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Involvement of abscisic acid and other stress indicators in taro (Colocasia esculenta (L.) Schott) response to drought conditions
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Advisor(s)
Abstract(s)
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 efciency (WUE), and biomass (B). The Δ13C-shoot content showed partially open stomata in all
accessions, and signifcant 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 signifcantly 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.
Description
Keywords
Carbon isotope Chlorophyll content index Drought stress Enzyme-linked immunosorbent assay Oxalic acid Water use efciency . Faculdade de Ciências da Vida
Citation
Gouveia, C. S., Ganança, J. F., Slaski, J. J., Lebot, V., & Carvalho, M. Â. P. (2020). Involvement of abscisic acid and other stress indicators in taro (Colocasia esculenta (L.) Schott) response to drought conditions. Acta Physiologiae Plantarum, 42(12), 1-11. https://doi.org/10.1007/s11738-020-03162-5
Publisher
Springer