Abstract
Humic substances (HS) play important roles in the biotic-abiotic interactions of the root plant and soil contributing to plant adaptation to external environments. However, their mode of action on plants remains largely unknown. In this study the HS distribution in tissues of wheat seedlings was examined using tritium-labeled humic acid (HA) derived from leonardite (a variety of lignites) and microautoradiography (MAR). Preferential accumulation of labeled products from tritiated HA was found in the roots as compared to the shoots, and endodermis was shown to be the major control point for radial transport of label into vascular system of plant. Tritium was also found in the stele and xylem tissues indicating that labeled products from tritiated HA could be transported to shoot tissues via the transpiration stream. Treatment with HA lead to an increase in the content of polar lipids of photosynthetic membranes. The observed accumulation of labeled HA products in root endodermis and positive impact on lipid synthesis are consistent with prior reported observations on physiological effects of HS on plants such as enhanced growth and development of lateral roots and improvement/repairs of the photosynthetic status of plants under stress conditions.
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Claims 4
Claim · model-written summary
Tritiated humic acid products accumulated preferentially in wheat roots rather than shoots.
- Taxon
- wheat seedlings
Triticum aestivumt0 - Organ / stage
- rootse0
- Outcome
- labeled products from tritiated HAe0
- Direction
- Preferential accumulatione0
- Comparator
- shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preferential accumulation of labeled products from tritiated HA was found in the roots as compared to the shoots,”
t0“Wheat Seedlings”
Claim · model-written summary
The wheat root endodermis was the major control point for radial label transport into vascular tissue.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Organ / stage
- endodermise0
- Outcome
- radial transport of labele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“endodermis was shown to be the major control point for radial transport of label into vascular system of plant.”
t0“Wheat Seedlings”
Claim · model-written summary
Tritium in wheat stele and xylem indicated that labeled humic acid products could reach shoots through transpiration.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Organ / stage
- stele and xylem tissuese0
- Outcome
- transported to shoot tissuese0
- Qualifier
- could be transportede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tritium was also found in the stele and xylem tissues indicating that labeled products from tritiated HA could be transported to shoot tissues via the transpiration stream.”
t0“Wheat Seedlings”
Claim · model-written summary
Humic acid treatment increased polar lipids in wheat photosynthetic membranes.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Organ / stage
- photosynthetic membranese0
- Treatment
- HAe0
- Outcome
- content of polar lipidse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with HA lead to an increase in the content of polar lipids of photosynthetic membranes.”
t0“Wheat Seedlings”
The same questions in other papers
other · molecular: metabolites · Triticum aestivum (wheat)Positive and negative results
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- no effect
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