final-1888.doc

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131912191714126 1 1510191510191414 19141811 17191012 19121912191014 12 1212181417 161914171919 / 141817 20/2 1219191911 2/ 111918 1389 2 Interactive Effect of Boron Toxicity and Rootstock on the Growth, Photosynthetic Rate and Nutrient Concentratio of Almond Tree M Oraei 1, SJ Tabatabaei 2*, A Imani 3 and E Fallahi 4 Received: 6 September 2009 Accepted: 6 June 2010 1 Ph.D Student of Horticultural Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran 2 Professor, Department of Horticultural Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran 3 Assistant Professor, Seed and Plant Improvement Ititute, Karaj, Iran 4 Professor, University of Idaho, Parma Research and Exteion Center, 29603 U of I Lane, Parma, Idaho, 83660, USA. *Corresponding author: E-mail : tabatabaei@tabrizu.ac.ir Abstract Boron toxicity is an important disorder that can limit plant growth in arid and semi-arid environments. It has been proven that use of tolerant rootstocks impede B uptake or traport to the aerial portio of plants. This may alleviate B toxicity in the scion, coequently improves the tolerance to excess B in the root zone. An experiment was conducted to find interactive effect of B toxicity and rootstock on vegetative growth, photosynthetic rate and nutrient concentratio of almond (Prunus dulcis Mill.) cv. ｰFerragnes ｱ grown in the controlled environment. Three levels of B (0.25, 10, 20 mg/l) from H 3 BO 3 and two almond rootstocks (GF 677, Tuono) were factorially combined in a randomized complete block design with four replicates. The results showed that the higher concentration of B had a significant diminish effects on vegetative and physiological characteristics as well nutrient concentratio of almond. The severity of the adverse effects of boron toxicity varied among rootstocks. Fresh and dry weights of leaf and root, leaf number, leaf area, photosynthetic rate and chlorophyll index was decreased with increasing B levels. Increased B levels led to decreased N, NO 3 -, P, K in the leaves while, B concentratio were increased. The concentration of B in stem was closely related to the development of B toxicity in rootstocks, imply that the mechanism of tolerance to higher B concentration in Tuono is associated with exclusion mechanism such as restrict B traport from root system to aerial parts. Hence, under excess B conditio Tuono can be used as tolerant rootstock for different almond cultivars. Keywords: Boron toxicity, Photosynthesis, Prunus dulcis Mill, Scion-rootstock combination 1916171911 1019171919 D.A.Weeb.) (Prunus dulcis [Mill.] 1419 14 1517 1410 1719 19151415 191217126 1 19111912191412 15141911 1919 1719 1614 1612191117 1910 161714191412191410 19151312181912 16121910191914 10121711 1911 191919121011 17191212 6 1(19191911181910 12 11191919191910 2007). 1019 19111911 12151614161912 10141212191410 1212181417 19141211 161219101919 1214191914 1919 1011 161217 13121912 1519151211126 1 19191112 191217 1912141214 12 171918191917 1719 1219191415 191612131913 17191711 191112 6 1(191419191014 1379). 10141112151911 19131814 1019171919 11191412 101219 1719 101114191914 1910 151419111910 1011 1913101912 1911141711 191112 1011 1710121910 1419 1915131218 19121917 191212126 1 161912191914191011 6 1(1914191910)6 1 6 1(15121010 12 11191919191910 2006). 1910 1918 1910191017 1912141217126 1 1410 141014191914 191112 6 1(191917101419 1375). 1119 141017 1911 101219 1419 17101319 1919 19111912191410 17191918 191510191412 11151215 101219 1719 161917 10121711 12 1719 19131915 1419121914 1915111210 1914121217126 1 121814 191619171419 101412 1910 19191319 1912191917 1818161211 1419 101918191414 1910 1410 1719 161917111914 121219 12

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