The adaptive change of different ploidy wheat materials to density and water conditions were studied under rain-out shelter experiment condition.The results showed that in the evolution of wheat from diploid to tetraploid and hexaploid,yield,grain weight,water use efficiency and harvest index were increased gradually under drought conditions.The maximum yield of different material appear in the medium,low and high-density groups,the yield variance coefficients of different material from 2n to 6n were 6.73%,...
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