Photosynthetica, 2017 (vol. 55), issue 2

Photosynthetica 2017, 55(2):338-350 | DOI: 10.1007/s11099-016-0643-6

Selenium delays leaf senescence in oilseed rape plants

S. Rahmat2, R. Hajiboland1,2,*, N. Sadeghzade2
1 Center of Excellence for Biodiversity, University of Tabriz, Tabriz, Iran
2 Plant Science Department, University of Tabriz, Tabriz, Iran

Effect of selenium on leaf senescence was studied in oilseed rape plants treated with 10 μM Na2SeO4 at a rosette growth stage. In addition to developmental senescence, N deficiency and leaf detachment were used for induction of senescence. Nonphotochemical quenching declined in old leaves as senescence became more advancing but rose progressively in the plants supplied by Se. The total carbohydrate and protein pools decreased with leaf age, while increased by the Se treatment. However, during senescence induced by N deficiency, Se did not change remarkably the C and N metabolism, but delayed senescence mainly through protection of plants from photoinhibitory effects. After detachment, untreated leaves became chlorotic and necrotic, while the Se-treated ones remained fairly green. Our results demonstrated that Se delayed leaf senescence by a maintaining or even improving photochemical activities. During developmental senescence, the Se effect on the extending life span of the leaves was additionally linked to the metabolic regulation of senescence.

Keywords: leaf photochemistry; nitrate reductase; photosynthetic rate; chlorophyll fluorescence

Received: March 11, 2016; Accepted: May 13, 2016; Published: June 1, 2017Show citation

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Rahmat, S., Hajiboland, R., & Sadeghzade, N. (2017). Selenium delays leaf senescence in oilseed rape plants. Photosynthetica, 55(2), 338-350. doi: 10.1007/s11099-016-0643-6.
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