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Influences of different iron levels on plant growth and photosynthesis of W. Murcott mandarin grafted on two rootstocks under high pH conditions

W. Murcott scion, budded onto two rootstocks, was evaluated under high pH conditions supplied with different Fe levels. Plant dry weight, leaf area, iron chlorosis symptom scale, leaf chlorophyll concentration, net photosynthetic rate, and ferric-chelate reductase (FCR) activity variables were investigated under high pH conditions. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2015) 39: 838-844 © TÜBİTAK doi:10.3906/tar-1501-25 http://journals.tubitak.gov.tr/agriculture/ Research Article Influences of different iron levels on plant growth and photosynthesis of W. Murcott mandarin grafted on two rootstocks under high pH conditions Meral İNCESU*, Turgut YEŞİLOĞLU, Berken ÇİMEN, Bilge YILMAZ Department of Horticulture, Faculty of Agriculture, Çukurova University, Adana, Turkey Received: 06.01.2015 Accepted/Published Online: 16.02.2015 Printed: 30.09.2015 Abstract: W. Murcott scion, budded onto two rootstocks, was evaluated under high pH conditions supplied with different Fe levels. Plant dry weight, leaf area, iron chlorosis symptom scale, leaf chlorophyll concentration, net photosynthetic rate, and ferric-chelate reductase (FCR) activity variables were investigated under high pH conditions. Control plants (T1) produced the most leaf area, whereas plants grown without Fe (T2) produced the least. Dry weight was highest in ‘Volkameriana’ T1 (control) plants and lowest in ‘Swingle citrumelo’ T3 (10 µM Fe and 7.8 pH) and T2 (0 µM Fe and 7.8 pH) treatments. Significant differences in SPAD and iron chlorosis scale reading were found between rootstocks and treatments. Treatments significantly affected the net photosynthetic rate of the W. Murcott mandarin. Moreover, it was found that tolerant rootstock had higher FCR activity in application T2 than in applications T3 and T4 (100 µM Fe and 7.8 pH). The data of the present study suggested that scion budded onto Volkameriana rootstock showed a higher tolerance to iron deficiency than those budded onto Swingle citrumelo under high pH conditions. Key words: Iron chlorosis, high pH, W. Murcott, photosynthesis, Swingle citrumelo, Volkameriana 1. Introduction Iron is the fourth most abundant element on earth, and soil typically contains 1%–5% total iron. Most iron in the soil is found in silicate minerals or iron oxides and .