Abstract
The source and sink relationships determine the amount and distribution of biomass in plants. Field and laboratory experiments were conducted to study the effect of nitrogen rate and spikelet removal on seed yield and germination traits of wheat. The field experiment was conducted employing sink manipulation (no spikelet removal and ½ spikelet removal) and source manipulation (nitrogen rate of 0, 75, and 150 kg ha-1). This study was performed as a factorial experiment in a randomized complete block design with three replications. Seeds obtained from the field experiment were subjected to determine the effect of the sink and source manipulation on seed germination traits in the laboratory experiment. Results showed that most traits under study were not affected by source and sink manipulation. Seed yield and seed weight were not affected by spikelet removal and varying nitrogen applications. Although some of the wheat spikelets have been removed, those plants have been able to maintain the number of seeds per spike and the weight of a single seed. The use of nitrogen at the spike emergence stage did not affect the seed yield of the Pishtaz cultivar. Nitrogen needed for the seeds could be compensated by the re-mobilization of nitrogen from various plant organs such as the stem. Nitrogen application of 150 kg ha-1 with the removal of ½ spikelets improved seed germination (%) and vigor comparing control (no spikelet removal with no nitrogen application). Considering that seed yield and seed weight did not change under the influence of source and sink manipulation, it can be concluded that Pishtaz wheat is more sink-limited than source-limited.
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Claims 6
Claim · model-written summary
Spikelet removal and varying nitrogen applications did not change seed yield or seed weight of wheat.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- spikelet removal and varying nitrogen applicationse2
- Outcome
- Seed yield and seed weighte2
- Direction
- not affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e2“Seed yield and seed weight were not affected by spikelet removal and varying nitrogen applications”
Claim · model-written summary
Nitrogen at the spike emergence stage did not affect seed yield of the Pishtaz wheat cultivar.
- Taxon
- WheatTriticum aestivumt0
- Material
- Pishtaz cultivare3
- Treatment
- The use of nitrogen at the spike emergence stagee3
- Outcome
- seed yielde3
- Direction
- did not affecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e3“The use of nitrogen at the spike emergence stage did not affect the seed yield of the Pishtaz cultivar”
Claim · model-written summary
Nitrogen at 150 kg ha-1 with removal of half the spikelets improved seed germination and vigor compared with control.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Nitrogen application of 150 kg ha-1 with the removal of ½ spikeletse4
- Outcome
- seed germination (%) and vigore4
- Direction
- improvede4
- Comparator
- no spikelet removal with no nitrogen applicatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e4“Nitrogen application of 150 kg ha-1 with the removal of ½ spikelets improved seed germination (%) and vigor comparing control (no spikelet removal with no nitrogen application)”
Claim · model-written summary
Removal of wheat spikelets maintained the number of seeds per spike and the weight of a single seed.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- spikelets have been removede5
- Outcome
- the number of seeds per spike and the weight of a single seede5
- Direction
- maintaine5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e5“Although some of the wheat spikelets have been removed, those plants have been able to maintain the number of seeds per spike and the weight of a single seed”
Claim · model-written summary
Nitrogen needed for seeds of wheat could be compensated by re-mobilization of nitrogen from plant organs such as the stem.
- Taxon
- WheatTriticum aestivumt0
- Compound
- nitrogene6
- Outcome
- Nitrogen needed for the seedse6
- Qualifier
- re-mobilization of nitrogen from various plant organs such as the steme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e6“Nitrogen needed for the seeds could be compensated by the re-mobilization of nitrogen from various plant organs such as the stem”
Claim · model-written summary
Pishtaz wheat is more sink-limited than source-limited.
Verbatim
t0“Alteration of Wheat Source-Sink Relation”
e7“it can be concluded that Pishtaz wheat is more sink-limited than source-limited”
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