Salicylic acid mitigates the effects of mild drought stress on radish (Raphanus sativus) growth
Juliane Maciel Henschel
A B , Estephanni Fernanda Oliveira Dantas A , Vanessa de Azevedo Soares A , Sabrina Kelly dos Santos B , Letícia Waléria Oliveira dos Santos A , Thiago Jardelino Dias A B and Diego Silva Batista A B *
+ Author Affiliations
- Author Affiliations
A Department of Agriculture, Federal University of Paraíba, Bananeiras, PB 58220-000, Brazil.
B Graduate Program in Agronomy (PPGA), Federal University of Paraíba, Areia, PB 58397-000, Brazil.
Functional Plant Biology 49(9) 822-831 https://doi.org/10.1071/FP22040
Submitted: 19 February 2022 Accepted: 11 May 2022 Published: 14 June 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Water deficit is the most critical factor limiting plant growth and production and salicylic acid (SA) has potential for stress mitigation in plants; therefore, we evaluated the effect of SA on radish (Raphanus sativus L.) growth and ecophysiology under water deficit. Plants were sprayed with SA (100 μM) or water (control), and irrigated at 80% (W80), 60% (W60), 40% (W40), and 20% (W20) of field capacity. The SA treatments and drought stress started 7 days after sowing and lasted until the end of the cycle (30 days after sowing). The morphophysiological analyses showed that radish plants had impaired growth at the lower water supply levels, but the treatment with SA reversed these growth restraints under moderate stress, leading to increases in shoot mass at W40 and storage root mass at W60 and W40. SA treatment also reversed the reduction of storage root volume at W60. The tendency of water deficit to increase FO and reduce FV/FM suggests possible damage to the photosystem II of drought-stressed plants. The parameters of gas exchange and photosynthetic pigments showed maintained photosynthetic efficiency, but total photosynthesis decreased due the lower shoot dry mass. Overall, exogenously applied SA reversed the growth restraints at W60 and W40, which revealed that SA was effective in mitigating the effects of moderate water deficit on biomass accumulation and partitioning in radish plants.
Keywords: drought stress, irrigation levels, phytohormones, Raphanus sativus L, salicylic acid, storage roots, stress tolerance, water deficit.
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