| Journal: | Acta scientiarum. Agronomy |
| Database: | PERIÓDICA |
| System number: | 000459613 |
| ISSN: | 1679-9275 |
| Authors: | Ávila, Roniel Geraldo1 Magalhães, Paulo César2 Silva, Eder Marcos da1 Alvarenga, Amauri Alves de1 Reis, Caroline Oliveira dos1 Custódio, Aldo Max3 Jakelaitis, Adriano3 Souza, Thiago Corrêa de4 |
| Institutions: | 1Universidade Federal de Lavras, Lavras, Minas Gerais. Brasil 2Empresa Brasileira de Pesquisa Agropecuaria, Milho e Sorgo, Sete Lagoas, Minas Gerais. Brasil 3Instituto Federal Goiano, Rio Verde, Goias. Brasil 4Universidade Federal de Alfenas, Alfenas, Minas Gerais. Brasil |
| Year: | 2022 |
| Volumen: | 44 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | The objective of this study was to evaluate the the ability of foliar application of potassium nitrate (KNO3) to induce water deficit tolerance in sorghum plants (Sorghum bicolor cv. P898012) subjected to water deficit at pre-flowering. The experiment was conducted under greenhouse conditions with 4 treatments: field capacity (FC), water deficit (WD), field capacity + KNO3 (FC + KNO3), and water deficit + KNO3 (WD + KNO3). Two foliar applications of 3% (m/v) KNO3 were made, the first on day zero of stress and the second on the fifth day. All analyses were performed after 12 days of stress (end of stress). Foliar application of KNO3 to irrigated plants led to increases in relative chlorophyll content, photosynthetic rate, stomatal conductance, transpiration, and carboxylation efficiency. It also induced increases in leaf concentrations of P, Mg, S, Cu, and Fe, in addition to height growth. Under water deficit conditions, plants treated with KNO3 presented higher relative chlorophyll content, leaf area, photosynthetic rate, stomatal conductance, transpiration, carboxylation efficiency, and higher levels of P, K, Mg, S, Cu, and Fe than those not treated with KNO3. The morphometry of the root system was not altered by the treatments. In addition, plants treated with KNO3 under water deficit conditions showed higher growth and a grain yield 32.2% higher than those that did not receive KNO3. These results demonstrated that KNO3 applied to the leaves induced water deficit tolerance in sorghum plants subjected to severe water stress at pre-flowering |
| Disciplines: | Agrociencias |
| Keyword: | Leguminosas, Sorgo, Nitrato de potasio, Hojas, Estrés hídrico, Sorghum bicolor |
| Keyword: | Legumes, Sorghum, Potassium nitrate, Leaves, Water stress, Sorghum bicolor |
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