Growth, Solute Accumulation, and Ion Distribution in Sweet Sorghum under Salt and Drought Stresses in a Brazilian Potiguar Semiarid Area

Author:

de Queiroz Gabriela Carvalho Maia1ORCID,de Medeiros José Francismar1,da Silva Rodrigo Rafael1ORCID,da Silva Morais Francimar Maik1,de Sousa Leonardo Vieira1,de Souza Maria Vanessa Pires2,da Nóbrega Santos Elidayane1,Ferreira Fagner Nogueira1,da Silva Juliana Maria Costa1,Clemente Maria Isabela Batista1ORCID,de Castro Granjeiro Jéssica Christie1,de Araújo Sales Matheus Nathan1,Constante Darcio Cesar1,Nobre Reginaldo Gomes1,da Silva Sá Francisco Vanies1ORCID

Affiliation:

1. Agricultural Sciences Center, Federal Rural University of Semi-Arid, Mossoró 59625-900, RN, Brazil

2. Agricultural Engineering Department, Federal University of Ceará, Fortaleza 60455-760, CE, Brazil

Abstract

Agriculture in semiarid regions commonly face problems because of salt and availability of irrigation water. Considering this, studies on cultures resistant to salt and water stresses involving sweet sorghum are required. Therefore, the aim was to evaluate the growth and other mechanisms of tolerance to salinity and water deficit in BRS 506 sweet sorghum. The experimental design was conducted in Upanema-RN, Brazil, in randomized blocks, where the isolated and interactive effect of 3 salinity levels, expressed as the electrical conductivity of irrigation water (1.5, 3.8, and 6.0 dS m−1), and 3 irrigation depths (55, 83, and 110% of crop evapotranspiration) were evaluated. During the cycle, sorghum adapted to the salinity and deficit irrigation depth, since stem height reduced only −5.5% with increasing salinity and −11.95% with decreasing irrigation depth, and aerial dry mass was affected by interaction only at the end of the cycle. Proline, total amino acids, and total soluble sugars were not differenced by stresses. Additionally, around 68.71% of total Na+ was at roots at the end of the cycle. In summary, sorghum BRS 506 was more tolerant to salt than water stress and used Na+ compartmentalization in root cells as the main tolerance mechanism.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq

Fundação de Amparo e Promoção da Ciência, Tecnologia e Inovação do RN—FAPERN

Publisher

MDPI AG

Subject

Plant Science,Agronomy and Crop Science,Food Science

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