The objective of this study was to investigate the effect of Selenium (Se) supply (0, 3, 6, 12, 24 mg kg−1) on the growth,
photosynthetic characteristics, Se accumulation and distribution of flue-cured tobacco (Nicotiana tabacum L.). Results
showed that low-dose Se treatments (≤6 mg kg−1) stimulated plant growth but high-dose Se treatments (≥12 mg kg−1)
hindered plant growth. Optimal Se dose (6 mg kg−1) stimulated plant growth by reducing MDA content and improving
photosynthetic capability. However, excess Se (24 mg kg−1) increased MDA content by 28%, decreased net photosynthetic
rate and carboxylation efficiency by 34% and 39%, respectively. The Se concentration in the roots, stems, and leaves of the
tobacco plants significantly increased with increasing Se application. A linear correlation (R = 0.95, P < 0.01) was observed
between Se level and tobacco plant tissue Se concentration. This correlation indicated that the tobacco plant tissues were
not saturated within the concentration range tested. The pattern of total Se concentration in the tobacco plant tissues followed
the order root > leaf > stem. The Se concentration in the roots was 3.17 and 7.57 times higher than that in the leaves
and stems, respectively, after treatment with 24 mg kg−1 Se. In conclusion, the present study suggested that optimal Se dose
(6 mg kg−1) improved the plant growth mainly by enhancing photosynthesis, stomatal conductance, carboxylation efficiency
and Rubisco content in the flue-cured tobacco leaves. However, the inhibition of excess Se on tobacco growth might be due
to high accumulation of Se in roots and the damage of photosynthesis in leaves.
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