A humic substances product extracted from biochar reduces Arabidopsis root hair density and length under P-sufficient and P-starvation conditions

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A humic substances product extracted from biochar reduces Arabidopsis root hair density and length under P-sufficient and P-starvation conditions

Year: 

2015

Source of publication :

Plant and Soil

Authors :

Graber, Ellen

;

Koltai, Hinanit

;

Mayzlish-Gati, Einav

;

Shema, Rony

;

Tsechansky, Ludmilla

.

Volume :

395

Co-Authors: 

Graber, E.R., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet Dagan, Israel
Tsechansky, L., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet Dagan, Israel
Mayzlish-Gati, E., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet Dagan, Israel
Shema, R., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet Dagan, Israel
Koltai, H., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet Dagan, Israel

From page: 

21

To page: 

30

(

Total pages: 

10

)

Link :

A humic substances product extracted from biochar reduces Arabidopsis root hair density and length under P-sufficient and P-starvation conditions

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. © 2015, Springer International Publishing Switzerland.