Abstract
Double-low rapeseed cultivars that produce no erucic acid and have only a small amount of glucosinolates are widely used. However, the roots in mature plant residue and leaves and roots of these seedlings still contain a large amount of biologically active glucosinolates, and it is important to clarify the effect of rapeseed cultivation on the subsequent crops. We analyzed the biological activities of the tissues of double-low cultivar at harvest. The laboratory bioassays revealed that the seeds and roots of mature rapeseed plants contained some autotoxic components that were volatile and water-soluble. We also analyzed the effects of root exudates from growing rapeseed plants on rapeseed germination and growth using the stair-step method and found that the root exudates were autotoxic. In the field, we investigated the allelopathic effects of rapeseed plants on the growth, yield, and quality of the subsequent sunflower plant in the same field. The growth, yield and thousand kernel weight of sunflower were reduced by the preceding cultivation of rapeseed. There were many spontaneously germinated juvenile rapeseed plants in the sunflower field preceded by rapeseed cultivation. Analysis of the plant and soil nitrogen (N) indicated that the growth reduction of sunflower was not caused by the competition for N with the spontaneously germinated juvenile rapeseed plants. The main factors responsible for poor sunflower growth under field after the cultivation of rapeseed were suggested to be some non-volatile, water-soluble components produced by the roots of the spontaneously germinated juvenile rapeseed.
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Claims 7
Claim · model-written summary
Mature rapeseed seeds contained volatile and water-soluble autotoxic components.
Verbatim
e0“the seeds and roots of mature rapeseed plants contained some autotoxic components that were volatile and water-soluble”
Claim · model-written summary
Mature rapeseed roots contained volatile and water-soluble autotoxic components.
Verbatim
e0“the seeds and roots of mature rapeseed plants contained some autotoxic components that were volatile and water-soluble”
Claim · model-written summary
Root exudates from growing rapeseed were autotoxic to rapeseed germination and growth.
Not reportedComparator
Verbatim
e0“the effects of root exudates from growing rapeseed plants on rapeseed germination and growth using the stair-step method and found that the root exudates were autotoxic”
Claim · model-written summary
Preceding rapeseed cultivation reduced subsequent sunflower growth, yield and thousand kernel weight.
- Taxon
- sunflower
Helianthus annuuse0 - Treatment
- preceding cultivation of rapeseede0
- Interactor
- rapeseede0weed
- Outcome
- growth, yield and thousand kernel weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth, yield and thousand kernel weight of sunflower were reduced by the preceding cultivation of rapeseed.”
Claim · model-written summary
Many juvenile rapeseed plants germinated spontaneously in sunflower fields following rapeseed cultivation.
Verbatim
e0“There were many spontaneously germinated juvenile rapeseed plants in the sunflower field preceded by rapeseed cultivation.”
Claim · model-written summary
Competition for nitrogen with juvenile rapeseed did not explain sunflower growth reduction.
- Taxon
- sunflowerHelianthus annuuse0
- Interactor
- rapeseede0weed
- Outcome
- growth reductione0
- Qualifier
- not caused by the competition for Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth reduction of sunflower was not caused by the competition for N with the spontaneously germinated juvenile rapeseed plants”
Claim · model-written summary
The authors suggested water-soluble root components from juvenile rapeseed as the main cause of poor sunflower growth.
- Taxon
- sunflowerHelianthus annuuse0
- Interactor
- rapeseede0weed
- Outcome
- poor sunflower growthe0
- Qualifier
- non-volatile, water-soluble components produced by the rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The main factors responsible for poor sunflower growth under field after the cultivation of rapeseed were suggested to be some non-volatile, water-soluble components produced by the roots of the spontaneously germinated juvenile rapeseed.”
The same questions in other papers
allelopathy · growth · Brassica napus (oilseed rape)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.