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<p>The seasonality of forage production is one of the main challenges in semi-arid regions, where environmental conditions limit agricultural productivity. One promising option is the use of elephant grass ‘BRS Capiaçu’, together with deficit irrigation. This study evaluated the impact of different irrigation depths with brackish water (50%, 75%, 100% and 125% of the reference evapotranspiration – ET<sub>0</sub>) on the productive, physiological, photochemical and biochemical aspects of ‘BRS Capiaçu’ over two cycles. Irrigation with 50% of the ET<sub>0</sub> resulted in lower rates of net photosynthesis (P<sub><i>n</i></sub>), with a reduction in photosystem II quantum yield (ΔF/Fm’), qP, NPQ and the electron transport rate (ETR), in addition to greater activity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX), indicating oxidative stress. The depths of 50% and 100% of the ET<sub>0</sub> resulted in greater dry matter production, for Cycles 1 and 2, respectively, demonstrating the resilience of the crop to water stress, attributed to such mechanisms of acclimatisation as a reduction in transpiration (T<sub><i>r</i></sub>) and an increase in water use efficiency. These physiological changes were more obvious during Cycle 2, in which the crop was subjected to lower rainfall (47.8&#xa0;mm), while salt stress was also more pronounced during this period, in response, the plants showed less water loss through transpiration and larger WUE<sub>inst</sub>. It was concluded that ‘BRS Capiaçu’ has a high capacity for acclimatisation to semi-arid conditions, and stands out as a viable alternative for mitigating the seasonality of forage production and promoting sustainable livestock farming in the region.</p>

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Productive, physiological, and biochemical responses of elephant grass ‘BRS Capiaçu’ (Pennisetum purpureum Schumach.) under different water regimes with brackish water in a semi-arid environment

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  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • Lara Rosa de Lima-Silva,
  • Lady Daiane Costa de Sousa Martins,
  • Alexandre Maniçoba da Rosa Ferraz Jardim,
  • Wagner Martins dos Santos,
  • Pedro Paulo Santos de Souza,
  • Luciana Sandra Bastos de Souza,
  • Cleber Pereira Alves,
  • Agda Raiany Mota dos Santos,
  • Ênio Farias de França e Silva,
  • Hugo Rafael Bentzen Santos,
  • Wilma Roberta dos Santos,
  • Carlos André Alves de Souza,
  • Adriano Nascimento Simões,
  • Sérgio Luiz Ferreira-Silva,
  • Elania Freire da Silva,
  • José Francisco da Cruz Neto,
  • Xuguang Tang,
  • João L. M. P. de Lima,
  • Thieres George Freire da Silva

摘要

The seasonality of forage production is one of the main challenges in semi-arid regions, where environmental conditions limit agricultural productivity. One promising option is the use of elephant grass ‘BRS Capiaçu’, together with deficit irrigation. This study evaluated the impact of different irrigation depths with brackish water (50%, 75%, 100% and 125% of the reference evapotranspiration – ET0) on the productive, physiological, photochemical and biochemical aspects of ‘BRS Capiaçu’ over two cycles. Irrigation with 50% of the ET0 resulted in lower rates of net photosynthesis (Pn), with a reduction in photosystem II quantum yield (ΔF/Fm’), qP, NPQ and the electron transport rate (ETR), in addition to greater activity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX), indicating oxidative stress. The depths of 50% and 100% of the ET0 resulted in greater dry matter production, for Cycles 1 and 2, respectively, demonstrating the resilience of the crop to water stress, attributed to such mechanisms of acclimatisation as a reduction in transpiration (Tr) and an increase in water use efficiency. These physiological changes were more obvious during Cycle 2, in which the crop was subjected to lower rainfall (47.8 mm), while salt stress was also more pronounced during this period, in response, the plants showed less water loss through transpiration and larger WUEinst. It was concluded that ‘BRS Capiaçu’ has a high capacity for acclimatisation to semi-arid conditions, and stands out as a viable alternative for mitigating the seasonality of forage production and promoting sustainable livestock farming in the region.