Responses of Pinus massoniana seedlings to lead stress

• Published in: Biologia plantarum Vol. 61; no. 4; pp. 785 - 790
• Main Authors: Zhang, L. L., Zhu, X. M., Kuang, Y. W.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-12-2017; Springer Nature B.V; Institute of Experimental Botany of the Czech Academy of Sciences
• Subjects: Antioxidants; ascorbate; Ascorbic acid; Biomedical and Life Sciences; Brief Communication; Catalase; Chlorophyll; Glutathione; Lead; Life Sciences; Malondialdehyde; masson pine; Physiological responses; Pine; Pine needles; Pine trees; Pinus massoniana; Plant Sciences; Proline; Roots; Seedlings; Stress; Stresses; Superoxide dismutase; proline; glutathione; superoxide dismutase; ascorbate; chlorophyll; malondialdehyde; catalase; Masson pine
• ISSN: 0006-3134; 1573-8264
• DOI: 10.1007/s10535-017-0710-2

To investigate the biochemical and physiological responses of Masson pine (
Pinus massoniana
Lamb.) seedlings to lead stress, needles, stems, and roots of two-year-old seedlings were treated with
207
PbCO
3
for 33 d and then analyzed 1 and 7 d after the treatment was completed. Chlorophyll (Chl)
b
responded more sensitively than Chl
a
to needle Pb treatment, and the Chl content in the needles significantly decreased after Pb application to roots. The malondialdehyde and proline content remained almost unchanged, but superoxide dismutase and catalase activities increased on day 1 after all ways of Pb application. The reduced glutathione (GSH) content and GSH/oxidized glutathione ratio increased on day 1 after Pb application to stem or needles compared to the controls. At 7 d after the Pb application, the increase in dehydroascorbate (DHA) content and the decrease in the ascorbate (AsA)/DHA ratio implied a decreased antioxidant capacity of AsA. The results indicated that the antioxidants were sensitive to the Pb treatments and might be involved in the Masson pine tolerance to Pb stress.