Genetic parameters of diallel crosses in bread wheat under normal irrigation and drought conditions [electronic resource].

By: Language: English Summary language: Arabic Description: p.85-107Other title:
  • المعالم الوراثية لهجن الدياليل فى قمح الخبز تحت ظروف الرى العادى والجفاف [Added title page title]
Uniform titles:
  • Egyptian journal of plant breeding, 2011 v. 15 (3) [electronic resource].
Subject(s): Online resources: In: Egyptian Journal of Plant Breeding 2011.v.15(3)Summary: Seven parents of bread wheat were used in a diallel cross without reciprocals in 200812009 season. In 2009/ 2010 season, the 7 parents and their 21 FJ crosses were grown to study heterosis, combining ability and nature of gene action for ten traits under two different water regimes, i.e. normal irrigation (plants gave 5 irrigations during growth season) and water stress (plants gave 3 irrigations where the 2nd and 4th irrigations were prevented during vegetative and an thesis stages, respectively). A field experiment was devoted for each irrigation treatment and laid out in a randomized complete blocks design with three replicates. Mean squares due to parents vs. crosses (average heterosis) were significant for all studied traits under both irrigation treatments as well as their combined data except for spike length and no.. of spikelets/ spike under both water regimes, no. of spikes! plant and grain yield! plant under normal irrigation and 1000-kernel weight under normal irrigation and combined data. The variance due to interaction of parents vs. crosses with irrigation regimes was significant for all studied traits except for spike length, no. of spikelets/ spike and no. of spikes! plant The mean squares due to general (GCA) and specific (SCA) combining ability were significant for all studied traits under each treatment and combined data. The ratios of GCAISCA variances were less than unity under both water regimes and combined data for all studied traits except spike length and no. of spikelets/ spike, indicating that the main genetic variation for these traits was due to non-additive gene action. The two crosses; Giza 168 (P1 x Sakha-94 (P5 and IB18 (P6) x Maryout 5 (P7) was identified as promising for wheat breeding for improving yielding ability under target environments because the parental cultivars and crosses possessed the highest general and specific combining ability effects for grain yield and its contributors. The high expression of heterosis for the two crosses also reflected that the genetic composition of the parents was different with respect to favorable additive genes. All traits were under the control of both additive and non-additive gene effects under the two irrigation regimes. Besides, the dominance gene effects played a major role in the inheritance of most traits. Over dominance and dominant genes were exhibited in most traits under both irrigation regimes. The narrow sense heritability estimates in narrow sense were relatively high to moderate for most traits giving values ranging from 33.74% for plant height to 83.75% for spike length under drought conditions.
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Seven parents of bread wheat were used in a diallel cross without reciprocals in 200812009 season. In 2009/ 2010 season, the 7 parents and their 21 FJ crosses were grown to study heterosis, combining ability and nature of gene action for ten traits under two different water regimes, i.e. normal irrigation (plants gave 5 irrigations during growth season) and water stress (plants gave 3 irrigations where the 2nd and 4th irrigations were prevented during vegetative and an thesis stages, respectively). A field experiment was devoted for each irrigation treatment and laid out in a randomized complete blocks design with three replicates. Mean squares due to parents vs. crosses (average heterosis) were significant for all studied traits under both irrigation treatments as well as their combined data except for spike length and no.. of spikelets/ spike under both water regimes, no. of spikes! plant and grain yield! plant under normal irrigation and 1000-kernel weight under normal irrigation and combined data. The variance due to interaction of parents vs. crosses with irrigation regimes was significant for all studied traits except for spike length, no. of spikelets/ spike and no. of spikes! plant The mean squares due to general (GCA) and specific (SCA) combining ability were significant for all studied traits under each treatment and combined data. The ratios of GCAISCA variances were less than unity under both water regimes and combined data for all studied traits except spike length and no. of spikelets/ spike, indicating that the main genetic variation for these traits was due to non-additive gene action. The two crosses; Giza 168 (P1 x Sakha-94 (P5 and IB18 (P6) x Maryout 5 (P7) was identified as promising for wheat breeding for improving yielding ability under target environments because the parental cultivars and crosses possessed the highest general and specific combining ability effects for grain yield and its contributors. The high expression of heterosis for the two crosses also reflected that the genetic composition of the parents was different with respect to favorable additive genes. All traits were under the control of both additive and non-additive gene effects under the two irrigation regimes. Besides, the dominance gene effects played a major role in the inheritance of most traits. Over dominance and dominant genes were exhibited in most traits under both irrigation regimes. The narrow sense heritability estimates in narrow sense were relatively high to moderate for most traits giving values ranging from 33.74% for plant height to 83.75% for spike length under drought conditions.

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