Foliar application of potassium nitrate induces tolerance to water deficit in pre-flowering sorghum plants



Título del documento: Foliar application of potassium nitrate induces tolerance to water deficit in pre-flowering sorghum plants
Revista: Acta scientiarum. Agronomy
Base de datos: PERIÓDICA
Número de sistema: 000459613
ISSN: 1679-9275
Autores: 1
2
1
1
1
3
3
4
Instituciones: 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
Año:
Volumen: 44
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, analítico
Resumen en inglés 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
Disciplinas: Agrociencias
Palabras clave: Leguminosas,
Sorgo,
Nitrato de potasio,
Hojas,
Estrés hídrico,
Sorghum bicolor
Keyword: Legumes,
Sorghum,
Potassium nitrate,
Leaves,
Water stress,
Sorghum bicolor
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