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

Autor: Vincent Lebot, Miguel Â. A. Pinheiro de Carvalho, José F. T. Ganança, Jan J. Slaski, Carla S. S. Gouveia
Rok vydání: 2020
Předmět:
0106 biological sciences
0301 basic medicine
Tolérance à la sécheresse
Physiology
adaptation aux changements climatiques
Plant Science
01 natural sciences
F30 - Génétique et amélioration des plantes
Faculdade de Ciências da Vida
chemistry.chemical_compound
Indicateur biologique
Oxalic acid
Abscisic acid
Transpiration
Biomass (ecology)
food and beverages
Plant physiology
Horticulture
ABA
Shoot
Drought stress
Stress dû à la sécheresse
F60 - Physiologie et biochimie végétale
Corm
Biology
03 medical and health sciences
Enzyme-linked immunosorbent assay
Water use efciency
Water-use efficiency
Colocasia esculenta
Carbon isotope
Réponse de la plante
fungi
Chlorophyll content index
Résistance à la sécheresse
030104 developmental biology
chemistry
H50 - Troubles divers des plantes
Agronomy and Crop Science
010606 plant biology & botany
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Acta Physiologiae Plantarum
ISSN: 1861-1664
0137-5881
DOI: 10.1007/s11738-020-03162-5
Popis: 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.
Databáze: OpenAIRE
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