Photosynthetica 2008, 46(3):476 | DOI: 10.1007/s11099-008-0082-0
Effects of aluminium on photosynthetic performance in Al-sensitive and Al-tolerant maize inbred lines
- 1 Institute for the Application of Nuclear Energy (INEP), Zemun, Serbia
- 2 Institute for Multidisciplinary Research, Belgrade, Serbia
Maize plant inbred lines, one Al-sensitive (B-73) and two Al-tolerant (F-2 and L-2039), were grown hydroponically in the presence of 200 µM Al. After 13 d of growth, root and shoot lengths, photosystem 2 (PS2) activity, chlorophyll (Chl) content, 5-aminolevulinic acid (5-ALA) synthesis rate, chlorophyllase (Chlase) activity, and N, Mg, Fe, and Mn contents in leaves were determined. PS2 activity and Chl content were most severely affected by Al in B-73, but F-2 was almost unaffected. This was in accordance with Al-accumulation in the plants. The observed changes in B-73 coincided with 5-ALA synthesis inhibition, Chlase activation, and leaf deprivation of Fe and Mg. In Al-treated L-2039 plants, the leaf Mg and Mn contents were decreased. Also, an excessive Chlase activation was found in Al-treated L-2039, without a substantial Chl loss. This may indicate the activation of different enzyme pools in tolerant and sensitive genotypes under low-stress conditions.
Additional key words: 5-aminolevulinic acid; chlorophyll; chlorophyllase; Fe; genotype susceptibility; Mg; Mn; N; photosystem 2; root; shoot
Received: October 8, 2007; Accepted: May 5, 2008; Published: September 1, 2008 Show citation
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