Abstract
A 2-yr study was conducted to investigate the distribution and retranslocation of boron (B) in field-grown broccoli (Brassica oleracea var. italica). Two broccoli cultivars were grown under various B treatments (no supplemental B, broadcast B, and broadcast B together with one to several liquid applications to the surface of the soil immediately surrounding the stem base) at three Ontario locations where the soils differ markedly in both texture and hot-water-soluble B concentration. Yield responses to B application and external symptoms of B deficiency were not observed. In the absence of supplemental B, the B concentrations of the different plant parts were not correlated with either extractable soil B or plant-organ age (which would have reflected primary translocation via the transpiration stream). Supplemental B at rates of 3.0–4.5 kg ha −1 enhanced the B concentration in xylem sap and eliminated the increasing B gradient up the shoot or induced the formation of a decreasing gradient up the shoot. Floret B concentration and content were rarely affected by the B treatments. The ratios of B concentrations in the sink regions (florets or young leaves) to those in the source leaves suggest that B was effectively retranslocated in plants with a relatively low boron status. Higher concentrations of B in phloem sap than in xylem sap are consistent with B being a phloem-mobile element. Key words: Boron nutrition, Brassica, broccoli, nutrient distribution, retranslocation
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Claims 8
Claim · model-written summary
Boron application produced no observed yield response or deficiency symptoms.
- Taxon
- broccoli
Brassica oleracea var. italicat0 - Treatment
- B applicatione0
- Outcome
- Yield responsese0
- Direction
- not observede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield responses to B application and external symptoms of B deficiency were not observed.”
t0“broccoli”
Claim · model-written summary
Without supplemental boron, plant-part boron concentrations were uncorrelated with extractable soil boron.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- B concentrations of the different plant partse0
- Setting
- extractable soil Be0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of supplemental B, the B concentrations of the different plant parts were not correlated with either extractable soil B or plant-organ age”
t0“broccoli”
Claim · model-written summary
Without supplemental boron, plant-part boron concentrations were uncorrelated with organ age.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Organ / stage
- plant-organ agee0
- Outcome
- B concentrations of the different plant partse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of supplemental B, the B concentrations of the different plant parts were not correlated with either extractable soil B or plant-organ age”
t0“broccoli”
Claim · model-written summary
Supplemental boron enhanced xylem sap boron concentration.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- Supplemental B at rates of 3.0–4.5 kg ha −1e0
- Outcome
- B concentration in xylem sape0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplemental B at rates of 3.0–4.5 kg ha −1 enhanced the B concentration in xylem sap”
t0“broccoli”
Claim · model-written summary
Supplemental boron eliminated the increasing boron gradient or induced a decreasing gradient up the shoot.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- Supplemental B at rates of 3.0–4.5 kg ha −1e0
- Outcome
- B gradient up the shoote0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplemental B at rates of 3.0–4.5 kg ha −1 enhanced the B concentration in xylem sap and eliminated the increasing B gradient up the shoot or induced the formation of a decreasing gradient up the shoot.”
t0“Boron distribution and retranslocation in field-grown broccoli”
Claim · model-written summary
Boron treatment rarely changed floret boron concentration and content.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- B treatmentse0
- Outcome
- Floret B concentration and contente0
- Direction
- rarely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Floret B concentration and content were rarely affected by the B treatments.”
t0“broccoli”
Claim · model-written summary
Sink-to-source boron concentration ratios suggested effective retranslocation at low boron status.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- B was effectively retranslocatede0
- Qualifier
- relatively low boron statuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratios of B concentrations in the sink regions (florets or young leaves) to those in the source leaves suggest that B was effectively retranslocated in plants with a relatively low boron status.”
t0“broccoli”
Claim · model-written summary
Higher phloem than xylem boron concentrations were consistent with phloem mobility.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- concentrations of B in phloem sape0
- Direction
- Highere0
- Comparator
- xylem sape0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of B in phloem sap than in xylem sap are consistent with B being a phloem-mobile element.”
t0“broccoli”
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See all 14 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.