Abstract
BACKGROUND: Three drought yield QTLs, qDTY 2.2, qDTY 3.1, and qDTY 12.1 with consistent effect on grain yield under reproductive stage drought stress were pyramided through marker assisted breeding with the objective of improving the grain yield of the elite Malaysian rice cultivar MR219 under reproductive stage drought stress. Foreground selection using QTL specific markers, recombinant selection using flanking markers, and background selection were performed. BC1F3-derived lines with different combinations of qDTY 2.2 , qDTY 3.1, and qDTY 12.1 were evaluated under both reproductive stage drought stress and non-stress during the dry seasons of 2013 and 2014 at IRRI. RESULTS: The grain yield reductions in the stress trials compared to non-stress trials ranged from 79 to 93%. In the stress trials, delay in days to flowering and reduction in plant height were observed. In both seasons, MR219 did not produce any yield under stress, however it produced a yield of 5917 kg ha(-1) during the 2013 dry season and 8319 kg ha(-1) during the 2014 dry season under non-stress. Selected introgressed lines gave a yield advantage of 903 to 2500 kg ha(-1) over MR219 under reproductive stage drought stress and a yield of more than 6900 kg ha(-1) under non-stress during the 2014 dry season. Among lines with single qDTY, lines carrying qDTY 2.2 provided a higher yield advantage under reproductive stage drought stress in the MR219 background. Two-qDTY combinations (qDTY 3.1+ qDTY 2.2 and qDTY 3.1+ qDTY 12.1) performed better than lines with three qDTY combinations, indicating the absence of positive interactions between the three qDTYs. CONCLUSION: We successfully developed drought-tolerant MR219 pyramided lines with a yield advantage of more than 1500 kg ha(-1). Differential yield advantages of different combinations of the qDTYs indicate a differential synergistic relationship among qDTYs. This is the first report on the successful effect of qDTYs in increasing the yield under drought in genetic backgrounds other than those in which the qDTYs were earlier identified.
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Claims 13
Claim · model-written summary
Grain yield under stress trials was reduced by 79 to 93% relative to non-stress trials.
- Taxon
- rice
Oryza sativat0 - Treatment
- stress trialse1
- Outcome
- grain yielde1
- Direction
- reductionse1
- Value
- 79 to 93%e1
- Comparator
- non-stress trialse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e1“The grain yield reductions in the stress trials compared to non-stress trials ranged from 79 to 93%”
Claim · model-written summary
Days to flowering were delayed under stress trials.
- Taxon
- riceOryza sativat0
- Treatment
- stress trialse2
- Outcome
- days to floweringe2
- Direction
- delaye2
- Comparator
- non-stress trialse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e2“In the stress trials, delay in days to flowering and reduction in plant height were observed”
e1“The grain yield reductions in the stress trials compared to non-stress trials ranged from 79 to 93%”
Claim · model-written summary
Plant height was reduced under stress trials.
- Taxon
- riceOryza sativat0
- Treatment
- stress trialse2
- Outcome
- plant heighte2
- Direction
- reductione2
- Comparator
- non-stress trialse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e2“In the stress trials, delay in days to flowering and reduction in plant height were observed”
e1“The grain yield reductions in the stress trials compared to non-stress trials ranged from 79 to 93%”
Claim · model-written summary
MR219 produced no yield under stress.
- Taxon
- riceOryza sativat0
- Material
- MR219e3
- Outcome
- yielde3
- Qualifier
- did not produce any yield under stresse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e3“In both seasons, MR219 did not produce any yield under stress, however it produced a yield of 5917 kg ha(-1) during the 2013 dry season and 8319 kg ha(-1) during the 2014 dry season under non-stress”
Claim · model-written summary
MR219 yielded 5917 kg/ha in the 2013 dry season under non-stress.
- Taxon
- riceOryza sativat0
- Material
- MR219e3
- Outcome
- yielde3
- Value
- 5917 kg ha(-1)e3
- Qualifier
- under non-stresse3
- Setting
- 2013 dry seasone3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e3“In both seasons, MR219 did not produce any yield under stress, however it produced a yield of 5917 kg ha(-1) during the 2013 dry season and 8319 kg ha(-1) during the 2014 dry season under non-stress”
Claim · model-written summary
MR219 yielded 8319 kg/ha in the 2014 dry season under non-stress.
