Abstract
Abstract Sorghum [ Sorghum bicolor (L.) Moench] is grown in a wide range of moisture and temperature environments because it is drought and heat resistant and has a relatively high yield potential. Describing the influence of reduced photosynthesis and increased temperature during grain filling on mean kernel weight (KWT) is a prerequisite to understanding the control of productivity in sorghum. Objectives of this study were to determine if decreased available assimilate due to reduced photosynthetic photon flux density (PPFD) during early grain filling reduces KWT by reducing the number of endosperm cells, and to investigate the effect of temperature on KWT and number of starch granules after endosperm cell division is complete. Plants of a single‐seeded hybrid (Hl) and a twin‐seeded hybrid (H2) were grown until heading in a greenhouse. From heading until 10 to 12 d after anthesis, plants were in growth chambers with PPFD of either 300 or 595 μ mol m −2 s −1 . Thereafter, plants were in chambers at 15, 22.5 or 30 °C until maturity. Measurements included seed volume and number of endosperm cells at the end of the PPFD treatments, and number of starch granules and KWT after maturity. Low PPFD early in grain filling did not decrease KWT of either hybrid although it reduced number of endosperm cells of H1 by 47%. The 30 °C treatment reduced KWT by 29% for both hybrids relative to the 22.5 °C treatment. Likewise, the 30 °C temperature reduced number of starch granules at maturity, It appeared that reduced production of starch granules contributed directly to reduced KWT at 30 °C.
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Claims 5
Claim · model-written summary
Low photon flux early in grain filling did not decrease kernel weight in either hybrid.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low PPFD early in grain filling did not decrease KWT of either hybrid”
t0“Sorghum”
Claim · model-written summary
Low photon flux reduced H1 endosperm cell number by 47%.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it reduced number of endosperm cells of H1 by 47%”
t0“Sorghum”
Claim · model-written summary
A 30 °C treatment reduced kernel weight by 29% in both hybrids relative to 22.5 °C.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 30 °C treatment reduced KWT by 29% for both hybrids relative to the 22.5 °C treatment”
t0“Sorghum”
Claim · model-written summary
A 30 °C treatment reduced starch granule numbers at maturity.
- Organ / stage
- maturitye0
- Treatment
- 30 °C temperaturee0
- Outcome
- number of starch granulese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 30 °C temperature reduced number of starch granules at maturity”
t0“Sorghum”
Claim · model-written summary
The authors interpret lower starch granule production as contributing to reduced kernel weight at 30 °C.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced production of starch granules contributed directly to reduced KWT at 30 °C”
t0“Sorghum”
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