Journal of Taiwan Agricultural Research

Author:Jau-Yueh Wang* and Menq-Jiau Tseng

Abstract:

    Chlorophyll fluorescence is a subtle reflection of primary photosynthesis reaction; it is a non-invasive method for estimating the photosynthesis performance.  The photosynthetic activities of 12 lines of sweet pepper were investigated under suitable temperature (27/22℃) and high temperature (33/22℃) environments.  These were six heat tolerant lines of bell type and three paprika types, and heat susceptible lines of two bell types and one commercial cultivar.  At suitable temperature regime, the heat tolerant lines of ‘C02080 ’and ‘RB102’ showed higher efficiency of PSⅡ among 12 lines based on the chlorophyll fluorescence parameters of Fv/Fm (Maximal quantum efficiency of PSⅡ photochemistry).  While under high temperature, the heat tolerant lines of ‘C02080’ and ‘C00611A’ had better efficiency of PSⅡ by Fv/Fm parameters.  Furthermore, the observations through fluorescence microscope revealed that high temperature stunted pollen tube growth except heat tolerant lines of ‘C02080’ and ‘C00611A’, while all stigmatic receptivity remained unaffected.  In summary, both of chlorophyll fluorescence analysis and effective pollination elucidated showed that ‘C02080’ and ‘C00611A’ had better performance under heat stress.  From these consistent physiological estimations, it suggested that chlorophyll fluorescence analysis would be benefit as a convenient method for heat tolerance evaluation in field for sweet pepper.

Key words:Chlorophyll fluorescence, Pollen tube growth, Heat tolerance, Sweet pepper

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