Abstract
Low light resulting from overcast skies during wet season is one of the important constraints in achieving high crop productivity. Field experiments were conducted to investigate the effect of low light stress on photosynthesis, chlorophyll accumulation, grain yield and yield components of rice. Five rice genotypes, Nirajo, Purnendu, Malliksalli, Megha Rice-1 and ASD-14 along with tolerant check, Swarnaprabha and susceptible check, IR-8 were grown under 100% and 75% of full sunlight intensity. Plants exposed to depleted radiation during reproductive stage were found to accumulate more of total chlorophyll but reduced Chl a/b ratio in the flag leaf and lesser net photosynthetic rate, stomatal conductance and rate of transpiration, which contributed to reduction in grain yield in all the genotypes Purnendu and Nirajo exhibited highest reduction in Chl a/b ratio and lesser reduction in starch accumulation in grains compared to others. Though there was significant reduction in grain yield of all genotypes, Purnendu and Nirajo exhibited relatively less grain yield loss which suggests there genetic competence to adapt to low light stress by retaining a reduced Chl a/b ratio and permitting insignificant curtailment in photosynthetic rate during reproductive stage under the subjected stress condition. Thus, they can be recommended for cultivation in regions prone to low light stress.
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Claims 10
Claim · model-written summary
Low light increased total chlorophyll in flag leaves.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- flag leafe0
- Treatment
- depleted radiatione0
- Outcome
- total chlorophylle0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants exposed to depleted radiation during reproductive stage were found to accumulate more of total chlorophyll but reduced Chl a/b ratio in the flag leaf”
e1“of rice”
Claim · model-written summary
Low light reduced the flag-leaf Chl a/b ratio.
- Taxon
- riceOryza sativae1
- Organ / stage
- flag leafe0
- Treatment
- depleted radiatione0
- Outcome
- Chl a/b ratioe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants exposed to depleted radiation during reproductive stage were found to accumulate more of total chlorophyll but reduced Chl a/b ratio in the flag leaf”
e1“of rice”
Claim · model-written summary
Low light reduced net photosynthetic rate, stomatal conductance and transpiration rate.
- Taxon
- riceOryza sativae1
- Treatment
- depleted radiatione2
- Outcome
- net photosynthetic rate, stomatal conductance and rate of transpiratione0
- Direction
- lessere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lesser net photosynthetic rate, stomatal conductance and rate of transpiration”
e1“of rice”
e2“Plants exposed to depleted radiation during reproductive stage”
Claim · model-written summary
Low light significantly reduced grain yield in all genotypes.
- Taxon
- riceOryza sativae1
- Treatment
- depleted radiatione2
- Outcome
- grain yielde0
- Direction
- reductione0
- Qualifier
- all genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was significant reduction in grain yield of all genotypes”
e1“of rice”
e2“depleted radiation”
Claim · model-written summary
Purnendu showed the highest reduction in Chl a/b ratio and less reduction in grain starch accumulation than others.
- Taxon
- riceOryza sativae1
- Material
- Purnendue0
- Outcome
- Chl a/b ratioe0
- Direction
- highest reductione0
- Qualifier
- lesser reduction in starch accumulation in grainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited highest reduction in Chl a/b ratio and lesser reduction in starch accumulation in grains compared to others”
e1“of rice”
Claim · model-written summary
Nirajo showed the highest reduction in Chl a/b ratio and less reduction in grain starch accumulation than others.
- Taxon
- riceOryza sativae1
- Material
- Nirajoe0
- Outcome
- Chl a/b ratioe0
- Direction
- highest reductione0
- Qualifier
- lesser reduction in starch accumulation in grainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited highest reduction in Chl a/b ratio and lesser reduction in starch accumulation in grains compared to others”
e1“of rice”
Claim · model-written summary
Purnendu had relatively less grain-yield loss under low light.
- Taxon
- riceOryza sativae1
- Material
- Purnendue0
- Outcome
- grain yield losse0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited relatively less grain yield loss”
e1“of rice”
Claim · model-written summary
Nirajo had relatively less grain-yield loss under low light.
- Taxon
- riceOryza sativae1
- Material
- Nirajoe0
- Outcome
- grain yield losse0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited relatively less grain yield loss”
e1“of rice”
Claim · model-written summary
The authors recommend Purnendu for cultivation in low-light-prone regions.
- Taxon
- riceOryza sativae2
- Material
- Purnendue0
- Outcome
- recommended for cultivation in regions prone to low light stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited relatively less grain yield loss”
e1“Thus, they can be recommended for cultivation in regions prone to low light stress.”
e2“of rice”
Claim · model-written summary
The authors recommend Nirajo for cultivation in low-light-prone regions.
- Taxon
- riceOryza sativae2
- Material
- Nirajoe0
- Outcome
- recommended for cultivation in regions prone to low light stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purnendu and Nirajo exhibited relatively less grain yield loss”
e1“Thus, they can be recommended for cultivation in regions prone to low light stress.”
e2“of rice”
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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.