Abstract
Flower initiation (FI) coincided with the commencement of culm elongation under both long (18 h) and normal (10·4–14·4 h) photoperiod in eight spring wheats, including both gibberellic acid-sensitive and -insensitive types, which differed widely in photoperiod sensitivity At FI the apex was significantly (P = 0·05) higher (above ground) in three of the wheats under long, compared with normal photoperiod; with no difference between the remaining five. Differences in response were not related to photoperiod response or gibberellic acid-sensitivity/insensitivity differences between the wheats. Long photoperiod prolonged the phase from terminal spikelet initiation (TSI) to anthesis (A) in all the wheats, except Sunset (with the greatest photoperiod insensitivity), with no clear differences in response between semi-dwarf and standard-height wheats. Respective rates of culm elongation from FI to TSI were lower under normal, compared with long, photoperiod in all varieties. That from TSI to A was unaffected by photoperiod, except in Sunset when it was significantly (P = 0·01) slower under long, compared with normal photoperiod. Rate of culm elongation from FI to TSI across cultivars and photoperiods was inversely related to spikelet number per head (r = −0·53, P = 0·05) but not to rate of spikelet initiation (r = −0·14 n.s.).
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Claims 11
Claim · model-written summary
Flower initiation coincided with the start of culm elongation under both long and normal photoperiod in eight spring wheats.
- Outcome
- Flower initiation (FI) coincided with the commencement of culm elongatione0
- Qualifier
- under both long (18 h) and normal (10·4–14·4 h) photoperiode0
TriticumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flower initiation (FI) coincided with the commencement of culm elongation under both long (18 h) and normal (10·4–14·4 h) photoperiod in eight spring wheats”
Claim · model-written summary
At flower initiation, apices were higher under long than normal photoperiod in three wheats.
- Treatment
- longe0
- Outcome
- the apexe0
- Direction
- highere0
- Qualifier
- in three of the wheatse0
- Comparator
- normal photoperiode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At FI the apex was significantly (P = 0·05) higher (above ground) in three of the wheats under long, compared with normal photoperiod”
Claim · model-written summary
At flower initiation, apex height did not differ by photoperiod in the other five wheats.
- Treatment
- longe0
- Outcome
- the apexe0
- Direction
- no differencee0
- Qualifier
- the remaining fivee0
- Comparator
- normal photoperiode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At FI the apex was significantly (P = 0·05) higher (above ground) in three of the wheats under long, compared with normal photoperiod; with no difference between the remaining five.”
Claim · model-written summary
Differences in apex response were unrelated to photoperiod response or gibberellic acid sensitivity among wheats.
- Material
- gibberellic acid-sensitivity/insensitivity differencese0
- Outcome
- Differences in responsee0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in response were not related to photoperiod response or gibberellic acid-sensitivity/insensitivity differences between the wheats.”
Claim · model-written summary
Long photoperiod prolonged the terminal spikelet initiation to anthesis phase in all wheats except Sunset.
- Treatment
- Long photoperiode0
- Outcome
- the phase from terminal spikelet initiation (TSI) to anthesis (A)e0
- Direction
- prolongede0
- Qualifier
- except Sunsete0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long photoperiod prolonged the phase from terminal spikelet initiation (TSI) to anthesis (A) in all the wheats, except Sunset (with the greatest photoperiod insensitivity)”
Claim · model-written summary
The phase response to long photoperiod did not clearly differ between semi dwarf and standard height wheats.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with no clear differences in response between semi-dwarf and standard-height wheats.”
Claim · model-written summary
Culm elongation from flower initiation to terminal spikelet initiation was slower under normal than long photoperiod in all varieties.
Verbatim
e0“Respective rates of culm elongation from FI to TSI were lower under normal, compared with long, photoperiod in all varieties.”
Claim · model-written summary
Culm elongation from terminal spikelet initiation to anthesis was unaffected by photoperiod except in Sunset.
- Taxon
- Sunsete0
- Treatment
- photoperiode0
- Outcome
- That from TSI to Ae0
- Direction
- unaffectede0
- Qualifier
- except in Sunsete0
Not reportedComparator
Verbatim
e0“That from TSI to A was unaffected by photoperiod, except in Sunset when it was significantly (P = 0·01) slower under long, compared with normal photoperiod.”
Claim · model-written summary
In Sunset, culm elongation from terminal spikelet initiation to anthesis was slower under long than normal photoperiod.
Verbatim
e0“That from TSI to A was unaffected by photoperiod, except in Sunset when it was significantly (P = 0·01) slower under long, compared with normal photoperiod.”
Claim · model-written summary
Across cultivars and photoperiods, culm elongation rate from flower initiation to terminal spikelet initiation was inversely related to spikelet number per head.
Verbatim
e0“Rate of culm elongation from FI to TSI across cultivars and photoperiods was inversely related to spikelet number per head (r = −0·53, P = 0·05)”
Claim · model-written summary
Across cultivars and photoperiods, culm elongation rate from flower initiation to terminal spikelet initiation was not associated with spikelet initiation rate.
Verbatim
e0“Rate of culm elongation from FI to TSI across cultivars and photoperiods was inversely related to spikelet number per head (r = −0·53, P = 0·05) but not to rate of spikelet initiation (r = −0·14 n.s.).”