Abstract
Abstract In vitro propagated plums of St. Julien GF 655–2 [Prunus insititia (L.)] (655–2), Damas GF 1869 [Prunus domestica (L.)] (D1869), and Clark Hill Redleaf [Prunus salicina (Until.) X Prunus cerasifera (Ehrh.)] (CHR), were grown in the greenhouse in nutrient solutions of 2, 6, 22, 66, 202, and 404 μM Ca for 96 days. 655–2 plants became severely chlorotic in Ca treatments of 66, 202, and 404 μM concentration after 86 days of growth. D1869 plants in 202 and 404 μM Ca exhibited slight interveinal chlorosis of new growth, while CHR exhibited no chlorosis at any Ca concentration. The best tissue nutrient indicator of chlorosis among rootstocks was foliar P/Fe and P/Zn ratios. 655–2 plants absorbed more P at higher Ca concentrations than did the other rootstock, resulting in the highest stem and leaf P/Fe, and P/Zn ratios. CHR plum may provide an easily propagated, chlorosis‐resistant rootstock for use on calcareous soils.
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