IBIS-Flora

Angiosperm Flora of India

5-Aminolevulinic Acid Activates Antioxidative Defence System and Seedling Growth in Brassica napus L. under Water-Deficit Stress

Publication Type:Journal Article
Year of Publication:2011
Authors:Liu, D, Pei, ZF, Naeem, MS, Ming, DF, Liu, HB, Khan, F, Zhou, WJ
Journal:Journal of Agronomy and Crop Science
Volume:197
Issue:4
Date Published:2011
ISBN Number:1439-037X
Keywords:5-aminolevulinic acid, antioxidants, Brassica, Brassica napus, cotyledon, reactive oxygen species, water-deficit stress
Abstract:

The present study assesses the effects of 5-aminolevulinic acid (ALA, 0, 0.1, 1 and 10 mg l−1) on the growth of oilseed rape (Brassica napus L. cv. ZS758) seedlings under water-deficit stress induced by polyethylene glycol (PEG 6000, 0 and −0.3 MPa). Water-deficit stress imposed negative effects on seedling growth by reducing shoot biomass, cotyledon water potential, chlorophyll content and non-enzymatic antioxidants (glutathione and ascorbic acid) levels. On the other hand, water-deficit stress enhanced the malondialdehyde (MDA) content, reactive oxygen species (ROS) production, enzymatic antioxidants activities, reduced/oxidized glutathione ratio (GSH/GSSG) and reduced/oxidized ascorbic acid (ASA/DHA) ratio in seedlings. Application of ALA at lower dosages (0.1 and 1 mg l−1) improved shoot weight and chlorophyll contents, and decreased MDA in rape seedlings, whereas moderately higher dosage of ALA (10 mg l−1) hampered the growth. The study also indicated that 1 mg l−1 ALA improved chlorophyll content, but reduced MDA content and ROS production significantly under water-deficit stress. Lower dosages of ALA (0.1 and 1 mg l−1) also enhanced GSH/GSSG and ASA/DHA as compared to the seedlings under water-deficit stress. The antioxidant enzymes (ascorbate peroxidase, peroxidase, catalase, glutathione reductase and superoxide dismutase) enhanced their activities remarkably with 1 mg l−1 ALA treatment under water-deficit stress. It was also revealed that 1 mg l−1 ALA treatment alone induced the expression of APX, CAT and GR substantially and under water-deficit stress conditions ALA treatment could induce the expression of POD, CAT and GR to a certain degree. These results indicated that 0.1–1 mg l−1 ALA could enhance the water-deficit stress tolerance of oilseed seedlings through improving the biomass accumulation, maintaining a relative high ratio of GSH/GSSG and ASA/DHA, enhancing the activities of the specific antioxidant enzymes and inducing the expression of the specific antioxidant enzyme genes.

URL:http://dx.doi.org/10.1111/j.1439-037X.2011.00465.x
Short Title:Journal of Agronomy and Crop Science
Fri, 2014-01-24 22:04 -- admin
https://secure.gravatar.com/avatar/5ade1b012674ce3dd941e2ea5dd15cc1.jpg?d=https%3A//flora.indianbiodiversity.org/sites/all/modules/patches/contrib/gravatar/avatar.png&s=100&r=G
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith