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Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses

Drought severely limits forage productivity of C(4) grasses across the tropics. The avoidance of water deficit by increasing the capacity for water uptake or by controlling water loss are common responses in forage C(4) grasses. Napier grass (Pennisetum purpureum) and Brachiaria hybrid cv. Mulato II...

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Autores principales: Cardoso, Juan Andrés, Pineda, Marcela, Jiménez, Juan de la Cruz, Vergara, Manuel Fernando, Rao, Idupulapati M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4595746/
https://www.ncbi.nlm.nih.gov/pubmed/26333827
http://dx.doi.org/10.1093/aobpla/plv107
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author Cardoso, Juan Andrés
Pineda, Marcela
Jiménez, Juan de la Cruz
Vergara, Manuel Fernando
Rao, Idupulapati M.
author_facet Cardoso, Juan Andrés
Pineda, Marcela
Jiménez, Juan de la Cruz
Vergara, Manuel Fernando
Rao, Idupulapati M.
author_sort Cardoso, Juan Andrés
collection PubMed
description Drought severely limits forage productivity of C(4) grasses across the tropics. The avoidance of water deficit by increasing the capacity for water uptake or by controlling water loss are common responses in forage C(4) grasses. Napier grass (Pennisetum purpureum) and Brachiaria hybrid cv. Mulato II are tropical C(4) grasses used for livestock production due to their reputed resistance to drought conditions. However, there is scant information on the mechanisms used by these grasses to overcome water-limited conditions. Therefore, assessments of cumulative transpired water, shoot growth, leaf rolling, leaf gas exchange, dry mass production and a number of morpho-physiological traits were recorded over a period of 21 days under well-watered or drought conditions. Drought reduced shoot dry mass of both grasses by 35 %, yet each grass exhibited contrasting strategies to cope with water shortage. Napier grass transpired most available water by the end of the drought treatment, whereas a significant amount of water was still available for Mulato II. Napier grass maintained carbon assimilation until the soil was fairly dry, whereas Mulato II restricted water loss by early stomatal closure at relatively wet soil conditions. Our results suggest that Napier grass exhibits a ‘water-spending’ behaviour that might be targeted to areas with intermittent drought stress, whereas Mulato II displays a ‘water-saving’ nature that could be directed to areas with longer dry periods.
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spelling pubmed-45957462015-10-09 Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses Cardoso, Juan Andrés Pineda, Marcela Jiménez, Juan de la Cruz Vergara, Manuel Fernando Rao, Idupulapati M. AoB Plants Research Articles Drought severely limits forage productivity of C(4) grasses across the tropics. The avoidance of water deficit by increasing the capacity for water uptake or by controlling water loss are common responses in forage C(4) grasses. Napier grass (Pennisetum purpureum) and Brachiaria hybrid cv. Mulato II are tropical C(4) grasses used for livestock production due to their reputed resistance to drought conditions. However, there is scant information on the mechanisms used by these grasses to overcome water-limited conditions. Therefore, assessments of cumulative transpired water, shoot growth, leaf rolling, leaf gas exchange, dry mass production and a number of morpho-physiological traits were recorded over a period of 21 days under well-watered or drought conditions. Drought reduced shoot dry mass of both grasses by 35 %, yet each grass exhibited contrasting strategies to cope with water shortage. Napier grass transpired most available water by the end of the drought treatment, whereas a significant amount of water was still available for Mulato II. Napier grass maintained carbon assimilation until the soil was fairly dry, whereas Mulato II restricted water loss by early stomatal closure at relatively wet soil conditions. Our results suggest that Napier grass exhibits a ‘water-spending’ behaviour that might be targeted to areas with intermittent drought stress, whereas Mulato II displays a ‘water-saving’ nature that could be directed to areas with longer dry periods. Oxford University Press 2015-09-02 /pmc/articles/PMC4595746/ /pubmed/26333827 http://dx.doi.org/10.1093/aobpla/plv107 Text en Published by Oxford University Press on behalf of the Annals of Botany Company. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Cardoso, Juan Andrés
Pineda, Marcela
Jiménez, Juan de la Cruz
Vergara, Manuel Fernando
Rao, Idupulapati M.
Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title_full Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title_fullStr Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title_full_unstemmed Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title_short Contrasting strategies to cope with drought conditions by two tropical forage C(4) grasses
title_sort contrasting strategies to cope with drought conditions by two tropical forage c(4) grasses
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4595746/
https://www.ncbi.nlm.nih.gov/pubmed/26333827
http://dx.doi.org/10.1093/aobpla/plv107
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