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<p>Sugarcane is a water-intensive crop, and optimizing its water use requires understanding physiological responses to water deficit stress. Moisture deficit in leaves reduces the rate of photosynthesis by depleting the efficiency of PSII, measured by chlorophyll fluorescence. This study evaluated the impact of leaf desiccation on PSII sensitivity in sugarcane cultivar Co-86032 using desiccated and non-desiccated treatments. Chlorophyll fluorescence transients were recorded every two hours, and 23 out of 83 transients effectively captured desiccation effects. The polynomial regression analysis conducted for each transient in relation to leaf moisture content revealed for the first time, the threshold tolerance of 23 transients to depleting leaf moisture. A significant 50% decrease was observed in Fq_Ln, Fq_Lss, QY_Ln, and QY_Lss as tissue moisture declined by 20%. PCA analysis classified 23 transients into three distinct classes. Class I revealed substantial reductions in variable fluorescence (Fv) and PSII maximum efficiency of light adapted sample (Fv/Fm_Ln). Class II elucidated the difference in fluorescence between Fm_Ln and Ft_Ln in light (Fq_L1, Fq_L2, Fq_L3, Fq_L4, Fq_Lss). Class III demonstrated a notable decrease in instantaneous PSII quantum yield during light adaptation (QY_L1, QY_L2, QY_L3, QY_L4, QY_Lss) and non-photochemical quenching transients (NPQ_L4, NPQ_Lss, Rfd_Lss), reflecting the diminished capacity for energy utilization and photochemical processes under desiccated conditions. These findings highlight key fluorescence parameters as sensitive indicators of water stress, supporting their integration into remote sensing tools for real-time, precision monitoring in sugarcane cultivation.</p>

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Chlorophyll fluorescence transients as indicators for rapid detection of desiccation in sugarcane (Saccharum officinarum L.)

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Vinay Hegde,
  • V. S. J. Sunoj,
  • Aliza Pradhan,
  • Debasmita Mohanty,
  • Tarasingh Rathod,
  • Jagadish Rane

摘要

Sugarcane is a water-intensive crop, and optimizing its water use requires understanding physiological responses to water deficit stress. Moisture deficit in leaves reduces the rate of photosynthesis by depleting the efficiency of PSII, measured by chlorophyll fluorescence. This study evaluated the impact of leaf desiccation on PSII sensitivity in sugarcane cultivar Co-86032 using desiccated and non-desiccated treatments. Chlorophyll fluorescence transients were recorded every two hours, and 23 out of 83 transients effectively captured desiccation effects. The polynomial regression analysis conducted for each transient in relation to leaf moisture content revealed for the first time, the threshold tolerance of 23 transients to depleting leaf moisture. A significant 50% decrease was observed in Fq_Ln, Fq_Lss, QY_Ln, and QY_Lss as tissue moisture declined by 20%. PCA analysis classified 23 transients into three distinct classes. Class I revealed substantial reductions in variable fluorescence (Fv) and PSII maximum efficiency of light adapted sample (Fv/Fm_Ln). Class II elucidated the difference in fluorescence between Fm_Ln and Ft_Ln in light (Fq_L1, Fq_L2, Fq_L3, Fq_L4, Fq_Lss). Class III demonstrated a notable decrease in instantaneous PSII quantum yield during light adaptation (QY_L1, QY_L2, QY_L3, QY_L4, QY_Lss) and non-photochemical quenching transients (NPQ_L4, NPQ_Lss, Rfd_Lss), reflecting the diminished capacity for energy utilization and photochemical processes under desiccated conditions. These findings highlight key fluorescence parameters as sensitive indicators of water stress, supporting their integration into remote sensing tools for real-time, precision monitoring in sugarcane cultivation.