Abstract
Although the sensitivity of crop species to water stress during reproductive growth stages is well documented, the causes of sterility are not understood. The role of decreased panicle exsertion as a causal factor of spikelet sterility in water stressed rice ( Oryza sativa L.) was investigated. Rice cultivar IR36 was grown on a deep silty loam soil under full sprinkler irrigation for 77 days. A line source sprinkler system was then utilized during panicle exsertion and flowering to impose six continuously decreasing irrigation treatments. After the 15‐day treatment period, full sprinkler irrigation was resumed until maturity. Soil moisture extraction and plant water potential were monitored as soil and plant water stress progressed. Panicle exsertion rate was measured on tagged panicles which were later used to assess percent final panicle exsertion and percent sterility. The six irrigation treatments varied in grain yield from 5.0 t ha −1 to about 1 t ha −1 with corresponding increases in spikelet sterility of 16.6 and 74.2%. Panicle exsertion rate decreased linearly with decreasing mean daily leaf water potential. The degree of final panicle exsertion from the flagleaf sheath and percent spikelet sterility both decreased linearly with panicle exsertion rate. All spikelets left unexserted from the flagleaf sheath were sterile. Panicle exsertion rate was slightly confounded by tiller age in that late tillers in the well irrigated treatment had a slower exsertion rate and higher percent sterility than earlier tillers. The early tillers which exserted at rates of 4.5 to 5.5 cm day −1 under well watered conditions decreased to about 3.0 cm day −1 in the stressed plot and accounted for 25 to 30% spikelet sterility in the severely stressed treatment.
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Claims 11
Claim · model-written summary
Panicle exsertion rate decreased linearly as mean daily leaf water potential decreased.
- Taxon
- Oryza sativa L.
Oryza sativae0 - Treatment
- decreasing mean daily leaf water potentiale1
- Outcome
- Panicle exsertion ratee1
- Direction
- decreased linearlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e1“Panicle exsertion rate decreased linearly with decreasing mean daily leaf water potential”
Claim · model-written summary
Final panicle exsertion decreased linearly with panicle exsertion rate.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- panicle exsertion ratee2
- Outcome
- final panicle exsertione2
- Direction
- decreased linearlye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e2“The degree of final panicle exsertion from the flagleaf sheath and percent spikelet sterility both decreased linearly with panicle exsertion rate”
Claim · model-written summary
Percent spikelet sterility decreased linearly with panicle exsertion rate.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- panicle exsertion ratee2
- Outcome
- percent spikelet sterilitye2
- Direction
- decreased linearlye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e2“The degree of final panicle exsertion from the flagleaf sheath and percent spikelet sterility both decreased linearly with panicle exsertion rate”
Claim · model-written summary
All spikelets left unexserted from the flagleaf sheath were sterile.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- spikeletse3
- Outcome
- sterilee3
- Qualifier
- left unexserted from the flagleaf sheathe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e3“All spikelets left unexserted from the flagleaf sheath were sterile”
Claim · model-written summary
The six irrigation treatments varied grain yield from 5.0 t/ha to about 1 t/ha.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- six irrigation treatmentse4
- Outcome
- grain yielde4
- Value
- 5.0 t ha −1 to about 1 t ha −1e4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e4“The six irrigation treatments varied in grain yield from 5.0 t ha −1 to about 1 t ha −1 with corresponding increases in spikelet sterility of 16.6 and 74.2%”
Claim · model-written summary
Irrigation treatments increased spikelet sterility by 16.6%.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- six irrigation treatmentse4
- Outcome
- spikelet sterilitye4
- Direction
- increasese4
- Value
- 16.6e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e4“The six irrigation treatments varied in grain yield from 5.0 t ha −1 to about 1 t ha −1 with corresponding increases in spikelet sterility of 16.6 and 74.2%”
Claim · model-written summary
Irrigation treatments increased spikelet sterility by 74.2%.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- six irrigation treatmentse4
- Outcome
- spikelet sterilitye4
- Direction
- increasese4
- Value
- 74.2%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e4“The six irrigation treatments varied in grain yield from 5.0 t ha −1 to about 1 t ha −1 with corresponding increases in spikelet sterility of 16.6 and 74.2%”
Claim · model-written summary
Under water stress, early tillers exserted panicles at a rate of about 3.0 cm/day, down from 4.5 to 5.5 cm/day under well watered conditions.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- early tillerse5
- Treatment
- stressed plote5
- Outcome
- ratese5
- Direction
- decreasede5
- Value
- 3.0 cm day −1e5
- Comparator
- well watered conditionse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e5“The early tillers which exserted at rates of 4.5 to 5.5 cm day −1 under well watered conditions decreased to about 3.0 cm day −1 in the stressed plot and accounted for 25 to 30% spikelet sterility in the severely stressed treatment”
Claim · model-written summary
Early tillers accounted for 25 to 30% spikelet sterility in the severely stressed treatment.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- early tillerse5
- Treatment
- severely stressed treatmente5
- Outcome
- spikelet sterilitye5
- Value
- 25 to 30%e5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e5“The early tillers which exserted at rates of 4.5 to 5.5 cm day −1 under well watered conditions decreased to about 3.0 cm day −1 in the stressed plot and accounted for 25 to 30% spikelet sterility in the severely stressed treatment”
Claim · model-written summary
Late tillers in the well irrigated treatment had a slower panicle exsertion rate than earlier tillers.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- late tillerse6
- Outcome
- exsertion ratee6
- Direction
- slowere6
- Comparator
- earlier tillerse6
- Setting
- well irrigated treatmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e6“Panicle exsertion rate was slightly confounded by tiller age in that late tillers in the well irrigated treatment had a slower exsertion rate and higher percent sterility than earlier tillers”
Claim · model-written summary
Late tillers in the well irrigated treatment had a higher percent sterility than earlier tillers.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- late tillerse6
- Outcome
- percent sterilitye6
- Direction
- highere6
- Comparator
- earlier tillerse6
- Setting
- well irrigated treatmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed rice ( Oryza sativa L.)”
e6“Panicle exsertion rate was slightly confounded by tiller age in that late tillers in the well irrigated treatment had a slower exsertion rate and higher percent sterility than earlier tillers”
The same questions in other papers
irrigation · yield · Oryza sativa (rice)Positive and negative results
264 papers in the same direction as this paper · 906 in the opposite direction
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