Cadmium stress effects on photosynthesis and PSII efficiency in tomato grown on NO3−or NH4+as nitrogen source
Year: 2010
Type: article
Abstract: This work investigates the combined effects of N form and Cd treatment on photosynthesis of tomato (Solanum lycopersicum Mill. cv Ibiza F1). Our study shows that, compared to plants fed with NO3“, dry weight, fresh weight and leaf area decrease when plants received NH4 + as N form. Regardless the N form used, Cd inhibits this parameters. In this report we show that, when grown in NH4 +, Cd—stressed seedlings accumulate higher levels of chlorophyll. Under Cd stress, water content, transpiration rate (E), stomatal conductance (Gs) and photosynthetic activity (Amax) decreased in plants fed with NO3 − and increased in NH4 +- grown-plants. The Fv/Fm ratio of dark adapted leaves was lower in NH4+- grown tomato compared to in NO3“-grown seedlings. Upon exposure to metal, the Fv/Fm ratio and the fraction of open PSII reaction centers (qp) were depressed by Cd in NO3“−grown plants and enhanced in NH4 +-grown ones. NPQ stimulated by Cd in NO3 −-grown plants was inhibits in NH4 +-grown ones.
Source: Acta Botanica Gallica
Institutions: Tunis University, Tunis El Manar University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2093673680