Vol. 77 No: 3

Title:
Phosphorus supply influences the molybdenum, nitrate and nitrate reductase activity in eggplant

Authors:
G. VILLORA, D.A. MORENO and L. ROMERO

pp: 305-309

Abstract:
Greenhouse experiments were conducted for two years (1993-1994) with eggplants being supplied H₃PO₄ as the P source (1.mM, 2.mM and 4.mM) to study its influence on Mo distribution and on aspects of nitrate metabolism and fruit quality. The NO₃ and Mo in leaf blades, petioles and fruits as well as foliar in vivo nitrate reductase (NR; E.C. 1.6.6.1) activity were analysed. P application at levels exceeding 1.mM P altered the NO₃ and Mo status and distribution in the above-ground organs of eggplant. The 4.mM P treatment induced the highest NO₃ accumulation in leaf blades and lowered transport to the fruits. Moreover, lower P (1 and 2.mM) supplies led to increased NO₃ concentration in fruits. The 4.mM P treatment induced a greater Mo concentration in the fruit, whereas the soluble form of Mo was nearly equally distributed between the shoot organs.

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