During the major onset of downy mildew,The PPO and POD activities in leaves were determined in three grapevine varieties(lines),8804,Merlot and Cabernet Franc..It was shown that the PPO and POD activities kept higher for a longer time with variety 8804 and lower with Merlot and Cabernet Franc.;the PPO activity of 8804 varied more widely after P.Viticola inoculation than those of the other two varieties.The POD activities of 8840 were less changed comparied to the others.The PPO and POD activities in leaves ...
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