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

Acta Scientiarum: Agronomy

Paulo CésarMagalhães¹  AdrianoJakelaitis²  Aldo MaxCustódio²  Thiago Corrêa deSouza³  Roniel GeraldoÁvila⁴  Eder Marcos daSilva⁴  Amauri Alves deAlvarenga⁴  Caroline Oliveira dosReis⁴ 

[1] Empresa Brasileira de Pesquisa Agropecuária;Instituto Federal Goiano;Universidade Federal de Alfenas;Universidade Federal de Lavras;

关键词: mineral nutrition;    drought resistance;    leaf gas exchange;    chlorophyll fluorescence;    WinRhizo;    Sorghum bicolor.;   

DOI  :  10.4025/actasciagron.v44i1.53069

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown