Brassica napus (rape) seedlings were treated with different concentrations of strontium (1, 5, 10, 20 mmol·L–1SrCl2) for 21 days, and the effect of strontium on the photosynthesis of rape leaves was investigated by chlorophyll fluorescence induction dynamics and photosynthetic gas exchange parameters. Photosystem II potential activity, actual photochemical efficiency, apparent photosynthetic electronic transfer rate, and photochemical quenching increased with low strontium concentration (1, 5 mmol·L–1) but decreased with high concentration (10, 20 mmol·L–1). Minimum fluorescence and non-photochemical quenching did not change significantly with low strontium concentration but significantly increased with high concentration. Net photosynthetic rate and transpiration rate of leaves significantly increased with low strontium concentration but decreased with high concentration; stomatal conductance significantly decreased with increasing strontium concentration; intercellular CO2 concentration increased with high concentration. Chlorophyll content significantly increased with low strontium concentration and decreased with high concentration. Thus, low strontium concentration could improve photosynthetic function of rape seedlings and increase photosynthetic efficiency, but a high concentration can harm the photosynthetic apparatus and significantly inhibit photosynthetic efficiency.
Lulu Zhou, Yunlai Tang, Xia Chen, Mei Chen, Dan Wang
. Effect of Strontium on Photosynthesis of Leaves in Rape Seedlings[J]. Chinese Bulletin of Botany, 2013
, 48(3)
: 313
-319
.
DOI: 10.3724/SP.J.1259.2013.00313
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