Abstract
Abstract Salinity is a widespread soil problem limiting productivity of oilseed crops worldwide. Reduction in growth generally associated with decline in photosynthesis. Accumulation of osmo‐protectants such as glycinebetaine ( GB ) permits the plant to cope with salt stress. This study was aimed to understand the mechanism by which exogenous GB application improves photosynthetic capacity and salt tolerance in two diverse lines of canola differing in salt tolerance using chlorophyll fluorescence technique. Glycinebetaine was applied as foliarly or through rooting medium to two canola lines Dunkeld and Cyclone that were grown under non‐saline or saline conditions. Root‐applied GB caused adverse effects whereas foliar application of GB was effective in improving growth of canola cultivars. However, the response of salt‐tolerant cultivar Dunkeld was stronger than that of salt sensitive Cyclone. Foliar application of GB improved accumulation of proline and plant water status. Application of GB enhanced the photosynthetic CO 2 fixation, stomatal conductance ( g s ) and water‐use efficiency. The tolerant lines Dunkeld had more responsive to GB application. Chlorophyll fluorescence measurements ( F o , F m , F v , F o / F m , F v / F o and F v / F m ratios) revealed that salt stress reduced energy trapping efficiency by damaging oxygen evolving complex, over reduction of Q A resulting in occurrence of chronic photoinhibition. However, exogenous GB protected the oxygen evolving centre of PSII and maintains activity of PSII . Although root‐applied GB adversely affected the growth of canola plants, it did not have any adverse effect on PSII photochemistry. Moreover, fluorescence parameters could provide a rapid means for determining salt tolerance in canola and could be a rapid and sensitive test to identify genotypes highly tolerant to salt stress.
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Claims 13
Claim · model-written summary
Root applied glycinebetaine harmed canola growth.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- Root‐applied GBe0
- Outcome
- growthe0
- Direction
- adverse effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Root‐applied GB caused adverse effects whereas foliar application of GB was effective in improving growth of canola cultivars”
Claim · model-written summary
Foliar glycinebetaine improved canola growth.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- foliar application of GBe0
- Outcome
- growthe0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of GB was effective in improving growth of canola cultivars”
Claim · model-written summary
Dunkeld responded more strongly than Cyclone.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Dunkelde0
- Outcome
- responsee0
- Direction
- strongere0
- Comparator
- Cyclonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the response of salt‐tolerant cultivar Dunkeld was stronger than that of salt sensitive Cyclone”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Foliar glycinebetaine improved proline accumulation and plant water status.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Foliar application of GBe0
- Outcome
- accumulation of proline and plant water statuse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of GB improved accumulation of proline and plant water status”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Glycinebetaine increased photosynthetic CO2 fixation, stomatal conductance and water use efficiency.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Application of GBe0
- Outcome
- photosynthetic CO 2 fixation, stomatal conductance ( g s ) and water‐use efficiencye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of GB enhanced the photosynthetic CO 2 fixation, stomatal conductance ( g s ) and water‐use efficiency”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Dunkeld was more responsive to glycinebetaine.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Dunkelde0
- Outcome
- more responsive to GB applicatione0
- Direction
- more responsivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tolerant lines Dunkeld had more responsive to GB application”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Salt stress reduced energy trapping efficiency.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- salt stresse0
- Outcome
- energy trapping efficiencye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt stress reduced energy trapping efficiency by damaging oxygen evolving complex”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Salt stress damaged the oxygen evolving complex.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- salt stresse0
- Outcome
- oxygen evolving complexe0
- Qualifier
- damaging oxygen evolving complexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt stress reduced energy trapping efficiency by damaging oxygen evolving complex”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Salt stress caused chronic photoinhibition through over reduction of QA.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- chronic photoinhibitione0
- Qualifier
- over reduction of Q Ae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“over reduction of Q A resulting in occurrence of chronic photoinhibition”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Exogenous glycinebetaine protected the PSII oxygen evolving centre.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- exogenous GBe0
- Outcome
- oxygen evolving centre of PSIIe0
- Direction
- protectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GB protected the oxygen evolving centre of PSII and maintains activity of PSII”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Exogenous glycinebetaine maintained PSII activity.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- exogenous GBe0
- Outcome
- activity of PSIIe0
- Direction
- maintainse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GB protected the oxygen evolving centre of PSII and maintains activity of PSII”
t0“canola lines Dunkeld and Cyclone”
Claim · model-written summary
Root applied glycinebetaine did not harm PSII photochemistry.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- root‐applied GBe0
- Outcome
- PSII photochemistrye0
- Direction
- did not have any adverse effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root‐applied GB adversely affected the growth of canola plants, it did not have any adverse effect on PSII photochemistry”
Claim · model-written summary
Fluorescence parameters may rapidly identify salt tolerant canola genotypes.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- determining salt tolerancee0
- Value
- rapide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluorescence parameters could provide a rapid means for determining salt tolerance in canola and could be a rapid and sensitive test to identify genotypes highly tolerant to salt stress”
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glycine betaine · physiology: photosynthesis · Brassica napus (oilseed rape)Results agree
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glycine betaine · growth · Brassica napus (oilseed rape)Results agree
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See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.