Abstract
Under low phosphorus (P) availability, plants change their root physiology and release more protons and carboxylates to
acquire P from residual sources. This ability differs among genotypes. In this situation, P efficient genotypes may be a
conceivable way of decreasing the P demand and using applied P efficiently. This study was planned with the objective of
screening P efficient wheat and maize genotypes on the basis of carboxylate and proton release under P deficient condition.
Five genotypes each of wheat and maize were grown in solution culture with normal and deficient P treatments under CRD
(completely randomized design) factorial. At harvest carboxylates, proton and P were analyzed. Results revealed that wheat
genotype, SARC-1 and maize genotype, Pioneer-32F10 was better in carboxylate exudation and more release of carboxylates
and proton was recorded in these genotypes comparative to other genotypes. Both genotypes also showed better P and
phosphorus use efficiency in P deficient treatment compared to normal P treatment. In the case of species, maize roots released
more fraction of malate and wheat roots released more fraction of citrate. This genetic difference can be used for the selection
of P efficient genotypes for P deficient soils through the breeding process in the future.
Shazia Iqbal, Javaid Akhtar, Zulfiqar Ahmad Saqib, Rashid Ahmad. (2020) GENOTYPIC AND SPECIES VARIABILITY IN CARBOXYLATE EXUDATION OF WHEAT (Triticum aestivum L.) AND MAIZE (Zea mays L.) IN PHOSPHORUS DEFICIENCY, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 3.
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