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seed and plant improvement institute (SPII)
Abstract:   (36 Views)

Development of hybrid genotypes and high yielded varieties is important to balance between food production and human population. in order to genetic analysis of yield and some important traits in oilseed rape (Brassica napus L.), we conducted line×tester analysis with ten lines and ten cold resistance testers (three winter parents and seven spring parents). First generation hybrids accompanied with 20 parents (120 genotypes) were cultivated in alpha lattice design with two replications under two different conditions (normal and delayed planting date) and days number to flowering, flowering duration, plant height, number of primary branchs in plant, thousand seed weight and yield are studied. The results showed that the difference between genotypes is significant and the environment had a different effect on genotypes. High levels of broad sense heritability (from 73.65% for number of primary branches in plant to 87.65% for grain yield) showed that the genetic variance is more than environmental effect. estimation of less than unit for  the mean square of the general combining ability to the mean square of thespecific combining ability ratio and low to moderate value of narrow sense heritability (from 29% for plant height to 70% for grain yield) showed that non-additive variance is major factor in control of studied traits. The spscific combining ability of hybrids and heterobiltiosis estimation showed that introduced hybrids in this study could be used in breeding programs and improve the oilseed rape characters. The T9 × L2, T3 × L2, T3 × L9 and T3 × L5 hybrids in normal condition and T3 × L5, T7 × L6, T5 × L10 and T7 × L7 in delayed planting conditions with maximum heterosis for yield were potential hybrids for using in breeding programs to increase the yield.

Type of Study: Research | Subject: General

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