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Research on Photosynthetic Characteristics of Cassava Leaf under Moderate Water Stress

Yang Chong-fa

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Abstract

The leaf photosynthetic parameters of cv.SC8 and cv.SC205 were researched by using LI-6400 portable photosynthesis system under moderate water stress in the pot experiment.Results showed that(ⅰ)net photosynthetic rate(Pn) and stomatal conductance(Gs) of SC8 and SC205 increased with enhanced intensity of illumination,but intercellular CO2 concentration(Ci) tended to decrease under normal water supply conditions or water stress;and that Pn and Gs of SC8 were higher than that of SC205,but Ci of SC8 were lower than that of SC205.(ⅱ)When two cassava varieties suffered from moderate water stress,the results showed that apparent dark respiration(C0) significantly increased,maximum photosynthesis rate(Pmax) and apparent quantum yield(α) significantly decreased,while light saturation point(LSP) only decreased and the light compensation point (LCP) only increased.

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What this paper is about

The leaf photosynthetic parameters of cv.SC8 and cv.SC205 were researched by using LI-6400 portable photosynthesis system under moderate water stress in the pot experiment.Results showed that(ⅰ)net photosynthetic rate(Pn) and stomatal conductance(Gs) of SC8 and SC205 increased with enhanced intensity of illumination,but intercellular CO2 concentration(Ci) tended to decrease under normal water supply conditions or water stress;and that Pn and Gs of SC8 were higher than that of SC205,but Ci of SC8 were lower than that of SC205.(ⅱ)When two cassava varieties suffered from moderate water stress,the results showed that apparent dark respiration(C0) significantly increased,maximum photosynthesis rate(Pmax) and apparent quantum yield(α) significantly decreased,while light saturation point(LSP) only decreased and the light compensation point (LCP) only increased.

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Available abstract

The leaf photosynthetic parameters of cv.SC8 and cv.SC205 were researched by using LI-6400 portable photosynthesis system under moderate water stress in the pot experiment.Results showed that(ⅰ)net photosynthetic rate(Pn) and stomatal conductance(Gs) of SC8 and SC205 increased with enhanced intensity of illumination,but intercellular CO2 concentration(Ci) tended to decrease under normal water supply conditions or water stress;and that Pn and Gs of SC8 were higher than that of SC205,but Ci of SC8 were lower than that of SC205.(ⅱ)When two cassava varieties suffered from moderate water stress,the results showed that apparent dark respiration(C0) significantly increased,maximum photosynthesis rate(Pmax) and apparent quantum yield(α) significantly decreased,while light saturation point(LSP) only decreased and the light compensation point (LCP) only increased.

Key concepts: Photosynthesis, Compensation point, Stomatal conductance, Respiration rate, Respiration, Water stress, Horticulture, Water-use efficiency

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