorneles, K.,
Martins, A.C.,
Fernando, J.A.,
do Amarante, L.,
de Avila, L.A.,
Deuner, S. and
Dallagnol, L.J.
2020
Increased atmospheric
CO2 concentration
causes modification
of physiological, biochemical
and
histological characteristics
that affects rice-Bipolaris
oryzae interaction.
European Journal of Plant Pathology
DOI: 10.1007/s10658-020-01972-4.
NOTE:
Brown spot
occurs in all
rice-growing
regions
and can reduce
grain yields by
50% or more.
Brown spot is a grain
yield-reducing disease
in rice caused by
the fungus Bipolaris
oryzae.
It infects the panicle,
"causing sterility
of the floral organs,
reduction of the green leaf area
due to plant tissue chlorosis
and necrosis, and reduction of
photosynthesis, due both to
impaired light capture ability
and decreased mesophyll
capacity to fix CO2."
SUMMARY:
da Rosa Dorneles et al.
report that
"plants at 700 ppm [CO2]
showed lower severity
of brown spot,
regardless of the
evaluation time,
and smaller
lesions at 16 days
after inoculation,
compared to the plants
at 400 ppm CO2."
As the air's CO2 rises,
the negative impacts
of this disease
will be reduced,
translating to higher
grain yields to feed
an increasing world
population.
DETAILS:
Seven Brazilian researchers
grew two rice cultivars
(BRS Querencia and Inov CL).
They used
open-top chambers
located on the
Capão do Leão Campus
of the Federal University
of Pelotas
(Capão do Leão,
RS, Brazil).
They used ambient
(400 ppm)
or elevated
(700 ppm)
CO2 concentrations.
At phenological
stage V7-V8,
the scientists
inoculated
the leaves on
half of the plants
in each CO2 treatment
with Bipolaris oryzae.
They measured disease
severity at three different
intervals (3, 8 and 1
6 days after).