Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply
<p>Exploiting the natural variability of <em>Brachiaria</em> forage germplasm to identify forage grasses adapted to infertile acid soils that contain very low available phosphorus (P) is an important research objective for improving livestock production in the tropics. The objectiv...
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Centro Internacional de Agricultura Tropical
2017-09-01
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doaj-b606ed9508dc467fa7525142899540282020-11-25T00:09:59ZengCentro Internacional de Agricultura TropicalTropical Grasslands-Forrajes Tropicales2346-37752017-09-015310311610.17138/tgft(5)103-116199Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supplyAnna E. Louw-Gaume0Noel Schweizer1Idupulapati M. Rao2Alain J. Gaume3Emmanuel Frossard4Group of Plant Nutrition, Institute of Agricultural Sciences, ETH Zurich, Lindau, SwitzerlandGroup of Plant Nutrition, Institute of Agricultural Sciences, ETH Zurich, Lindau, SwitzerlandCentro Internacional de Agricultura Tropical (CIAT), Cali, Colombia. Presently: Plant Polymer Research Unit, National Center for Agricultural Utilization Research, ARS, USDA, Peoria, IL, USASyngenta Crop Protection, Münchwilen AG, Stein, SwitzerlandGroup of Plant Nutrition, Institute of Agricultural Sciences, ETH Zurich, Lindau, Switzerland<p>Exploiting the natural variability of <em>Brachiaria</em> forage germplasm to identify forage grasses adapted to infertile acid soils that contain very low available phosphorus (P) is an important research objective for improving livestock production in the tropics. The objective of this study was to determine the differences in the release of root biochemical markers, i.e. carboxylates and acid phosphatases (APases), during the development of P deficiency in signalgrass and ruzigrass. We used the hydroxyapatite pouch system in hydroponics to simulate conditions of low P supply in acid soils to test the response of well-adapted signalgrass (<em>Brachiaria decumbens</em> cv. Basilisk, CIAT 606) and less-adapted ruzigrass (<em>B. ruziziensis</em> cv. Kennedy, CIAT 654). We monitored shoot and root growth and other physiological and biochemical components that are important for root functionality at weekly intervals for 3 weeks. We found that monocarboxylate exudation was not associated with the plant’s physiological P status, while exudation of oxalate and secreted-APases increased with declining plant P concentrations in both grasses. Ruzigrass showed higher exudation rates and grew faster than signalgrass, but could not maintain its initial fast growth rate when P concentrations in plant tissue declined to 1.0 mg P/g dry matter. Oxalate was the dominant exuded carboxylate for signalgrass after 21 days of growth and this response might confer some eco-physiological advantages in signalgrass when grown in low-P acid soils.</p>http://tropicalgrasslands.info/index.php/tgft/article/view/323 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anna E. Louw-Gaume Noel Schweizer Idupulapati M. Rao Alain J. Gaume Emmanuel Frossard |
spellingShingle |
Anna E. Louw-Gaume Noel Schweizer Idupulapati M. Rao Alain J. Gaume Emmanuel Frossard Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply Tropical Grasslands-Forrajes Tropicales |
author_facet |
Anna E. Louw-Gaume Noel Schweizer Idupulapati M. Rao Alain J. Gaume Emmanuel Frossard |
author_sort |
Anna E. Louw-Gaume |
title |
Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply |
title_short |
Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply |
title_full |
Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply |
title_fullStr |
Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply |
title_full_unstemmed |
Temporal differences in plant growth and root exudation of two <i>Brachiaria</i> grasses in response to low phosphorus supply |
title_sort |
temporal differences in plant growth and root exudation of two <i>brachiaria</i> grasses in response to low phosphorus supply |
publisher |
Centro Internacional de Agricultura Tropical |
series |
Tropical Grasslands-Forrajes Tropicales |
issn |
2346-3775 |
publishDate |
2017-09-01 |
description |
<p>Exploiting the natural variability of <em>Brachiaria</em> forage germplasm to identify forage grasses adapted to infertile acid soils that contain very low available phosphorus (P) is an important research objective for improving livestock production in the tropics. The objective of this study was to determine the differences in the release of root biochemical markers, i.e. carboxylates and acid phosphatases (APases), during the development of P deficiency in signalgrass and ruzigrass. We used the hydroxyapatite pouch system in hydroponics to simulate conditions of low P supply in acid soils to test the response of well-adapted signalgrass (<em>Brachiaria decumbens</em> cv. Basilisk, CIAT 606) and less-adapted ruzigrass (<em>B. ruziziensis</em> cv. Kennedy, CIAT 654). We monitored shoot and root growth and other physiological and biochemical components that are important for root functionality at weekly intervals for 3 weeks. We found that monocarboxylate exudation was not associated with the plant’s physiological P status, while exudation of oxalate and secreted-APases increased with declining plant P concentrations in both grasses. Ruzigrass showed higher exudation rates and grew faster than signalgrass, but could not maintain its initial fast growth rate when P concentrations in plant tissue declined to 1.0 mg P/g dry matter. Oxalate was the dominant exuded carboxylate for signalgrass after 21 days of growth and this response might confer some eco-physiological advantages in signalgrass when grown in low-P acid soils.</p> |
url |
http://tropicalgrasslands.info/index.php/tgft/article/view/323 |
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