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Abstract
Peach rootstocks Lovell, GF677, Siberian‐C and Nemaguard were grown for Fe efficiency evaluation under high nutrient solution pH. Various techniques were employed to assess the Fe status of plants. Total leaf and 2% acetic acid extracted Fe concentration were not able to distinguish between chlorotic and non‐chlorotic leaves. O‐Phenanthroline extraction does not seem to be sufficiently sensitive to distinguish between moderately chlorotic and green leaves. Xylem sap Fe concentration did not correspond with the leaf Fe concentration of the same rootstock which indicates its non‐suitability for the assessment of Fe translocation ability of rootstocks. P/Fe and K/Ca ratios were not found to be good indicators of Fe deficiency. Leaf chlorophyll content increased as the Fe concentration in the nutrient solution increased. Leaf chlorophyll content was a reliable criterion for assesssing the active Fe status of the plants. On the basis of the correlation between leaf chlorophyll content and Fe treatment level, GF677 plants were not chlorotic at the high pH conditions. Lovell plants were able to withstand moderate alkaline conditions without having any Fe chlorosis problem. Siberian‐C and Nemaguard plant leaves were low in chlorophyll, and therefore would not be suitable rootstocks under high pH conditions.
Notes
A contribution of the Georgia Agricultural Experiment Station, College Station, Athens, This research was supported by State and Hatch funds awarded to the Georgia Agricultural Experiment Station, College Station, Athens and by grant no. CCA‐8510/076 awarded by the U.S.‐Spain Joint Committee for Scientific and Technological Corporation.
Scientific Officer, Fruit Crops Research Program, National Agricultural Research Center, IslamAbad, Pakistan
