Rice germplasm evaluation for agronomic traits and their influence on stem borer (Chilo agamemnon bles.) resistance
2008
El-Malky, M.M. (Rice Research and Training Center (Egypt)) | El-Habashy, M.M. (Rice Research and Training Center (Egypt)) | Abdelkhalik, A.F. (Rice Research and Training Center (Egypt))
A study was conducted at Rice Research Training Centre, Sakha, Kafr AI-Sheikh, Egypt during 2003-2006. Forty-six lines were selected from four populations. These populations were produced from five parents namely; M204, M202 and 98-Y-116 (American varieties) that were used as highly susceptible varieties and two Egyptian (Giza-177 and Sakha-102) as resistant varieties. F1 crosses were conducted at experimental farm of Department of Agronomy and Range Science, University of California, Davis CA95616-8515, USA. The selected lines were evaluated for agronomic traits and stem borer attack. The results revealed that lines expressed considerable range of variation. On the other hand, phenotypic and genotypic variance showed wide differences. Maximum ranges of variation were observed for number of filled grains per panicle followed by white head, grain yield per plant, plant height and maturity days. Heritability ranged from 41.74 for number of panicles per plant to 99.64 for white head. A highly significant positive correlation was found between white head percentage and heading date, plant height and flag leaf area, indicating the importance of these characters for breeding white head resistant varieties. The cluster analysis also confirmed the usefulness of these traits for selecting stem borer resistant lines.
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