Application of Lake-model based indices from chlorophyll fluorescence on sugarcane seedling Application of Lake-model based indices from chlorophyll fluorescence on sugarcane seedling |
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| Authors: | AN Dong-Sheng CAO Juan HUANG Xiao-Hua ZHOU Juan DOU Mei-An |
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| Affiliation: | Zhanjing Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangdong 524013, China
South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangdong 524091, China |
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| Abstract: | Aims Spring drought greatly limits the sugarcane (Saccharum officinarum) seedling growth in the southwest China. A major objective of this study is to investigate the change of the energy allocation in photosystem II (PSII) resulted from the stomatal and non-stomatal limit of photosynthesis under the drought stress condition. The study results can be used for drought resistant breeding and rapid drought stress diagnosis.
Methods Four levels (40%, 25%, 10% and 8%) of soil volumetric water content (VWC) have been chosen from natural drought treatments. The chlorophyll fluorescence parameters based on Lake-model were measured and analyzed with various levels of photosynthetically active radiation (PAR).
Important findings Results of the study in the enhanced drought stress for two tested cultivars (‘ROC22’ and ‘ROC16’) showed 1) decreased numbers in the maximum quantum use efficiency (Fv/Fm), the relative electron transport rate (rETR), the quantum efficiency of PSII (ΦII) and the photochemical quenching (qL) and 2) increased numbers in the down-regulated energy dissipation (ΦNPQ) and the non-light induced energy dissipation (ΦNO). There was no significant difference between the parameter qL of ‘ROC16’ and ‘ROC22’, except for the 8% level where the qL showed a sharp decline. The results indicated that the PSII of ‘ROC16’ remained a relatively high open fraction during the mild drought stress, but suffered severe damage in serious drought stress. The rising range of ΦNPQ for ‘ROC22’ were higher and more sensitive to drought stress than that of ‘ROC16’, which revealed a strong drought resistance resulted from strong photo-protective mechanism in‘ROC22’. The ΦNO was more sensitive to drought stress than Fv/Fm especially for non drought resistant variety, and remained high stability under different PAR. Therefore, ΦNO could be properly used as an indicator in drought stress diagnosis and resistance evaluation. Photo inhibition could be the initial factor leading to PSII damage and its signal had been amplified under high PAR related to photo inhibition since the appeared peak or decline of rETR related to increased PAR and its no significance at each water level and low PAR during drought stress. |
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| Keywords: | chlorophyll fluorescence drought stress Lake-model Sugarcane drought resistance evaluation |
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