الفهرس 
Review of LiteratureOnly 14 pages are availabe for public view
 |  | from | 114 |  |  |
| | | from | 114 | | |
Abstract
This investigation was carried out at Sohag Governorate, as one -#102;-#114;-#111;-#109; series of the co-operation works between Faculty of Agric., Sohag University, Sohag, Egypt and Horticulture Res. Institute, Agric. Res.Centre, Giza, Egypt, during the winter seasons of 2010/2011, 2011/2012 and 2012/2013 . br The objective of this study was to estimate the response of individual plants to selec-#116;ion (i.e. pedigree selec-#116;ion) in some pea (Pisum sativum L.) crosses. br Two F2 populations of garden pea (On word x Jaguar and Lincoln x Early perfection) were used in this study as the main genetic material in addition to check cultivar (Entsar2). br Estimating the actual response to selec-#116;ion and the expected genetic gain through selec-#116;ion technique has been used. Also, study the genetic variability and broad sense heritability for some economic -#99;-#104;-#97;-#114;acters (number of days to flowering, plant height, number of branches / plant, pod length, pod diameter, number of seeds/pod, number of pods/plant, green pod yield/plant, average 100-seeds weight and seed dry yield/feddan) were done. Results showed that all studied traits means increased by selec-#116;ion. Also, the large portion of phenotypic variance (σ2p) was due to the genetic variance (σ2g) and estimated broad-sense heritability showed high values in most traits indicating that these -#99;-#104;-#97;-#114;acters can be improved through selec-#116;ion based on phenotypic observations in early segregating generations in garden pea. br Family No. 14 of population I was the earliest by 36.07, 30.36 and 30.29%, followed by both Families No. 5 - No. 10 by 32.79, 26.79 and 26.72 % as well as family No. 12 earlier by 32.30, 26.25 and 26.18% than check cultivar, earliest parent and mid-parent, respectively. br For population II, all the fifteen selec-#116;ed families were significantly earlier than check cultivar, earliest parent and mid-parent. Family No.4 was the most earlier genotype (18.52, 21.11 and 22.34%), followed by family No. 6 (18.03, 20.63 and 21.88%), than check cultivar, earliest parent and mid-parent, respectively. br Eight families out of the fifteen selec-#116;ed families of population I, after the second cycle, viz., 3, 7, 14, 11, 2, 1, 10 and 13, in green pod yield/ plant, exceeded significantly population mean, the highest parent and/ or check cultivar. Family No. 3 was significantly higher in green pod yield/ plant by 98.91, 78.43 and 91.58% than the check cultivar, the best parent and mid-parent, respectively br All the selec-#116;ed pop. II families were superior, in green pod yield/ plant, to the best parent except No. 4 and 6. On the other hand, the family No.1 gave the heavy yield, followed by No. 15, No. 2, No. 14 and No. 13 which exceeded the check cultivar by 102.19, 78.86, 74.54, 67.21 and 45.36%, respectively. Therefore, it could be useful for isolating heavy yielding genotypes and/or as a source to improve yielding ability for well adapted cultivars. br In population I after two cycles, the selec-#116;ion gave family No. 7 which out-yielded (in seed yield) the check cultivar, the best parent and mid-parent by 33.55, 33.55 and 46.9 %, respectively, followed by family No. 3 by 28.09, 28.09 and 40.9%, respectively. br In population II, the direct selec-#116;ion for seed yield resulted in two high yielding families No. 1 and 15. Family No. 1 yielded 67.36, 62.92 and 102.53% more than the check cultivar, the best parent and mid-parent, respectively. In addition, all selec-#116;ed families in population II except No.5 significantly out-yielded the check cultivar and/or the highest parent. br Pedigree selec-#116;ion in both I and II populations increased the correlation between green pod yield/feddan and each of No. of pods/plant, weight of green pods/plant, pod length, No. of seeds/pod, dry seed yield/plant, 100-seed weight and plant height. This means that the early families were high in green yield and its attributes, and vice versa. br Also, Pedigree selec-#116;ion in both I and II populations increased the correlation between dry seed yield/feddan and each of the abovementioned traits.