TY  - CONF
AU  - Djordjevic, Pavle
AU  - Kostić, Ljiljana
AU  - Bosnić, Predrag
AU  - Maksimović, Vuk
AU  - TODIC, Slavica
AU  - Nikolic, Miroslav
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2511
AB  - Low phosphorus (P) availability is a common constraint for crop productivity in both acid and
calcareous soils due to formation of insoluble P complexes. As far as we are aware, grapevine is not
considered a P-efficient species, whereas P deficiency is rarely reported under the field conditions.
We performed a field experiment under extremely low P conditions (Olsen P < 2 mg kg-1) using
own-designed rhizotron (80 cm depth), installed in 8-y-old vineyard with cultivar Chardonnay,
grafted on 5BB rootstock. The device enables easy access to the new intact roots while preventing
root drying. We collected the exudates from root tips every 2 h (during daytime) at the different
growth stages (i.e. shoots 10 cm, flowering, berries pea-size and veraison). At the same time, both
rhizosphere and bulk soil samples were collected and subjected to the sequential P analyses. The
results of HPLC analyses of the root exudates showed that citrate can be considered as the main
P-mobilizing compound, with clear seasonal and diurnal patterns: the highest anion exudation
rate was recorded at flowering (lower pick) and veraison (higher pick), and at each growth phase
in the morning (10 a.m.) and in the afternoon (4 p.m.), with a rapid depression at 1-3 p.m. Consequently,
the relative share of soluble P fractions (H2O- and NaHCO3-extractable) in the rhizosphere
was very high (20% of the total P fractions), leading to the leaf P concentration of 0.2% DW which
is above the critical P-deficient level (0.15% DW) for grapevine leaves at flowering.
PB  - Serbian Plant Physiology Society, Institute for Biological Research ,,Sinisa Stankovic", University of Belgrade
C3  - Book of Abstracts: 3rd International Conference on Plant Biology [and] 22nd SPPS Meeting, 9-12 June 2018, Belgrade
T1  - Seasonal dynamics of the rhizosphere phosphorus and citrate exudation by grapevine roots in a low P soil: a field experiment
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2511
ER  - 

@conference{
author = "Djordjevic, Pavle and Kostić, Ljiljana and Bosnić, Predrag and Maksimović, Vuk and TODIC, Slavica and Nikolic, Miroslav",
year = "2018",
abstract = "Low phosphorus (P) availability is a common constraint for crop productivity in both acid and
calcareous soils due to formation of insoluble P complexes. As far as we are aware, grapevine is not
considered a P-efficient species, whereas P deficiency is rarely reported under the field conditions.
We performed a field experiment under extremely low P conditions (Olsen P < 2 mg kg-1) using
own-designed rhizotron (80 cm depth), installed in 8-y-old vineyard with cultivar Chardonnay,
grafted on 5BB rootstock. The device enables easy access to the new intact roots while preventing
root drying. We collected the exudates from root tips every 2 h (during daytime) at the different
growth stages (i.e. shoots 10 cm, flowering, berries pea-size and veraison). At the same time, both
rhizosphere and bulk soil samples were collected and subjected to the sequential P analyses. The
results of HPLC analyses of the root exudates showed that citrate can be considered as the main
P-mobilizing compound, with clear seasonal and diurnal patterns: the highest anion exudation
rate was recorded at flowering (lower pick) and veraison (higher pick), and at each growth phase
in the morning (10 a.m.) and in the afternoon (4 p.m.), with a rapid depression at 1-3 p.m. Consequently,
the relative share of soluble P fractions (H2O- and NaHCO3-extractable) in the rhizosphere
was very high (20% of the total P fractions), leading to the leaf P concentration of 0.2% DW which
is above the critical P-deficient level (0.15% DW) for grapevine leaves at flowering.",
publisher = "Serbian Plant Physiology Society, Institute for Biological Research ,,Sinisa Stankovic", University of Belgrade",
journal = "Book of Abstracts: 3rd International Conference on Plant Biology [and] 22nd SPPS Meeting, 9-12 June 2018, Belgrade",
title = "Seasonal dynamics of the rhizosphere phosphorus and citrate exudation by grapevine roots in a low P soil: a field experiment",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2511"
}

Djordjevic, P., Kostić, L., Bosnić, P., Maksimović, V., TODIC, S.,& Nikolic, M.. (2018). Seasonal dynamics of the rhizosphere phosphorus and citrate exudation by grapevine roots in a low P soil: a field experiment. in Book of Abstracts: 3rd International Conference on Plant Biology [and] 22nd SPPS Meeting, 9-12 June 2018, Belgrade
Serbian Plant Physiology Society, Institute for Biological Research ,,Sinisa Stankovic", University of Belgrade..
https://hdl.handle.net/21.15107/rcub_rimsi_2511

Djordjevic P, Kostić L, Bosnić P, Maksimović V, TODIC S, Nikolic M. Seasonal dynamics of the rhizosphere phosphorus and citrate exudation by grapevine roots in a low P soil: a field experiment. in Book of Abstracts: 3rd International Conference on Plant Biology [and] 22nd SPPS Meeting, 9-12 June 2018, Belgrade. 2018;.
https://hdl.handle.net/21.15107/rcub_rimsi_2511 .

Djordjevic, Pavle, Kostić, Ljiljana, Bosnić, Predrag, Maksimović, Vuk, TODIC, Slavica, Nikolic, Miroslav, "Seasonal dynamics of the rhizosphere phosphorus and citrate exudation by grapevine roots in a low P soil: a field experiment" in Book of Abstracts: 3rd International Conference on Plant Biology [and] 22nd SPPS Meeting, 9-12 June 2018, Belgrade (2018),
https://hdl.handle.net/21.15107/rcub_rimsi_2511 .