Abstract
Two‐line hybrid rice ( Oryza sativa L.) is a hybrid from a thermosensitive genetic male sterile line and its corresponding restoring line. This hybrid rice shows strong heterosis but a slow grain‐filling rate, as a result of unfavorably delayed senescence. This study investigated the possibility that a moderate water deficit imposed during grain filling may enhance plant senescence, and therefore facilitate the remobilization of reserve C to the grains and improve grain filling. Two two‐line indica hybrids were grown in both the pot and field. Three levels of soil water potential, well watered (WW), moderate water deficit (MD), and severe water deficit (SD), were imposed from 9 d after anthesis to maturity in both pot and field experiments. Results showed that Chlorophyll content and photosynthetic rate of the flag leaves declined more quickly as plants approached maturity for MD and SD plants than for WW plants, indicating the water deficits enhanced senescence. The remobilized C reserve and reallocation of pre‐fixed 14 C from stems to grains increased by 1.5‐ to 2‐fold and 55 to 67%, respectively, for water deficit plants, when compared with WW plants. The water deficit treatments shortened the grain‐filling by 5 to 17 d and increased the grain‐filling rate by 0.09 to 0.27 mg d −1 grain −1 The grain yield of MD plants in both experiments was increased by 8.2 to 10% but that of SD plants in the pot was reduced. We conclude that if water deficit is properly controlled during the grain filling, whole‐plant senescence is enhanced. The enhanced senescence can facilitate remobilization of C reserves, accelerate grain filling, and increase grain yield in the two‐line hybrid rice.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Moderate and severe deficit accelerated chlorophyll decline in flag leaves.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- flag leavese0
- Treatment
- MD and SDe0
- Outcome
- Chlorophyll contente0
- Direction
- declined more quicklye0
- Comparator
- WW plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content and photosynthetic rate of the flag leaves declined more quickly as plants approached maturity for MD and SD plants than for WW plants”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Moderate and severe deficit accelerated photosynthetic decline in flag leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- flag leavese0
- Treatment
- MD and SDe0
- Outcome
- photosynthetic ratee0
- Direction
- declined more quicklye0
- Comparator
- WW plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content and photosynthetic rate of the flag leaves declined more quickly as plants approached maturity for MD and SD plants than for WW plants”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Water deficit increased remobilized carbon reserve 1.5‐ to 2‐fold.
- Taxon
- riceOryza sativat0
- Treatment
- water deficite0
- Outcome
- remobilized C reservee0
- Direction
- increasede0
- Value
- 1.5‐ to 2‐folde0
- Comparator
- WW plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The remobilized C reserve and reallocation of pre‐fixed 14 C from stems to grains increased by 1.5‐ to 2‐fold and 55 to 67%, respectively, for water deficit plants, when compared with WW plants.”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Water deficit increased carbon reallocation from stems to grains by 55 to 67%.
- Taxon
- riceOryza sativat0
- Treatment
- water deficite0
- Outcome
- reallocation of pre‐fixed 14 C from stems to grainse0
- Direction
- increasede0
- Value
- 55 to 67%e0
- Comparator
- WW plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The remobilized C reserve and reallocation of pre‐fixed 14 C from stems to grains increased by 1.5‐ to 2‐fold and 55 to 67%, respectively, for water deficit plants, when compared with WW plants.”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Water deficit shortened grain filling by 5 to 17 d.
- Taxon
- riceOryza sativat0
- Treatment
- water deficit treatmentse0
- Outcome
- grain‐fillinge0
- Direction
- shortenede0
- Value
- 5 to 17 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water deficit treatments shortened the grain‐filling by 5 to 17 d”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Water deficit increased grain-filling rate by 0.09 to 0.27 mg d −1 grain −1.
- Taxon
- riceOryza sativat0
- Treatment
- Water Deficitst0
- Outcome
- grain‐filling ratee0
- Direction
- increasede0
- Value
- 0.09 to 0.27 mg d −1 grain −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the grain‐filling rate by 0.09 to 0.27 mg d −1 grain −1”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Moderate deficit increased grain yield by 8.2 to 10% in both experiments.
- Taxon
- riceOryza sativat0
- Treatment
- MDe0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 8.2 to 10%e0
- Qualifier
- both experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The grain yield of MD plants in both experiments was increased by 8.2 to 10%”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
Severe deficit reduced pot grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of SD plants in the pot was reduced.”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
Claim · model-written summary
The authors conclude that controlled water deficit enhances whole-plant senescence, carbon remobilization, grain filling and yield.
- Taxon
- riceOryza sativat0
- Treatment
- water deficite0
- Outcome
- grain yielde0
- Qualifier
- whole‐plant senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if water deficit is properly controlled during the grain filling, whole‐plant senescence is enhanced. The enhanced senescence can facilitate remobilization of C reserves, accelerate grain filling, and increase grain yield”
t0“Postanthesis Water Deficits Enhance Grain Filling in Two‐Line Hybrid Rice”
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
- negative
321 papers more in this group
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.