| Autor: |
Omar, Abd Elhamid1, Mazrou, Yasser2,3, Abdelsalam, Mohamed4, Elbadaly, Ibrahim4, Hafez, Yaser5, Abdelaal, Khaled5, Kamara, Mohamed1 |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. Feb2022, Vol. 31 Issue 2, p1828-1837. 10p. |
| Abstrakt: |
The aim of this study was to estimate and compare the genetic gain obtained from Smith-Hazel index model of selection index with direct selection to enhance selection efficiency of superior promising families in early segregating generations of the cotton cross Giza 86 x aust2. The data revealed increase in mean values for all characters with advanced generations' from F2 to F4. The advanced generation (F3 and F4 generations) showed reduction in PCV and GCV values. A significant desirable correlation was existed between boll weight and each of seed/boll, seed index and lint/seed over the three generations. Some relations were changed from negative to positive (desirable direction) over generations. The highest predicted genetic gain from F2 and F3 generations for lint yield/plant was observed when applied index selection contained lint yield/plant with bolls/plant (IW1) followed by (Iwi23) selecting for lint yield/plant, boll/plant with seed/boll and lint/seed, selection index involving lint yield/plant, bolls/plant and lint/seed (Iw13), index selection Iw23 and Iw2. The highest realized genetic gains from F3 generation for lint yield/plant occurred when selecting for IW12 (Selection index involving lint yield/plant, bolls/plant and seeds/boll) followed by Iwi23 (Selection index involving lint yield/plant, bolls/plant, seed/boll and lint/seed. Most indices showed high discrepancy between predicted and actual genetic gain as lint yield/plant and most showed negative values, this was due to non-additive gene effect and large effect of environmental factor. Selection index involving lint yield/plant and boll/plant surpassed all selection procedures for predicted gain. However selection index involving lint yield/plant, bolls/plant, seeds/boll and lint/seed followed by selection index involving lint yield/plant, bolls/plant and lint/seed appeared to be most effective for the improvement lint yield and gives reasonable actual gains. Breeder may utilize selected families in breeding programs aiming to improve yield and quality. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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