Abstract
The influence of boron on the growth of and lignin formation in stem callus and root cultures of sunflower, Helianthus annuus L., was investigated. A significantly lower rate of growth in both types of tissue was observed to result from a deficiency of boron in the nutrient medium. This effect was noted during the third 30-day transfer period with callus cultures, while it appeared in the second 10-day transfer period with roots. Boron deficiency resulted in a lower degree of lignification of both callus and roots. The total lignin content of boron-deficient tissues was significantly less than that of those receiving adequate boron. Although boron deficiency resulted in changes in catalase activity in the tissues, the trends were not consistent. The peroxidase activity of boron-deficient tissues was consistently and significantly lower than that of tissues receiving boron in the nutrient medium. It is proposed that the lower peroxidase activity may account in part for the lower degree of lignification of boron-deficient tissues.
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Claims 7
Claim · model-written summary
Boron deficiency in the nutrient medium significantly lowered the growth rate of both sunflower callus and root cultures.
- Taxon
- Sunflower
Helianthus annuust0 - Organ / stage
- both types of tissuee0
- Treatment
- deficiency of boron in the nutrient mediume0
- Outcome
- rate of growthe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“A significantly lower rate of growth in both types of tissue was observed to result from a deficiency of boron in the nutrient medium”
Claim · model-written summary
The growth effect was noted during the third 30-day transfer period with callus cultures and the second 10-day transfer period with roots.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- This effect was noted during the third 30-day transfer period with callus culturese0
- Qualifier
- it appeared in the second 10-day transfer period with rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“This effect was noted during the third 30-day transfer period with callus cultures, while it appeared in the second 10-day transfer period with roots”
Claim · model-written summary
Boron deficiency resulted in a lower degree of lignification of both callus and roots.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- callus and rootse0
- Treatment
- Boron deficiencye0
- Outcome
- degree of lignificatione0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“Boron deficiency resulted in a lower degree of lignification of both callus and roots”
Claim · model-written summary
Total lignin content of boron-deficient tissues was significantly less than that of tissues receiving adequate boron.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- boron-deficient tissuese0
- Outcome
- total lignin contente0
- Direction
- lesse0
- Comparator
- those receiving adequate borone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“The total lignin content of boron-deficient tissues was significantly less than that of those receiving adequate boron”
Claim · model-written summary
Boron deficiency changed catalase activity in the tissues, but the trends were not consistent.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- boron deficiencye0
- Outcome
- catalase activitye0
- Qualifier
- the trends were not consistente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“Although boron deficiency resulted in changes in catalase activity in the tissues, the trends were not consistent”
Claim · model-written summary
Peroxidase activity of boron-deficient tissues was consistently and significantly lower than that of tissues receiving boron.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- boron-deficient tissuese0
- Outcome
- peroxidase activitye0
- Direction
- lowere0
- Comparator
- tissues receiving boron in the nutrient mediume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“The peroxidase activity of boron-deficient tissues was consistently and significantly lower than that of tissues receiving boron in the nutrient medium”
Claim · model-written summary
The authors propose that the lower peroxidase activity may account in part for the lower lignification of boron-deficient tissues.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- boron-deficient tissuese0
- Gene
- peroxidasee0
- Outcome
- lower degree of lignificatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e0“It is proposed that the lower peroxidase activity may account in part for the lower degree of lignification of boron-deficient tissues”
The same questions in other papers
boron atom · growth · Helianthus annuus (common sunflower)Results differ
32 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- no effect
35 papers more in this group
See all 39 papers →in vitro · growth · Helianthus annuus (common sunflower)Positive and negative results
13 papers in the same direction as this paper · 22 in the opposite direction
- positive
- positive
- positive
32 papers more in this group
See all 36 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.