Abstract
Abstract Water stress during seed filling could reduce soybean [ Glycine max (L.) Merr.] yield by accelerating leaf senescence and shortening the seed filling period. Greenhouse experiments were conducted to (i) evaluate the effect of water stress during seed fill on leaf senescence and (ii) determine the potential role of redistributed C and N in moderating the effect of water stress during seed fill. Soybean plants (‘McCall’, Exp. 1; ‘Elgin 87’, Exp. 2) were grown in soil‐filled pots. At the beginning of Growth Stage R6, two levels of water stress were imposed until maturity: daily waterings of 60% (moderate stress) and 30% (severe stress) of the water required to bring well‐watered pots to field capacity. Moisture stress reduced yield by reducing seed size (8–20%) in Exp. 1 and seed number (18%) and seed size (14–32%) in Exp. 2. Moisture stress accelerated leaf senescence, as shown by more rapid declines in leaf chlorophyll and N, and shortened the seed filling period in both experiments. In Exp. 2, a 50% depodding treatment was applied at the beginning of Growth Stage R6. Depodding delayed senescence and physiological maturity. Moisture stress accelerated leaf senescence and reduced seed size on the depodded plants, but the effect was less than on the nondepodded plants. Our results demonstrate that moisture stress during seed filling reduces yield by accelerating senescence and shortening the seed filling period. Increasing the source‐sink ratio may reduce the effect of moisture stress on seed size.
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Claims 9
Claim · model-written summary
Moisture stress reduced yield through smaller seed size in experiment 1.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Moisture stresse0
- Outcome
- seed sizee0
- Direction
- reducinge0
- Value
- 8–20%e0
- Qualifier
- Exp. 1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moisture stress reduced yield by reducing seed size (8–20%) in Exp. 1”
t0“Soybean”
Claim · model-written summary
Moisture stress reduced seed number by 18% in experiment 2.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Moisture stresse1
- Outcome
- seed numbere0
- Direction
- reducinge1
- Value
- 18%e0
- Qualifier
- Exp. 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed number (18%) and seed size (14–32%) in Exp. 2”
e1“Moisture stress reduced yield by reducing seed size (8–20%) in Exp. 1 and seed number (18%)”
t0“Soybean”
Claim · model-written summary
Moisture stress reduced seed size by 14–32% in experiment 2.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Moisture stresse1
- Outcome
- seed sizee0
- Direction
- reducinge1
- Value
- 14–32%e0
- Qualifier
- Exp. 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed size (14–32%) in Exp. 2”
e1“Moisture stress reduced yield by reducing seed size (8–20%) in Exp. 1 and seed number (18%) and seed size (14–32%)”
t0“Soybean”
Claim · model-written summary
Moisture stress accelerated leaf senescence, reflected in faster chlorophyll and N decline.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- leafe0
- Treatment
- Moisture stresse0
- Outcome
- leaf chlorophyll and Ne0
- Direction
- more rapid declinese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moisture stress accelerated leaf senescence, as shown by more rapid declines in leaf chlorophyll and N”
t0“Soybean”
Claim · model-written summary
Moisture stress shortened the seed filling period in both experiments.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Moisture stresse1
- Outcome
- seed filling periode0
- Direction
- shortenede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shortened the seed filling period in both experiments”
e1“Moisture stress accelerated leaf senescence, as shown by more rapid declines in leaf chlorophyll and N, and shortened the seed filling period in both experiments”
t0“Soybean”
Claim · model-written summary
Depodding delayed senescence and physiological maturity.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Depoddinge0
- Outcome
- senescence and physiological maturitye0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Depodding delayed senescence and physiological maturity”
t0“Soybean”
Claim · model-written summary
Water stress accelerated senescence on depodded plants, less than on nondepodded plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Moisture stresse0
- Outcome
- leaf senescencee0
- Direction
- acceleratede0
- Comparator
- nondepodded plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moisture stress accelerated leaf senescence and reduced seed size on the depodded plants, but the effect was less than on the nondepodded plants”
t0“Soybean”
Claim · model-written summary
Water stress reduced seed size on depodded plants less than on nondepodded plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Moisture stresse0
- Outcome
- seed sizee0
- Direction
- reducede0
- Comparator
- nondepodded plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moisture stress accelerated leaf senescence and reduced seed size on the depodded plants, but the effect was less than on the nondepodded plants”
t0“Soybean”
Claim · model-written summary
Increasing source-sink ratio may reduce water-stress effects on seed size.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- Increasing the source‐sink ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the source‐sink ratio may reduce the effect of moisture stress on seed size”
t0“Soybean”
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