Photosynthetic responses of a salt secretor mangrove, Avicennia germinans, exposed to salinity stress

Abstract

In the present study, the effect of variable salinity (0, 15 and 60‰ NaCl) on photosynthetic apparatus was studied in plants (Avicennia germinans seedlings) of a salt secretor mangrove, by measuring chlorophyll fluorescence parameters and gas exchange. Plants treated with NaCl showed a decrease in the maximum net photosynthetic rate (Pn) and stomatal conductance (gs) as salinity increased from 0 to 60‰. The yield for primary photochemistry (TRo/ABS) and the efficiency with which a trapped exciton can move an electron into the electron transport chain (ETo/TRo), the performance index of Photosystem II (PIABS), and the total number of active reaction centers per absorption (RC/ABS) also decreased when exposed to the highest salinity stress (60‰). These results indicated that the main targets in PSII affected by elevated salinity were inactivation of reaction centers and inhibition of the electron transport at the acceptor side of Photosystem II.

Evaluation for Photosynthetic Characteristics in upland cotton germplasm based on chlorophyll a fluorescence

“…In our study, 189 upland cotton cultivars (strains) are classified, which provided photosynthetic traits of germplasm for breeders (Table S4- 12). If breeders need to select cultivars (strains) with high photosynthetic potential, which can be obtained in the first category of PI(abs).…”

“…Chlorophyll a fluorescence (CF) has been accepted widely as a reliable and popular tool in photosynthesis research [3,4]. CF signals contain rich photosynthesis information and can be widely used to quickly monitor state of leaves photosynthesis of plants under stress [5][6][7] such as temperature [8,9], moisture [10], salt [11,12], nutrient element [13,14], plant senescence [15], mutagenesis [16] and pathogen infection [17,18] and so on. However, CFPs are strongly affected by the environment [19,20], which greatly increased difficulties to select cultivars (strains) with good photosynthetic performance.…”

The Response of Regeneration Ability of Myriophyllum spicatum Apical Fragments to Decaying Cladophora oligoclona

“…In contrast to F V /F M , PI ABS is a more sensitive photosynthetic parameter that reflects the state of the photosynthetic system and can detect plant stress even before significant symptoms appear on the leaf [50,51]. The significant decreases of PI ABS in T2 and T3 mean visible vitality losses in PSII [52].…”