THE VARIATION OF PHYTIC AND INORGANIC PHOSPHORUS IN LEAVES AND GRAIN IN MAIZE POPULATIONS

Dragicevic V., D. Kovacevic, S. Sredojevic, Z. Dumanovic and S. Mladenovic Drinic (2010): The variation of phytic and inorganic phosphorus in leaves and grain in maize populations - Genetika, Vol 42, No. 3, 555 -563. The phytate function in plants is still not completely understood: it is the primary storage P form in seeds that is utilized during germination and early seedling development. Approaches to resolve problem of the bad nutritive quality of grain phytate include engineering of crops with reduced levels of seed phytic acid. The objective of this study was to investigate genetic variability and correlation of phytic (P-phy) and inorganic phosphorus (P-i) and soluble proteins among 28 maize populations, consisted into three groups: low-, intermediate-and high-phytic populations, with the aim to determine the potential of enhancing the P profile of maize plants and high grain yield through selection. The highest genetic variability of P-i and P-phy content in leaves was expressed in group with intermediate P-phy content in grain. Meanwhile, leaves of low-phytic populations were characterized with low P-phy, too (averagely 18%) and high content of soluble proteins (averagely 15%) in relation to high-and intermediate-phytic populations. Additionally, the lowest genetic variability of protein content was also noticeable in leaves of low-phytic populations. Positive correlation between P-i and protein content was observed in leaves of low-and high-phytic populations. The negative correlation between P-phy and P-i was detected in maize grain, but correlation was significant only in intermediate-phytic group. The highest, but not significant, average yield was observed in group of low-phytic populations, as well as its relative high genetic variability. That indicates that development of high yielding genotypes with lower phytate in grain is reasonable, and could be potentially useful in enhancing the sustainability and decreasing of environmental impact in agricultural production.