Abstract
Increasing duration of stem elongation by exposure to short photoperiod would result in higher spike dry weight at anthesis, which is positively associated with the number of fertile florets and grains in wheat. However, it is not easy to determine whether photoperiod effects on fertile florets and grains are only mediated by assimilate supply to the growing spike when spike weight variation is attained only with photoperiod treatments. The aim of this study was to determine whether photoperiod effects on number of fertile florets and grains may be direct, that is, not mediated by assimilate supply, by comparing the magnitude of photoperiod effects with those of shading the canopy. Spike dry weight at anthesis was changed through the factorial combination of different photoperiod (natural and 6 h extended photoperiod) and shading (un-shaded and 67 ± 3% shaded) treatments during stem elongation of Buck Manantial, a cultivar known for its photoperiod sensitivity in this phase. Both treatments modified spike dry weight at anthesis and the number of fertile florets and grains, independently. When duration of stem elongation was lengthened by exposure to natural photoperiod and when incident radiation was high, spike dry weight at anthesis increased by 33% (NP+0 v. NP+6) and 27% (un-shaded v. shaded), respectively. The number of fertile florets increased similarly to spike dry weight (34% NP+0 v. NP+6 and 28% un-shaded v. shaded) resulting in higher number of grains. Most photoperiod effects on the number of fertile florets and, consequently, on the number of grains, were mediated by assimilate supply to the growing spike as the same relationship between the number of fertile florets and spike dry weight at anthesis was observed for photoperiod and shading treatments (R2 = 0.99, P<0.05).
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Claims 7
Claim · model-written summary
Natural photoperiod (NP+0) increased spike dry weight at anthesis by 33% compared with NP+6.
- Taxon
- wheat
Triticum aestivume1 - Material
- Buck Manantiale2
- Organ / stage
- spikee3
- Treatment
- natural photoperiode3
- Outcome
- spike dry weight at anthesise3
- Direction
- increasede3
- Value
- 33%e3
- Comparator
- NP+6e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e2“Buck Manantial, a cultivar known for its photoperiod sensitivity in this phase”
e3“When duration of stem elongation was lengthened by exposure to natural photoperiod and when incident radiation was high, spike dry weight at anthesis increased by 33% (NP+0 v. NP+6) and 27% (un-shaded v. shaded), respectively”
Claim · model-written summary
Un-shaded canopy increased spike dry weight at anthesis by 27% compared with shaded canopy.
- Taxon
- wheatTriticum aestivume1
- Material
- Buck Manantiale2
- Organ / stage
- spikee3
- Treatment
- un-shadede3
- Outcome
- spike dry weight at anthesise3
- Direction
- increasede3
- Value
- 27%e3
- Comparator
- shadede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e2“Buck Manantial, a cultivar known for its photoperiod sensitivity in this phase”
e3“When duration of stem elongation was lengthened by exposure to natural photoperiod and when incident radiation was high, spike dry weight at anthesis increased by 33% (NP+0 v. NP+6) and 27% (un-shaded v. shaded), respectively”
Claim · model-written summary
Natural photoperiod (NP+0) increased fertile floret number by 34% compared with NP+6.
- Taxon
- wheatTriticum aestivume1
- Treatment
- NP+0e4
- Outcome
- number of fertile floretse4
- Direction
- increasede4
- Value
- 34%e4
- Comparator
- NP+6e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e4“The number of fertile florets increased similarly to spike dry weight (34% NP+0 v. NP+6 and 28% un-shaded v. shaded) resulting in higher number of grains”
Claim · model-written summary
Un-shaded canopy increased fertile floret number by 28% compared with shaded canopy.
- Taxon
- wheatTriticum aestivume1
- Treatment
- un-shadede4
- Outcome
- number of fertile floretse4
- Direction
- increasede4
- Value
- 28%e4
- Comparator
- shadede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e4“The number of fertile florets increased similarly to spike dry weight (34% NP+0 v. NP+6 and 28% un-shaded v. shaded) resulting in higher number of grains”
Claim · model-written summary
Fertile floret number was closely related to spike dry weight at anthesis across photoperiod and shading treatments.
- Taxon
- wheatTriticum aestivume1
- Treatment
- photoperiod and shading treatmentse6
- Outcome
- relationship between the number of fertile florets and spike dry weight at anthesise6
- Value
- R2 = 0.99e6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e6“the same relationship between the number of fertile florets and spike dry weight at anthesis was observed for photoperiod and shading treatments (R2 = 0.99, P<0.05)”
Claim · model-written summary
Most photoperiod effects on fertile floret and grain number were mediated by assimilate supply to the spike (author interpretation).
- Taxon
- wheatTriticum aestivume1
- Outcome
- photoperiod effects on the number of fertile floretse5
- Qualifier
- mediated by assimilate supply to the growing spikee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e5“Most photoperiod effects on the number of fertile florets and, consequently, on the number of grains, were mediated by assimilate supply to the growing spike”
Claim · model-written summary
Photoperiod and shading treatments resulted in higher grain number.
- Taxon
- wheatTriticum aestivume1
- Treatment
- photoperiod and shading treatmentse6
- Outcome
- number of grainse4
- Direction
- highere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the number of fertile florets and grains in wheat”
e4“The number of fertile florets increased similarly to spike dry weight (34% NP+0 v. NP+6 and 28% un-shaded v. shaded) resulting in higher number of grains”
e6“the same relationship between the number of fertile florets and spike dry weight at anthesis was observed for photoperiod and shading treatments (R2 = 0.99, P<0.05)”
The same questions in other papers
light · yield · Triticum aestivum (wheat)Positive and negative results
32 papers in the same direction as this paper · 35 in the opposite direction
- no effect
- positive
- negative
64 papers more in this group
See all 68 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.