ISHS Acta Horticulturae 726: IV International Symposium on Pistachios and Almonds
USING CHLOROPHYLL FLUORESCENCE TO STUDY PHOTOSYNTHETIC ACTIVITIES IN SWEET ALMOND (PRUNUS DULCIS MILL. ( IN RESPONSE TO SALINITY STRESS |
| Author: | A. Ranjbar |
| Keywords: | quinone, photochemical, photosynthesis, chlorophyll, photosystem |
| Abstract:
Plants of sweet almond (Prunus dulcis) were submitted to four levels of salt stress (3, 4, 7 and 10 dS m-1) induced by NaCl. Effects of salt stress on a range of chlorophyll fluorescence parameters and main leaf pigments (Chl a and Chl b) were investigated in order to know the resistance of P. dulcis to this kind of stress. Salinity stress promoted drastic changes in chlorophyll fluorescence parameters due to its adverse effect on activity of PS2 and destruction of chlorophyll pigments via accumulation of ions that may influence the reduction of electron acceptor of PS2 (Quinone a). Fv/Fm ratio, which is an excellent indicator of PS2 quantum yield, was considerably affected with increasing salt stress. Decreasing trend of qp with increasing salt stress can be attributed to harm of both acceptor and donor side of PS2. It is concluded that salt stress negatively impacted P. dulcis photosynthesis activity through alteration of PS2 structure. However, this negative influence was significant at concentrations exceeding 3 dS m-1. In addition, chlorophyll fluorescence is a suitable screening technique for assessing the effect of environmental stresses on perennial plants. | |
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