Abstract
This study was conducted to test the hypothesis that photoperiod or its rate of change significantly affects the rate of leaf appearance (RLA) and final number of leaves (FNL) in wheat, as suggested from several time-of-sowing experiments. Two wheat cultivars (Condor and Thatcher) were sown in the field on 2 Sep. 1992 at Melbourne (38°S). Photoperiod was extended artificially to give five treatments up to terminal spikelet initiation (TS) viz. : natural photoperiod (rate of change of photoperiod = 2 min d -1 ), two faster rates of change (8·5 and 13·3 min d -1 ) and two constant photoperiods of 14·0 and 15·5 h. After TS, the two constant photoperiods were extended to 15·0 and 16·5 h, respectively, and treatments were re-randomised, i.e. some plots received different photoperiod regimes before and after TS. The rate of leaf appearance maintained strong linear relationships with thermal time. It was greater for Condor [0·012-0·013 (°C d) -1 ] than for Thatcher [0·011-0·012 (°C d) -1 ] and did not alter during plant development or in response to the change in photoperiod at TS. Rate of leaf appearance on the main culm was not influenced by the rate of change of photoperiod nor by the average photoperiod. Cultivar and photoperiod significantly affected FNL on the main culm. Condor produced more leaves than Thatcher under long but not under short photoperiods. The rate of change of photoperiod did not affect FNL independently of the effect of average photoperiod. Most of the variation in FNL due to photoperiod resulted from differences in duration of leaf initiation. The lack of effects of the photoperiod treatments on RLA contrast with previous reports of its effects on the rate of phasic development from seedling emergence to double ridge. Therefore, the number of visible leaves on the main culm (NL) at double ridge and at TS were not constant. However, NL on the main culm at double ridge was closely correlated with FNL. Copyright 1994, 1999 Academic Press
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Claims 13
Claim · model-written summary
Wheat leaf appearance rate had a strong linear relationship with thermal time.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- thermal timee0
- Outcome
- rate of leaf appearancee0
- Direction
- strong linear relationshipse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of leaf appearance maintained strong linear relationships with thermal time.”
t0“Wheat”
Claim · model-written summary
Condor had a higher leaf appearance rate than Thatcher.
- Taxon
- WheatTriticum aestivumt0
- Material
- Condore0
- Outcome
- greater for Condore0
- Direction
- greatere0
- Value
- 0·012-0·013 (°C d) -1e0
- Qualifier
- 0·011-0·012 (°C d) -1e0
- Comparator
- Thatchere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was greater for Condor [0·012-0·013 (°C d) -1 ] than for Thatcher [0·011-0·012 (°C d) -1 ]”
t0“Wheat”
Claim · model-written summary
Wheat leaf appearance rate did not alter during plant development or after photoperiod change at terminal spikelet initiation.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- Rate of Leaf Appearancet1
- Direction
- did not altere0
- Qualifier
- change in photoperiod at TSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not alter during plant development or in response to the change in photoperiod at TS”
t0“Wheat”
t1“Rate of Leaf Appearance”
Claim · model-written summary
Rate of change of photoperiod did not influence leaf appearance rate on the wheat main culm.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- rate of change of photoperiode0
- Outcome
- Rate of leaf appearance on the main culme0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rate of leaf appearance on the main culm was not influenced by the rate of change of photoperiod”
t0“Wheat”
Claim · model-written summary
Average photoperiod did not influence leaf appearance rate on the wheat main culm.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- average photoperiode0
- Outcome
- Rate of leaf appearance on the main culme0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rate of leaf appearance on the main culm was not influenced by the rate of change of photoperiod nor by the average photoperiod.”
t0“Wheat”
Claim · model-written summary
Cultivar significantly affected final leaf number on the wheat main culm.
- Taxon
- WheatTriticum aestivumt0
- Material
- Cultivare0
- Outcome
- FNL on the main culme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar and photoperiod significantly affected FNL on the main culm.”
t0“Wheat”
Claim · model-written summary
Photoperiod significantly affected final leaf number on the wheat main culm.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- photoperiode0
- Outcome
- FNL on the main culme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar and photoperiod significantly affected FNL on the main culm.”
t0“Wheat”
Claim · model-written summary
Condor produced more leaves than Thatcher under long photoperiods.
- Taxon
- WheatTriticum aestivumt0
- Material
- Condore0
- Outcome
- leavese0
- Direction
- moree0
- Qualifier
- longe0
- Comparator
- Thatchere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Condor produced more leaves than Thatcher under long but not under short photoperiods.”
t0“Wheat”
Claim · model-written summary
Condor and Thatcher did not differ in leaf number under short photoperiods.
- Taxon
- WheatTriticum aestivumt0
- Material
- Condore0
- Outcome
- leavese0
- Direction
- not under short photoperiodse0
- Comparator
- Thatchere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Condor produced more leaves than Thatcher under long but not under short photoperiods.”
t0“Wheat”
Claim · model-written summary
Photoperiod rate of change did not independently affect final leaf number.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- rate of change of photoperiode0
- Outcome
- FNLe0
- Direction
- did not affecte0
- Comparator
- average photoperiode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of change of photoperiod did not affect FNL independently of the effect of average photoperiod.”
t0“Wheat”
Claim · model-written summary
Most photoperiod-related variation in final leaf number arose from differences in leaf initiation duration.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- variation in FNLe0
- Qualifier
- differences in duration of leaf initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of the variation in FNL due to photoperiod resulted from differences in duration of leaf initiation.”
t0“Wheat”
Claim · model-written summary
Visible main-culm leaf number at double ridge and terminal spikelet initiation was not constant.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- double ridge and at TSe0
- Outcome
- number of visible leaves on the main culm (NL)e0
- Direction
- not constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of visible leaves on the main culm (NL) at double ridge and at TS were not constant.”
t0“Wheat”
Claim · model-written summary
Visible main-culm leaf number at double ridge was closely correlated with final leaf number.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- double ridgee0
- Outcome
- NL on the main culme0
- Direction
- closely correlatede0
- Comparator
- FNLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NL on the main culm at double ridge was closely correlated with FNL.”
t0“Wheat”
The same questions in other papers
light · growth · Triticum aestivum (wheat)Positive and negative results
38 papers in the same direction as this paper · 46 reporting no difference from an alternative
- positive
- positive
- positive
81 papers more in this group
See all 85 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.