Abstract
ABSTRACT Soybean [ Glycine max (L.) Merr.] is often exposed to high daytime and nighttime temperatures during critical growth stages. Threshold mean daily temperature for photosynthesis, respiration, and reproductive process in soybean is ≥26°C. In future, the magnitude of increase in nighttime temperatures will be greater than in daytime temperatures. The objectives were to determine effects of high daytime or nighttime temperatures on (i) leaf photosynthetic and respiration rates; (ii) pollen germination, pod‐set, and seed weight; and (iii) pollen phospholipids profile. Soybean plants were exposed to high daytime temperature (39/20°C), high nighttime temperatures (30/23°C, 30/26°C, and 30/29°C), or optimum temperature (30/20°C) for 10 d at flowering stage. High daytime temperature (39/20°C) or nighttime temperatures (30/29°C) increased leaf respiration rates and decreased leaf chlorophyll content, photosynthetic rate, photochemical quenching, and electron transport rate compared to optimum temperature. Likewise, high temperature decreased pollen viability and germination. Lower pollen germination at high temperature may be due to decreased levels of saturated phospholipids and phosphatidic acid in pollen grains compared with optimum temperature. Pod‐set and seed weight were decreased by high daytime or nighttime temperature. In conclusion, high daytime (39/20°C) or nighttime (30/29°C) temperature decreased leaf photosynthetic rate and pollen germination, leading to lower pod‐set and seed weight.
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Claims 7
Claim · model-written summary
High daytime or nighttime temperature increased soybean leaf respiration relative to optimum temperature.
- Taxon
- Soybean
Glycine maxe1 - Treatment
- High daytime temperature (39/20°C) or nighttime temperatures (30/29°C)e0
- Outcome
- leaf respiration ratese0
- Direction
- increasede0
- Comparator
- optimum temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High daytime temperature (39/20°C) or nighttime temperatures (30/29°C) increased leaf respiration rates and decreased leaf chlorophyll content, photosynthetic rate, photochemical quenching, and electron transport rate compared to optimum temperature”
e1“Soybean plants”
Claim · model-written summary
High daytime or nighttime temperature decreased leaf chlorophyll content, photosynthetic rate and photochemical quenching.
- Taxon
- SoybeanGlycine maxe1
- Treatment
- High daytime temperature (39/20°C) or nighttime temperatures (30/29°C)e0
- Outcome
- leaf chlorophyll content, photosynthetic rate, photochemical quenchinge0
- Direction
- decreasede0
- Comparator
- optimum temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High daytime temperature (39/20°C) or nighttime temperatures (30/29°C) increased leaf respiration rates and decreased leaf chlorophyll content, photosynthetic rate, photochemical quenching, and electron transport rate compared to optimum temperature”
e1“Soybean plants”
Claim · model-written summary
High daytime or nighttime temperature decreased leaf electron transport rate.
- Taxon
- SoybeanGlycine maxe1
- Treatment
- High daytime temperature (39/20°C) or nighttime temperatures (30/29°C)e0
- Outcome
- electron transport ratee0
- Direction
- decreasede0
- Comparator
- optimum temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High daytime temperature (39/20°C) or nighttime temperatures (30/29°C) increased leaf respiration rates and decreased leaf chlorophyll content, photosynthetic rate, photochemical quenching, and electron transport rate compared to optimum temperature”
e1“Soybean plants”
Claim · model-written summary
High temperature decreased soybean pollen viability and germination.
- Taxon
- SoybeanGlycine maxe1
- Organ / stage
- pollene0
- Treatment
- high temperaturee0
- Outcome
- pollen viability and germinatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature decreased pollen viability and germination”
e1“Soybean plants”
Claim · model-written summary
High temperature reduced saturated phospholipid and phosphatidic acid levels in pollen relative to optimum temperature.
- Taxon
- SoybeanGlycine maxe2
- Treatment
- high temperaturee1
- Outcome
- levels of saturated phospholipids and phosphatidic acid in pollen grainse0
- Direction
- decreasede0
- Comparator
- optimum temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased levels of saturated phospholipids and phosphatidic acid in pollen grains compared with optimum temperature”
e1“at high temperature”
e2“Soybean plants”
Claim · model-written summary
Decreased saturated phospholipids and phosphatidic acid may explain lower pollen germination at high temperature.
- Taxon
- SoybeanGlycine maxe1
- Outcome
- Lower pollen germinatione0
- Qualifier
- decreased levels of saturated phospholipids and phosphatidic acid in pollen grainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower pollen germination at high temperature may be due to decreased levels of saturated phospholipids and phosphatidic acid in pollen grains compared with optimum temperature”
e1“Soybean plants”
Claim · model-written summary
High daytime or nighttime temperature decreased soybean pod set and seed weight.
- Taxon
- SoybeanGlycine maxe1
- Treatment
- high daytime or nighttime temperaturee0
- Outcome
- Pod‐set and seed weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod‐set and seed weight were decreased by high daytime or nighttime temperature”
e1“Soybean plants”
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See all 22 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.