科研之友
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摘要
In order to study the reaction of ten hybrids of corn to end-of season drought stress, an experiment was conducted following a randomized complete blocks design with four replications. Five indices of dry endurance were calculated for attribute. In normal condition and tension, Bc678 with 7.45 and 5.48 tons per hectare was in the highest rate of performance. The results showed that GMP (Geometric mean productivity), MP (Mean productivity), STI (Stress tolerance index,) indices were introduced better or superior indices because they could separate group A from other groups. After drawing by plot figure of Bc 404, Bc 678, Golden west genotypes by having the most performances or returns in tension and without tension conditions were placed in group A and identified as endurable genotypes. Also ZP, single cross 704, BC 582, 434 genotypes by having the least performance rate in both tension and without tension conditions were placed in group D and identified as sensitive genotypes. Cluster analysis showed that the genotypes, based on TOL (Tolerance Index), GMP, MP, SSI (Stress susceptibility index), YI (yield index), STI and YSI (Yield stability index), tended to group into three groups with 6, 3 and 1 genotypes, respectively. In this analysis, the third group had the highest MP, GMP, YI and STI, and was thus considered to be the most desirable cluster for both growth conditions. The second group had lower Yield in stress condition values. Therefore, the genotype of this group was considered to be stable in rainfed conditions. In the first group, all of the genotypes had high SSI and TOL, thus they were susceptible to drought and only suitable for irrigated conditions.
- 出版日期2011-11
