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| Studying Relationships among Yield and Yield Traits in Mexican Wheat Genotypes |
Shamshad Ali Sheedi, Rehmatullah Baloch, Irfan Qadir,Dad Muhammad,Niaz Muhammad Jamali, Abdul Nabi Domki.Mitha khan
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Abstract:
A field study was carried out during 2018-19 to assess relationships among yield and yield traits in 15 Mexican wheat genotypes; and the breeding material comprised of Mexican Line 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 and 35. In addition to recording the growth and yield performance, ANOVA, correlation coefficient and regression analysis were also performed to examine the contribution of different traits in grain yield variability. RCB design with three replicates was used for the experiment. The mean squares from the ANOVA have suggested significant difference in their growth and yield traits (P<0.05) from each other. The significance of differences in the values of studied traits of Mexican wheat lines might be the genetic influence corresponding to genetic makeup of parental material of these wheat lines. The Mexican lines used as breeding material produced significantly different yield performance (P<0.05). Mexican Line-25 produced maximum yield performance, followed by Mexican Line-28, Mexican line-32, Mexican line-29 and lowest yield plant-1 was recorded in Mexican line-23. The Mexican Line-25 showed its superiority in plant height, tillering capacity, seeds spike-1 as well as in grain yield plant-1. Mexican Line-28 and Mexican Line-32 also showed most promising results for grain yield plant-1. There was significant and positive (P<0.05) correlation for tillering capacity plant-1 vs grains number spike-1 (r=0.3241*), tillers number plant-1 vs yield plant-1 (r= 0.6223**), spike length vs seed index (r= 0.3692**), spike length vs grains spike-1 (r=0.3291*) and spikelets spike-1 vs grains spike-1 (r= 0.3642**). However, there was negative and significant (P<0.05) association was recorded for plant height vs spike length (r= -0.3951**), plant height vs seed index (r= -0.6428**) and tillers plant-1 vs spike length (r= -0.3585**). The coefficient of determination (r2) suggested 2.18% decrease in grain yield with increasing plant height; and 37.30 percent increase in grain yield was described by increase in tillers plant-1; while 1.73% variation in grain yield was linked with spike length variation. Similarly, 3.50% variation in grain yield was guided by the variation in spikelets spike-1 and 0.63 percent variation in yield was guided by change in grains spike-1; while 2.97% change in grain yield was associated with the change in seed index.
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