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<p>Finger millet (<i>Eleusine coracana</i>) is a resilient crop, predominantly cultivated in the arid and semi-arid regions of Asia and Africa due to its high tolerance to hot and dry environment. In the present study, four promising genotypes of finger millet (BR 407, RAU 3, RAU 8 and RAU F-13) were subjected to water deficit (WD: 50% field capacity), high temperature (HT: 39.8 ± 1.5℃), and their combination (WD + HT). Root system architecture was assessed by rhizotron, revealing a significant reduction in all root parameters under stress conditions, with high temperature causing more severe effects than water deficit when applied individually. The greatest reduction was under combined stress (WD + HT) with significant decrement in root length (42.5%), root volume (67.1%), surface area (55.5%), average root diameter (25.3%), number of tips (28.8%), forks (56.2%) and crossings (66.5%). Genotypic evaluation showed that RAU 8 experienced the least negative impact of stresses for root length, surface area, number of tips, forks and crossings which indicated its better root development under these stress conditions. The investigation concluded that while finger millet exhibits tolerance to drought and heat, extreme conditions can severely compromise its root system development.</p>

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Individual and Combined Effect of Water Deficit and High Temperature Stress on Root Architecture of Finger Millet [Eleusine coracana (L.) Gaertn.] Genotypes

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Chandranshu Kastury,
  • Shailesh Kumar,
  • Sweta Mishra

摘要

Finger millet (Eleusine coracana) is a resilient crop, predominantly cultivated in the arid and semi-arid regions of Asia and Africa due to its high tolerance to hot and dry environment. In the present study, four promising genotypes of finger millet (BR 407, RAU 3, RAU 8 and RAU F-13) were subjected to water deficit (WD: 50% field capacity), high temperature (HT: 39.8 ± 1.5℃), and their combination (WD + HT). Root system architecture was assessed by rhizotron, revealing a significant reduction in all root parameters under stress conditions, with high temperature causing more severe effects than water deficit when applied individually. The greatest reduction was under combined stress (WD + HT) with significant decrement in root length (42.5%), root volume (67.1%), surface area (55.5%), average root diameter (25.3%), number of tips (28.8%), forks (56.2%) and crossings (66.5%). Genotypic evaluation showed that RAU 8 experienced the least negative impact of stresses for root length, surface area, number of tips, forks and crossings which indicated its better root development under these stress conditions. The investigation concluded that while finger millet exhibits tolerance to drought and heat, extreme conditions can severely compromise its root system development.