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- Title
A humic substances product extracted from biochar reduces Arabidopsis root hair density and length under P-sufficient and P-starvation conditions.
- Authors
Graber, E.; Tsechansky, L.; Mayzlish-Gati, E.; Shema, R.; Koltai, H.
- Abstract
Background and aims: Biochar additions may have positive impacts on phosphorus (P) availability to plants and cause down-regulation of genes associated with P starvation. Various alkaline-extracted humic substances products (HSP) also induce partial relief in plants from P starvation and, moreover, cause an increase in total cell phosphate, ATP and glucose-6-phosphate levels. As many biochars contain substances similar in structure and functioning to HSP, our goal was to examine if such products extracted from biochar (B-HSP) could affect plant responses to initial P concentration (Pi) under Pi sufficient and starvation conditions. Methods: We examined the impact of B-HSP in the growing media of Arabidopsis seedlings on root hair development (length and density) in sterile systems, and evaluated whether nutrient complexation with B-HSP could account for observed differences. Results: Root hair length was significantly lower in B-HSP amended Pi-sufficient growing media, and root hair density was significantly lower in both B-HSP amended Pi sufficient and starvation regimes as compared with non-amended treatments. The differences did not result from either primary (P source) or secondary (increased P availability) nutritional effects. Conclusions: B-HSP appears to cause a change in plant perception of P nutrition. This may be another means by which biochar impacts growing plants.
- Subjects
ARABIDOPSIS; BIOCHAR; ROOT hairs (Botany); EFFECT of phosphorus on plants; HUMIC acid content of soils; FULVIC acids; PLANT nutrition; PHYSIOLOGY
- Publication
Plant & Soil, 2015, Vol 395, Issue 1/2, p21
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-015-2524-3