Sharma, S.,
Walia, S.,
Rathore, S.,
Kumar, P. and
Kumar, R.
2020
Combined effect of elevated CO2
and temperature on growth, biomass
and secondary metabolite of
Hypericum perforatum L.
in a western Himalayan region.
Journal of Applied Research
on Medicinal and Aromatic Plants
16: 100239.
NOTE:
St. John's Wort
is an herbaceous
perennial plant,
used as a herbal
medicine
for depression,
and has an
extensive
root system.
Sharma et al. (2020)
examined the response
of this plant to different
treatments of CO2,
temperature and
compost application.
SUMMARY:
Both the individual and
combined temperature
and CO2 treatments
improved the
development
and yield
of H. perforatum.
Relative to
the ambient
control treatment,
elevated CO2,
elevated temperature
and the application
of compost
all exerted
positive effects
on the growth of
H. perforatum
(see Figure 1).
As illustrated in Figure 2,
the total dry biomass
of St. John's Wort plants
were enhanced
by 28%, 27% and 36%
at the
100% flowering stage
and by 44%, 56% and 55%
at seed maturity
in the FACE, FATI and
FATI + FACE treatments,
respectively.
DETAILS:
Work was doine at
the CSIR-Institute of
Himalayan Bioresource
Technology in Palampur,
India.
Across two separate
growing seasons,
the authors subjected
H. perforatum to
ambient (400 ppm)
or elevated (550 ppm,
applied during daylight
hours only) CO2,
ambient (normal air
temperature)
or elevated
(+2.5-3.0 °C
above ambient)
temperature,
and no (zero
compost added)
or full (100 g per pot
added at two stages)
application of
vermicompost.
The experiment
was outdoors,
with the plants
grown in large pots
in a field setting.
Elevated CO2 concentrations
and elevated temperatures
were achieved and maintained
using Free-air CO2 Enrichment
(FACE) and Free-air Temperature
Increase (FATI) technology,
using infrared heating units.
Several growth-related
measurements were made
at 100% flowering (140 DAE)
and seed maturity (240 DAE)
stages in each growing season.
CHART BELOW:
The percentages
shown in blue
and orange indicate
the change in
total dry biomass
(relative to
ambient conditions)
at 100% flowering
and seed maturity
stages, respectively.
Ambient = ambient temperature
and ambient CO2,
FACE = ambient temperature
and elevated CO2,
FATI = elevated temperature
and ambient CO2
FACE + FATI = elevated temperature
and elevated CO2 conditions.
