Abstract
Thousand grain weight is one of the components determining wheat grain yield. It represents the average value of individual grain weights which depends on position within the ear and on positon within the spikelet. Our objective was to quantify the influences of individual floret anthesis date, of carpel weight at anthesis and of rate and duration of grain filling, on variation in individual final grain weight. Two bread wheat cultivars were grown in a greenhouse and their ears were sampled from anthesis through to harvest. Each ear was divided into three parts-basal, central and apical-where the two proximal grains were dissected from each of two spikelets. We analysed (i) the flowering time shift within the ear and within the spikelet; and (ii) the growth kinetics during grain filling in relation to position along the ear. For both cultivars, florets located in the central part of the ear were the first to reach anthesis followed by those in the apical part and then the basal part. Within a spikelet, the floret located nearest the rachis flowered first followed by the more distal ones. We found no significant systematic effect of flowering time-shift on final grain weight. Nevertheless, grains in the central part were heavier than the basal ones (9.75% smaller) and than the apical ones (18.25% smaller). These differences were explained mainly by differences in mean grain filling rates. Analysis of growth kinetics enabled an improved explanation of the variability of individual grain weight along the ear.
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Claims 7
Claim · model-written summary
Central wheat florets reached anthesis before apical and basal florets.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- floretse0
- Outcome
- first to reach anthesise0
- Direction
- firste0
- Setting
- central part of the eare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both cultivars, florets located in the central part of the ear were the first to reach anthesis followed by those in the apical part and then the basal part.”
t0“wheat”
Claim · model-written summary
The wheat floret nearest the rachis flowered before distal florets.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- florete0
- Outcome
- flowered firste0
- Direction
- firste0
- Comparator
- more distal onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within a spikelet, the floret located nearest the rachis flowered first followed by the more distal ones.”
t0“wheat”
Claim · model-written summary
Flowering time shift had no significant systematic relation to final wheat grain weight.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- graine0
- Outcome
- final grain weighte0
- Direction
- no significant systematic effecte0
- Comparator
- flowering time-shifte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We found no significant systematic effect of flowering time-shift on final grain weight.”
t0“wheat”
Claim · model-written summary
Central wheat grains were heavier than basal grains, which were 9.75% smaller.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grainse0
- Direction
- heaviere0
- Value
- 9.75%e0
- Comparator
- basal onese0
- Setting
- central parte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nevertheless, grains in the central part were heavier than the basal ones (9.75% smaller) and than the apical ones (18.25% smaller).”
t0“wheat”
Claim · model-written summary
Central wheat grains were heavier than apical grains, which were 18.25% smaller.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grainse0
- Direction
- heaviere0
- Value
- 18.25%e0
- Comparator
- apical onese0
- Setting
- central parte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nevertheless, grains in the central part were heavier than the basal ones (9.75% smaller) and than the apical ones (18.25% smaller).”
t0“wheat”
Claim · model-written summary
Differences in mean grain filling rates mainly explained positional wheat grain-weight differences.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- differencese0
- Qualifier
- differences in mean grain filling ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These differences were explained mainly by differences in mean grain filling rates.”
t0“wheat”
Claim · model-written summary
Growth-kinetics analysis improved explanation of variation in wheat grain weight along the ear.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- improved explanatione0
- Comparator
- variability of individual grain weight along the eare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of growth kinetics enabled an improved explanation of the variability of individual grain weight along the ear.”
t0“wheat”