Involvement of abscisic acid and other stress indicators in taro ( Colocasia esculenta (L.) Schott) response to drought
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ORIGINAL ARTICLE
Involvement of abscisic acid and other stress indicators in taro (Colocasia esculenta (L.) Schott) response to drought conditions Carla S. S. Gouveia1 · José F. T. Ganança1 · Jan J. Slaski1,2 · Vincent Lebot3 · Miguel Â. A. Pinheiro de Carvalho1 Received: 28 July 2020 / Revised: 3 September 2020 / Accepted: 3 November 2020 © Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2020
Abstract 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, ABAshoot, 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. Keywords Carbon isotope · Chlorophyll content index · Drought stress · Enzyme-linked immunosorbent assay · Oxalic acid · Water use efficiency Abbreviations ABA Abscisic acid Acc Accession number B Biomass CCI Chlorophyll content index δ13C Carbon isotope composition Δ13C Carbon isotope discrimination ELISA Enzyme-linked immunosorbent assay OA Oxalic acid PCA Principal component analysis Communicated by P. Wojtaszek. * Carla S. S. Gouveia [email protected] 1
ISOPlexis Genebank, Faculty of Life Sciences, University of Madeira, Campus da Penteada, 9020‑105 Funchal, Madeira, Portugal
2
Ecosystems and Plant Sciences, InnoTech Alberta, Hwy 16A and 75 Street, PO Bag 4000, Vegreville, AB, Canada
3
CIRAD-BIOS, PO Box 946, Port‑Vila, Vanuatu
SPC Pacific community WUE Water use efficiency
Introduction Taro (Colocasia esculenta L. Schott) is an important crop for food security in developing countries, as an important source of carbohydrates in the form of starch stored in the corms (Sharma et al. 2016). In 2018, taro production in Africa alone reached almost 7.9 Mt, representing 7
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