Impact of climate change variables on young coconut seedlings (Cocos nucifera L.)
By: Kannan S.
Contributor(s): Mary Regina F (Guide).
Material type:
BookPublisher: Vellanikkara Academy of Climate Change Education and Research 2016Description: 125.Subject(s): Climate change education and research | Climate change adaptationDDC classification: 551.6 Online resources: Click here to access online Dissertation note: BSc-MSc (Integrated) Abstract: The research was conducted at ICAR-CPCRI, Kasaragod to study the
impact of the major climate change variables viz. elevated CO2 [ECO2] and
elevated temperature [ET] on growth parameters of coconut seedlings and to
study short term interactive effects of drought with climate change variables in
open top chamber facility. Seedlings were exposed to ambient (Shade net
condition), OTC control (atmospheric CO2 and temperature) [ECO2] (550 and
700 ppm), [ET] (3°C above ambient) and [ECO2+ET] (550 ppm CO2 + 3°C). In
each OTC, two set of seedlings were maintained at 100 per cent and 25 percent
field capacity, respectively. Seedlings in [ECO2] treatments had a positive effect
on plant height, leaf area and biomass production. [ECO2] increased
photosynthesis (PN), stomatal conductance and decreased osmotic potential (OP)
but there was no significant change in leaf water potential (LWP), Fv/Fm ratio
and transpiration rate. This showed improved water use efficiency in coconut
seedlings. [ECO2] led to higher carbonic anhydrase, peroxidase (POD) and
polyphenol oxidase (PPO) activity and increased the amount of chlorophyll
content and index (CI), soluble protein and phenolic content and lipid
peroxidation (LP), super oxide dismutase and epicuticular wax accumulation was
significantly less. [ET] decreased biomass by 27 per cent and caused reduction in
leaf area and PN. The seedlings under [ET] had the least LWP, chlorophyll
content, CI, and Fv/Fm ratio. LP was higher, so the POD and PPO were higher
under [ET], [ECO2+ ET] stimulated plant height, leaf area, PN and biomass. It
reduced Fv/Fm ratio and enhanced soluble protein. Water deficit stress decreased
plant PN, so it caused reduction in biomass and with leaf area under [ET] and no
significant difference was observed in OP. [ECO2] stimulated the growth of
plants under water deficit stress to certain extent and [ET] induced low growth of
coconut seedlings under water deficit was compensated by [ECO2].
| Item type | Current location | Collection | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | Reference Book | 551.6 KAN/IM (Browse shelf) | Not For Loan | 174049 |
BSc-MSc (Integrated)
The research was conducted at ICAR-CPCRI, Kasaragod to study the
impact of the major climate change variables viz. elevated CO2 [ECO2] and
elevated temperature [ET] on growth parameters of coconut seedlings and to
study short term interactive effects of drought with climate change variables in
open top chamber facility. Seedlings were exposed to ambient (Shade net
condition), OTC control (atmospheric CO2 and temperature) [ECO2] (550 and
700 ppm), [ET] (3°C above ambient) and [ECO2+ET] (550 ppm CO2 + 3°C). In
each OTC, two set of seedlings were maintained at 100 per cent and 25 percent
field capacity, respectively. Seedlings in [ECO2] treatments had a positive effect
on plant height, leaf area and biomass production. [ECO2] increased
photosynthesis (PN), stomatal conductance and decreased osmotic potential (OP)
but there was no significant change in leaf water potential (LWP), Fv/Fm ratio
and transpiration rate. This showed improved water use efficiency in coconut
seedlings. [ECO2] led to higher carbonic anhydrase, peroxidase (POD) and
polyphenol oxidase (PPO) activity and increased the amount of chlorophyll
content and index (CI), soluble protein and phenolic content and lipid
peroxidation (LP), super oxide dismutase and epicuticular wax accumulation was
significantly less. [ET] decreased biomass by 27 per cent and caused reduction in
leaf area and PN. The seedlings under [ET] had the least LWP, chlorophyll
content, CI, and Fv/Fm ratio. LP was higher, so the POD and PPO were higher
under [ET], [ECO2+ ET] stimulated plant height, leaf area, PN and biomass. It
reduced Fv/Fm ratio and enhanced soluble protein. Water deficit stress decreased
plant PN, so it caused reduction in biomass and with leaf area under [ET] and no
significant difference was observed in OP. [ECO2] stimulated the growth of
plants under water deficit stress to certain extent and [ET] induced low growth of
coconut seedlings under water deficit was compensated by [ECO2].
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