Abstract
Reproductive stage drought stress (RSDS) is detrimental for rice, which affects its productivity as well as grain quality. In the present study, we introgressed two major quantitative trait loci (QTLs), namely, qDTY2.1 and qDTY3.1, governing RSDS tolerance in a popular high yielding non-aromatic rice cultivar, Pusa 44, through marker-assisted backcross breeding (MABB). Pusa 44 is highly sensitive to RSDS, which restricts its cultivation across drought-prone environments. Foreground selection was carried out using markers, RM520 for qDTY3.1 and RM 521 for qDTY2.1. Background selection was achieved with 97 polymorphic SSR markers in tandem with phenotypic selection to achieve faster recurrent parent genome (RPG) recovery. Three successive backcrosses followed by three selfings aided RPG recoveries of 98.6% to 99.4% among 31 near isogenic lines (NILs). Fourteen NILs were found to be significantly superior in yield and grain quality under RSDS with higher drought tolerance efficiency (DTE) than Pusa 44. Among these, the evaluation of two promising NILs in the multilocational trial during Kharif 2019 showed that they were significantly superior to Pusa 44 under reproductive stage drought stress, while performing on par with Pusa 44 under normal irrigated conditions. These di-QTL pyramided drought-tolerant NILs are in the final stages of testing the All India Coordinated Rice Improvement Project varietal trials for cultivar release. Alternately, the elite drought-tolerant Pusa 44 NILs will serve as an invaluable source of drought tolerance in rice improvement.
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Claims 6
Claim · model-written summary
Fourteen near isogenic lines of Pusa 44 were significantly superior in yield and grain quality to Pusa 44 under reproductive stage drought stress.
- Taxon
- rice
Oryza sativae0 - Material
- NILse1
- Treatment
- Reproductive stage drought stresse0
- Outcome
- yield and grain qualitye1
- Direction
- superiore1
- Comparator
- Pusa 44e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive stage drought stress (RSDS) is detrimental for rice”
e1“Fourteen NILs were found to be significantly superior in yield and grain quality under RSDS with higher drought tolerance efficiency (DTE) than Pusa 44”
Claim · model-written summary
Fourteen near isogenic lines of Pusa 44 had higher drought tolerance efficiency than Pusa 44 under reproductive stage drought stress.
- Taxon
- riceOryza sativae0
- Material
- NILse1
- Treatment
- Reproductive stage drought stresse0
- Outcome
- drought tolerance efficiency (DTE)e1
- Direction
- highere1
- Comparator
- Pusa 44e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive stage drought stress (RSDS) is detrimental for rice”
e1“Fourteen NILs were found to be significantly superior in yield and grain quality under RSDS with higher drought tolerance efficiency (DTE) than Pusa 44”
Claim · model-written summary
Two promising near isogenic lines were significantly superior to Pusa 44 in yield under reproductive stage drought stress in a multilocational trial.
- Taxon
- riceOryza sativae0
- Material
- two promising NILse2
- Treatment
- reproductive stage drought stresse2
- Outcome
- yielde1
- Direction
- superiore2
- Qualifier
- in the multilocational trial during Kharif 2019e2
- Comparator
- Pusa 44e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive stage drought stress (RSDS) is detrimental for rice”
e1“Fourteen NILs were found to be significantly superior in yield and grain quality under RSDS with higher drought tolerance efficiency (DTE) than Pusa 44”
e2“the evaluation of two promising NILs in the multilocational trial during Kharif 2019 showed that they were significantly superior to Pusa 44 under reproductive stage drought stress, while performing on par with Pusa 44 under normal irrigated conditions”
Claim · model-written summary
Two promising near isogenic lines performed on par with Pusa 44 under normal irrigated conditions.
- Taxon
- riceOryza sativae0
- Material
- two promising NILse2
- Treatment
- normal irrigated conditionse2
- Outcome
- performinge2
- Direction
- on pare2
- Comparator
- Pusa 44e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive stage drought stress (RSDS) is detrimental for rice”
e2“the evaluation of two promising NILs in the multilocational trial during Kharif 2019 showed that they were significantly superior to Pusa 44 under reproductive stage drought stress, while performing on par with Pusa 44 under normal irrigated conditions”
Claim · model-written summary
Three successive backcrosses followed by three selfings gave recurrent parent genome recoveries of 98.6% to 99.4% among 31 near isogenic lines of rice.
- Taxon
- riceOryza sativae0
- Material
- 31 near isogenic linese3
- Treatment
- Three successive backcrosses followed by three selfingse3
- Outcome
- RPG recoveriese3
- Value
- 98.6% to 99.4%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive stage drought stress (RSDS) is detrimental for rice”
e3“Three successive backcrosses followed by three selfings aided RPG recoveries of 98.6% to 99.4% among 31 near isogenic lines (NILs)”
Claim · model-written summary
The elite drought-tolerant Pusa 44 near isogenic lines will serve as a source of drought tolerance in rice improvement.
- Taxon
- riceOryza sativae4
- Outcome
- source of drought tolerancee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“will serve as an invaluable source of drought tolerance in rice improvement”
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See all 325 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.