Abstract
The culm (particularly the flag leaf) and the ear are believed to play a major role in providing assimilates for grain filling in wheat. However, the results obtained in the past varied depending on the methodology applied. Three different methodologies were compared that aimed to assess the relative contribution of the culm (photosynthetic organs below the ear) and the ear to grain filling. The first two consisted of applications of photosynthesis inhibition treatments, including the use of the herbicide DCMU and organ shading. The third was a non-intrusive method that compared the carbon isotope composition (δ(13)C) of mature kernels with the δ(13)C of the water-soluble fraction of the peduncle, awns and glumes. Several advanced CIMMYT lines were tested under good agronomic conditions. The δ(13)C approach assigned a higher photosynthetic contribution to the ear than to the culm. However, some methodological considerations should be taken into account when applying the δ(13)C approach, particularly the sampling method used, in order to prevent post-harvest respiration. The shading approach assigned a similar contribution to the ear as to the culm. The DCMU approach assigned a greater role to the culm but herbicide application to the culm affected the ear, thus biasing the final grain weight. Moreover DCMU and shading approaches may cause compensatory effects which overestimated the contribution of unaffected organs. This study may help to develop precise phenotyping tools to identify physiological traits such as ear photosynthesis that could contribute towards increasing grain yield.
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Claims 5
Claim · model-written summary
The delta13C approach assigned a higher photosynthetic contribution to the ear than to the culm.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- δ(13)C approache1
- Outcome
- photosynthetic contribution to the eare1
- Direction
- highere1
- Comparator
- culme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grain filling in wheat”
e1“The δ(13)C approach assigned a higher photosynthetic contribution to the ear than to the culm”
Claim · model-written summary
The shading approach assigned a similar photosynthetic contribution to the ear and to the culm.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- shadinge2
- Outcome
- contribution to the eare2
- Direction
- similare2
- Comparator
- culme2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grain filling in wheat”
e2“The shading approach assigned a similar contribution to the ear as to the culm”
Claim · model-written summary
The DCMU approach assigned a greater role to the culm in grain filling.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- greater role to the culme3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grain filling in wheat”
e3“The DCMU approach assigned a greater role to the culm”
Claim · model-written summary
Herbicide application to the culm affected the ear and biased the final grain weight.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- herbicide application to the culme4
- Outcome
- final grain weighte4
- Direction
- biasinge4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grain filling in wheat”
e4“herbicide application to the culm affected the ear, thus biasing the final grain weight”
Claim · model-written summary
DCMU and shading approaches may cause compensatory effects that overestimate the contribution of unaffected organs.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- DCMU and shading approachese5
- Outcome
- overestimated the contribution of unaffected organse5
- Direction
- overestimatede5
- Comparator
- unaffected organse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grain filling in wheat”
e5“DCMU and shading approaches may cause compensatory effects which overestimated the contribution of unaffected organs”
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herbicide · yield · Triticum aestivum (wheat)Positive and negative results
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