Declines in the levels of Cr (69.8 % reduction), Cu (56.9 %), Fe (57.4 %), Mo (78.8 %) and Zn (56.0 %) are observed in ol- der Arabidopsis leaves. Also, studies in pine, soybean and wheat reveal that levels of Cu, Fe and Zn decline in leaves un- dergoing senescence (Mauk and Noodén 1992, Hocking
1994, Nieminen and Helmisaari 1996). However, when certain species are grown in conditions of Cu, Fe, Mo or Zn defi- ciency, the symptoms of this deficiency are most apparent in young tissues (Marschner 1995). This pattern is thought to re- flect the inefficiency with which these nutrients are mobilized from older tissue to young tissue.
Declines in the levels of Cr (69.8 % reduction), Cu (56.9 %), Fe (57.4 %), Mo (78.8 %) and Zn (56.0 %) are observed in ol- der Arabidopsis leaves. Also, studies in pine, soybean and wheat reveal that levels of Cu, Fe and Zn decline in leaves un- dergoing senescence (Mauk and Noodén 1992, Hocking1994, Nieminen and Helmisaari 1996). However, when certain species are grown in conditions of Cu, Fe, Mo or Zn defi- ciency, the symptoms of this deficiency are most apparent in young tissues (Marschner 1995). This pattern is thought to re- flect the inefficiency with which these nutrients are mobilized from older tissue to young tissue.
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