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<p>Little millet (<i>Panicum sumatrense</i>), a climate-resilient crop, is gaining attention for its nutritional value and ability to withstand environmental stresses. While the crop is well-studied for its drought tolerance, there is limited research on its response to waterlogging stress. Waterlogging, characterized by prolonged soil saturation and limited oxygen availability, hinders the growth of both roots and shoots, thereby negatively influencing crop productivity. A key adaptation to waterlogging in plants is the formation of aerenchyma, specifically of the lysigenous type, which improves oxygen transport to roots, aiding in survival under anaerobic conditions. This study investigates the morphological and physiological responses of little millet to transient waterlogging, focusing on the development of lysigenous aerenchyma and its role in waterlogging tolerance. Genotype OBN P-2528, maintained 21.91% aerenchyma formation along with higher chlorophyll content, higher shoot, root dry weight and shoot length exhibiting the highest waterlogging tolerance while genotype OBN P-2558, which has lesser aerenchyma formation, showed the highest mortality rate. These findings highlight the critical role of lysigenous aerenchyma in the crop’s adaptation to waterlogged environments, offering potential strategies for enhancing waterlogging tolerance in little millet.</p>

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Development of Lysigenous Aerenchyma in Root Alleviates the Waterlogging Stress in Little Millet

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Ritik Raj,
  • Shailesh Kumar,
  • Sweta Mishra,
  • Dayanji Sherpa

摘要

Little millet (Panicum sumatrense), a climate-resilient crop, is gaining attention for its nutritional value and ability to withstand environmental stresses. While the crop is well-studied for its drought tolerance, there is limited research on its response to waterlogging stress. Waterlogging, characterized by prolonged soil saturation and limited oxygen availability, hinders the growth of both roots and shoots, thereby negatively influencing crop productivity. A key adaptation to waterlogging in plants is the formation of aerenchyma, specifically of the lysigenous type, which improves oxygen transport to roots, aiding in survival under anaerobic conditions. This study investigates the morphological and physiological responses of little millet to transient waterlogging, focusing on the development of lysigenous aerenchyma and its role in waterlogging tolerance. Genotype OBN P-2528, maintained 21.91% aerenchyma formation along with higher chlorophyll content, higher shoot, root dry weight and shoot length exhibiting the highest waterlogging tolerance while genotype OBN P-2558, which has lesser aerenchyma formation, showed the highest mortality rate. These findings highlight the critical role of lysigenous aerenchyma in the crop’s adaptation to waterlogged environments, offering potential strategies for enhancing waterlogging tolerance in little millet.