Abstract
Although source–sink relationships in wheat are well studied, the performance of tillers as transient sinks is still unclear, especially under stress conditions. Thus, this work aimed to study the yield relationships of wheat stems in contrasting genotypes as affected by tiller treatment under stress conditions. Two experiments were conducted under greenhouse conditions using BRS Guamirim (high tillering) and BRS Parrudo (low tillering) wheat cultivars. Four tillering treatments were applied on late tillers in the first growing season (2016) and three in the second (2017): (i) free-tillering, (ii) detillering, (iii) physical suppression (only in the first season) and (iv) “spikes removal”. The main stem and the first four emitted tillers were considered as primary tillers. Plants were submitted to drought (2016) and defoliation stress (2017) at preanthesis. Intraspecific competition among tillers increased under drought stress conditions and decreased the plant performance. Nonproductive late tillers do not improve the performance of primary tillers of wheat plants under drought stress, mainly in high-tillering cultivars. The reduction on the thousand grain weight of only ‘Parrudo’ detillered plants indicates that assimilate remobilization from late tillers to primary tillers and main stem seems to be more effective in low-tillering cultivars.
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Claims 5
Claim · model-written summary
Intraspecific competition among wheat tillers increased under drought stress.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- drought stress conditionse0
- Outcome
- Intraspecific competition among tillerse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“assimilates in wheat”
e0“Intraspecific competition among tillers increased under drought stress conditions and decreased the plant performance”
Claim · model-written summary
Intraspecific competition among tillers decreased wheat plant performance.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Intraspecific competition among tillerse0
- Outcome
- the plant performancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“assimilates in wheat”
e0“Intraspecific competition among tillers increased under drought stress conditions and decreased the plant performance”
Claim · model-written summary
Nonproductive late tillers did not improve the performance of primary tillers of wheat plants under drought stress, mainly in high-tillering cultivars.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Nonproductive late tillerse0
- Outcome
- the performance of primary tillerse0
- Direction
- do not improvee0
- Qualifier
- under drought stress, mainly in high-tillering cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“assimilates in wheat”
e0“Nonproductive late tillers do not improve the performance of primary tillers of wheat plants under drought stress, mainly in high-tillering cultivars”
Claim · model-written summary
Detillering reduced thousand grain weight only in the Parrudo cultivar.
- Taxon
- wheatTriticum aestivumt0
- Material
- ‘Parrudo’e0
- Treatment
- detillerede0
- Outcome
- thousand grain weighte0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“assimilates in wheat”
e0“The reduction on the thousand grain weight of only ‘Parrudo’ detillered plants”
Claim · model-written summary
The authors infer that assimilate remobilization from late tillers to primary tillers and main stem seems more effective in low-tillering cultivars.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- assimilate remobilization from late tillers to primary tillers and main steme0
- Qualifier
- more effective in low-tillering cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“assimilates in wheat”
e0“assimilate remobilization from late tillers to primary tillers and main stem seems to be more effective in low-tillering cultivars”
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