GENETIC BEHAVIOR FOR SOME ROOT CHARACTERS AND THEIR RELATION TO, SOME YIELD OTHER CHARACTERS UNDER DROUGHT CONDITION IN RICE (Oryza sativa L.) | ||||
| Journal of Plant Production | ||||
| Article 9, Volume 34, Issue 2, February 2009, Page 1153-1172 PDF (860.81 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2009.116652 | ||||
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| Authors | ||||
| A. S. M. Abd El-Lattef1; A. A. Mady2 | ||||
| 1Rice Res. Section Field Crop Res. Inst. Agr., Res., Cent. Sakha, Kafr El-Sheikh, Egypt | ||||
| 2Water Management and Irrigation Systems Research Institute, NWRC, Cairo, Egypt. | ||||
| Abstract | ||||
| This investigation was caried out during three successive seasons 2006, 2007 and 2008 at Rice Research and TrainingCenter, (RRTC) Sakha, Kafr El-sheikh, Egypt. Six rice genotypes with different drought tolerance were crossed to produce three crosses namely, RD23 (tolerant) X Sakha 102 (sensitive) cross I, BG35 (tolerant) X Giza 177 (moderate) cross II and Cica 4 (moderate) X Sakha 103 (sensitive) cross III. Six populations P1, P2, F1, BC1, BC2, and F2 for each cross were utilized in this investigation. The results indicated that high differences between the six parents for most of studied characters were determined. The rice variety RD 23 owned the highest mean values for most of all studied traits, while the lowest mean values were recorded for rice variety Sakha 103. Highly significant positive heterosis and heterobeltiosis were estimated for root characters. The best useful heterosis was recorded in crosses I and II for most studied characters. Over-dominance played an important role in the inheritance of root length, root number, root volume and root fresh weight in cross I. On the other hand, the negative over dominance values were recorded for root fresh weight in cross III and root / shoot ratio in cross II. Low and positive inbreeding depression values were estimated in the last two crosses, while moderate estimates were found in the first cross. Epistatic gene effect had a significant contribution of inheritance in most studied characters. The additive X additive gene interaction appears to contribute more than any other sources of epitasis. Additive genetic variance was greater than the dominance genetic variance for root fresh weight and no. of days to 50% heading, in cross III, root / shoot ratio in crosses I and II. Heritability in broad sense was ranged from low to high in the three studied crosses. While narrow sense heritability was moderate to low. The highest value of heritability estimates (58.54) was recorded for root length in cross II, Moderate to high values of predicted genetic advance were estimated for all studied crosses, these values 30.21 for root dry weight in cross II. Significant or highly significant positive phenotypic correlation were found between most of all studied characters in the three studied crosses specially between root characters and grain yield / plant under drought condition. The most desirable genotypes for root, yield and its related of studied characters were the parents, RD 23 and BG 35 and their crosses, proving to be useful genotypes in breeding program for drought tolerance. Concerning water saving, The results showed that the highest crop water use efficiency were 0.66 and 0.62 kg / m3 recorded from 1 m3flashing water irrigation in cross I (RD23 x Sakha 102) and cross II (BG35 X Giza 177). Therefore these crosses could be recommended to be grown under drought condition to obtain the highest rice grain yield Kg/m3 and highest value of save water in the same time. | ||||
| Keywords | ||||
| Rice; root characters; grain yield; heterosis; heritability; inbreeding depression; genetic advance | ||||
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