Abstract: The commonly grown eggplant ( Solanum melongena L. ) cultivar Xipan Lüqie was used as scion. It was grafted with a wild eggplant rootstock ( Solanum torvum ). Dynamic characteristics in microbe physiological groups, hydrolase activity in rhizopheric soil and nitrate reductase (NR ) activity of grafted eggplant leaves were studied. The relationships between microbial physiological groups, hydrolase activity in rhizopheric soil and leaves nitrate reductase (NR) activity were indicated. The relationship between nitrogen absorption and soil biological activities of grafted eggplants was discussed. Results showed that rhizopheric soil microbical physiological groups and hydrolase activity in grafted eggplants were higher in grafted eggplants than in self-rooted eggplants. However, these trends changed with different plant ages. The Leaves NR activity was increased with the plants ages and significant higher in grafted eggplants than in self-rooted eggplants. There were significant positive correlations between azotobacteria, nitrifying bacteria and urease activity in grafted eggplants. In conclusion, grafting increased the numbers of azotobacteria and nitrifying bacteria, urease activity in rhizopheric soil and NR in eggplant leaves.

Key words: grafting, eggplants, NR, rhizospheric microbia, soil enzyme