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Growth and photosynthesis of pea plants under different iron supply

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Abstract

Soil conditions, leading to iron deficiency or toxicity, are widespread in nature. Our objective was to study the effect of Fe supply, ranging from complete deficiency to excess, on growth and on some photosynthetic indices of pea plants. Both iron deficiency and toxicity decreased shoot and root growth. Complete deficiency resulted in a lower shoot/root ratio and a higher content of dry biomass per unit of fresh biomass in roots, while iron excess led to higher content of dry biomass per unit of fresh biomass in shoot. Complete deficiency was also characterized by low chlorophyll and carotenoid content, elevated ratios of chlorophyll a/chlorophyll b and carotenoids/chlorophylls, a drop of photosynthetic rate per leaf area, and an increase of photosynthetic rate per chlorophyll. The stomatal resistance substantially increased, while the transpiration rate decreased. Smaller changes in stomatal resistance and transpiration rate, but not in photosynthetic rate per leaf area, were found under partial iron deficiency and under excess of iron. In the first case, the chlorophyll content decreased, while in the second it increased. The maximum efficiency of photosystem II was unaffected by iron supply. Even when no genetic or experimental differences existed, changes in growth, pigment content and photosynthesis due to variation of Fe supply depended on the type and severity of the imposed stress, as well as on the studied parameter. A combination of indices described better the effect of iron supply, especially when small differences were characterized.

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Acknowledgments

This study was partly supported by the National Science Fund of the Bulgarian Ministry of Education and Science, Grant B-420 and Project PISA-INI 14/01.09.2005. The author is grateful to Mrs. Ana Trifonova for her excellent technical assistance.

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  1. Institute of Plant Physiology, Bulgarian Acad. Sci., Acad. G. Bonchev St., Block 21, Sofia, 1113, Bulgaria

    Veselina R. Nenova

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  1. Veselina R. Nenova
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Correspondence to Veselina R. Nenova.

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Communicated by G. Klobus.

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Nenova, V.R. Growth and photosynthesis of pea plants under different iron supply. Acta Physiol Plant 31, 385–391 (2009). https://doi.org/10.1007/s11738-008-0247-2

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