Involvement of abscisic acid and other stress indicators in taro (Colocasia esculenta (L.) Schott) response to drought conditions

Gouveia Carla S.S., Ganança José F.T., Slaski Jan, Lebot Vincent, Pinheiro de Carvalho Miguel A.A.. 2020. Involvement of abscisic acid and other stress indicators in taro (Colocasia esculenta (L.) Schott) response to drought conditions. Acta Physiologiae Plantarum, 42:173, 11 p.

Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : Taro (Colocasia esculenta (L.) Schott) is a staple food and represents an important food security role in most tropical regions. It is, unfortunately, susceptible to prolonged drought conditions. Abscisic acid (ABA) is a well-documented stress-induced phytohormone that tolerant crops usually accumulate in leaves to induce stomatal closure, preventing water loss through inhibition of transpiration. Hitherto, exists very scarce information regarding the ABA role in taro response to drought. Here, we determined the ABA content in the shoots and corms of taro subjected to seven months of water scarcity and linked ABA to other drought resilience traits, including carbon isotopic discrimination (Δ13C), oxalic acid (OA), chlorophyll content index (CCI), water use efficiency (WUE), and biomass (B). The Δ13C-shoot content showed partially open stomata in all accessions, and significant correlation with Δ13C-corm, CCI, and WUE. The osmotically active OA-shoot decrease seemed not to interfere with the stomatal aperture. The tolerant accessions subjected to drought stress had higher B-corm, ABA-shoot, Δ13C-shoot, CCI, OA, and WUE. However, the observed under drought conditions increase of ABA in the shoots, and its decrease in the corms were not significantly correlated, nor with other traits, suggesting that ABA was not the main regulator of taro physiological processes under stress. The information gained should be considered in breeding programs to predict taro's response to climate change.

Mots-clés Agrovoc : Colocasia esculenta, réponse de la plante, ABA, stress dû à la sécheresse, résistance à la sécheresse, tolérance à la sécheresse, indicateur biologique, adaptation aux changements climatiques

Mots-clés libres : Taro, Colocasia esculenta, Araceae, Résistance à la sécheresse, Indicateurs

Classification Agris : F60 - Physiologie et biochimie végétale
H50 - Troubles divers des plantes
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Commission, European Regional Development Fund

Auteurs et affiliations

• Gouveia Carla S.S., University of Madeira (PRT) - auteur correspondant
• Ganança José F.T., University of Madeira (PRT)
• Slaski Jan, University of Madeira (PRT)
• Lebot Vincent, CIRAD-BIOS-UMR AGAP (VUT)
• Pinheiro de Carvalho Miguel A.A., University of Madeira (PRT)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597440/)

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