Simulation of Photosynthetic Quantum Efficiency and Energy Distribution Analysis Reveals Differential Drought Response Strategies in Two (Drought-Resistant and -Susceptible) Sugarcane Cultivars

Overview

Journal Plants (Basel)

Date 2023 Mar 11

PMID 36903903

Authors

Dongsheng An

Baoshan Zhao

Yang Liu

Zhijun Xu

Ran Kong

Chengming Yan

Junbo Su

Affiliations

Soon will be listed here.

Abstract

Selections of drought-tolerant cultivars and drought-stress diagnosis are important for sugarcane production under seasonal drought, which becomes a crucial factor causing sugarcane yield reduction. The main objective of this study was to investigate the differential drought-response strategies of drought-resistant ('ROC22') and -susceptible ('ROC16') sugarcane cultivars via photosynthetic quantum efficiency () simulation and analyze photosystem energy distribution. Five experiments were conducted to measure chlorophyll fluorescence parameters under different photothermal and natural drought conditions. The response model of to photosynthetically active radiation (), temperature (), and the relative water content of the substrate () was established for both cultivars. The results showed that the decreasing rate of was higher at lower temperatures than at higher temperatures, with increasing under well-watered conditions. The drought-stress indexes () of both cultivars increased after decreased to the critical values of 40% and 29% for 'ROC22' and 'ROC16', respectively, indicating that the photosystem of 'ROC22' reacted more quickly than that of 'ROC16' to water deficit. An earlier response and higher capability of nonphotochemical quenching () accompanied the slower and slighter increments of the yield for other energy losses () for 'ROC22' (at day5, with a of 40%) compared with 'ROC16' (at day3, with a of 56%), indicating that a rapid decrease in water consumption and an increase in energy dissipation involved in delaying the photosystem injury could contribute to drought tolerance for sugarcane. In addition, the of 'ROC16' was lower than that of 'ROC22' throughout the drought treatment, suggesting that high water consumption might be adverse to drought tolerance of sugarcane. This model could be applied for drought-tolerance assessment or drought-stress diagnosis for sugarcane cultivars.

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