- Taxon
- riceOryza sativat0
- Material
- MR219e3
- Outcome
- yielde3
- Value
- 8319 kg ha(-1)e3
- Qualifier
- under non-stresse3
- Setting
- 2014 dry seasone3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e3“In both seasons, MR219 did not produce any yield under stress, however it produced a yield of 5917 kg ha(-1) during the 2013 dry season and 8319 kg ha(-1) during the 2014 dry season under non-stress”
Claim · model-written summary
Selected introgressed lines gave a yield advantage of 903 to 2500 kg/ha over MR219 under reproductive-stage drought stress.
- Taxon
- riceOryza sativat0
- Material
- introgressed linese4
- Treatment
- reproductive stage drought stresse4
- Outcome
- yield advantagee4
- Direction
- higherinferrede4
- Value
- 903 to 2500 kg ha(-1)e4
- Comparator
- MR219e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e4“Selected introgressed lines gave a yield advantage of 903 to 2500 kg ha(-1) over MR219 under reproductive stage drought stress and a yield of more than 6900 kg ha(-1) under non-stress during the 2014 dry season”
Claim · model-written summary
Selected introgressed lines yielded more than 6900 kg/ha under non-stress in the 2014 dry season.
- Taxon
- riceOryza sativat0
- Material
- introgressed linese4
- Outcome
- yielde4
- Value
- more than 6900 kg ha(-1)e4
- Qualifier
- under non-stresse4
- Setting
- 2014 dry seasone4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e4“Selected introgressed lines gave a yield advantage of 903 to 2500 kg ha(-1) over MR219 under reproductive stage drought stress and a yield of more than 6900 kg ha(-1) under non-stress during the 2014 dry season”
Claim · model-written summary
Lines carrying qDTY 2.2 gave a higher yield advantage than other single-qDTY lines under reproductive-stage drought in the MR219 background.
- Taxon
- riceOryza sativat0
- Material
- MR219e5
- Treatment
- reproductive stage drought stresse5
- Gene
- qDTY 2.2e5
- Outcome
- yield advantagee5
- Direction
- highere5
- Comparator
- lines with single qDTYe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e5“Among lines with single qDTY, lines carrying qDTY 2.2 provided a higher yield advantage under reproductive stage drought stress in the MR219 background”
Claim · model-written summary
Two-qDTY combinations performed better than lines with three qDTY combinations.
- Taxon
- riceOryza sativat0
- Treatment
- Two-qDTY combinationse6
- Gene
- qDTY 3.1+ qDTY 2.2 and qDTY 3.1+ qDTY 12.1e6
- Outcome
- performede6
- Direction
- bettere6
- Comparator
- lines with three qDTY combinationse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e6“Two-qDTY combinations (qDTY 3.1+ qDTY 2.2 and qDTY 3.1+ qDTY 12.1) performed better than lines with three qDTY combinations, indicating the absence of positive interactions between the three qDTYs”
Claim · model-written summary
The three qDTYs show no positive interactions with one another.
- Taxon
- riceOryza sativat0
- Treatment
- three qDTY combinationse6
- Outcome
- positive interactions between the three qDTYse6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e6“Two-qDTY combinations (qDTY 3.1+ qDTY 2.2 and qDTY 3.1+ qDTY 12.1) performed better than lines with three qDTY combinations, indicating the absence of positive interactions between the three qDTYs”
Claim · model-written summary
The qDTY combinations show a differential synergistic relationship among qDTYs.
- Taxon
- riceOryza sativat0
- Treatment
- different combinations of the qDTYse7
- Outcome
- differential synergistic relationship among qDTYse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e7“Differential yield advantages of different combinations of the qDTYs indicate a differential synergistic relationship among qDTYs”
Claim · model-written summary
The authors developed drought-tolerant MR219 pyramided lines with a yield advantage of more than 1500 kg/ha.
- Taxon
- riceOryza sativat0
- Material
- MR219 pyramided linese0
- Outcome
- yield advantagee0
- Value
- more than 1500 kg ha(-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Malaysian rice cultivar, MR219”
e0“We successfully developed drought-tolerant MR219 pyramided lines with a yield advantage of more than 1500 kg ha(-1)”
The same questions in other papers
drought · yield · Oryza sativa (rice)Positive and negative results
75 papers in the same direction as this paper · 246 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
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