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ที่มา:Maydicaหัวเรื่อง:Screening of phytic acid and inorganic phosphorus contents in corn inbred lines and F1 hybrids in tropical environment |
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Development of Semi-exotic Maize (Zea mays L.) Inbred Lines: Performance per se and in Hybrid Combinations) ผู้เขียน: Putu Darsana,  ดร.กฤษฎา สัมพันธารักษ์, ศาสตราจารย์ , เอนก ศิลปพันธุ์ สื่อสิ่งพิมพ์:pdf AbstractTo create positive transgressive segregation of quantitatively inherited traits such as yield of inbred lines, two or more sources which accumulate different classes of favorable alleles are required. Introgression of exotic germplasm into tropical inbred line is one of several possible methods. This study was conducted to asses a potential use of exotic germplasm introduced from different latitudes to improve tropical inbred lines and their performance in hybrid combinations. The results of the present study indicated that all improved exotic germplasm were equally useful as sources of desirable alleles, especially for high yield of semi-exotic inbred lines. The 25 % semi-exotic inbred lines showed earlier days to anthesis and silking, lower grain moisture content, but higher leaf disease infection than the 12.5 % semi-exotic inbred lines. Transgressive segregation of semi-exotic inbred lines was also found in each class of exotic germplasm. Testcross hybrids generated from crossing between tropical testers with 12.5 % exotic inbred lines showed higher yield, earlier maturity, and better disease resistance than the testcross hybrids of 25 % exotic inbred lines. Result of the present study suggested that combining ability of recurrent parent and the tester as well as proportion of exotic alleles in the converted semi-exotic lines are very importance for a success of semi-exotic inbred lines in hybrid combinations. |
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ที่มา:การประชุมทางวิชาการของมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 47หัวเรื่อง:การประเมินสายพันธุ์ผสมตัวเองชั่วที่ 2 ที่พัฒนาจากข้าวโพดหวานพันธุ์ KSC3(HI)C2 โดยการผสมกับตัวทดสอบที่เป็นสายพันธุ์แท้ |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Development of Sweet Corn Inbred Lines by Family Selection under Different Competition Environments) ผู้เขียน:Nguyen TIEN TRUONG, ดร.กฤษฎา สัมพันธารักษ์, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractSweet corn (Zea mays L.) breeding has focused on quality and agronomic traits with yield performance as second priority trait. The objective of the present study was to compare yield and to combine ability of sweet corn inbred lines selected from 3 original single crossed under different competition environments; firstly, under high plant density (0.75 ? 0.25 m); secondly, under low – competition spacing (0.866 m) in non – replicated honeycomb design; and thirdly, by alternate selection between the first 2 methods. The resulted 9 S3 family lines from each original hybrids were grouped into three line groups, totaling of 9 groups. Diallel cross was performed within each group, resulting in 27 intra – family hybrids. Simultaneously, they were crossed to a single cross, Insee2 to form 27 testcross hybrids. The results of the study showed that sweet corn inbred lines derived from selection under low – competition environment by honeycomb selection had not only higher yield but also higher combining ability compared with inbred lines derived from selection under high plant density environment and alternate selection between the first two methods. However, different sources of germplasm responded differently to the common tester. |
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