|Title:||高梁基礎族群之遺傳研究||Other Titles:||Genetic Studies on Base Population of Sorghum||Authors:||陳成
|Keywords:||蜀黍;基礎族群;細胞質雄不稔性;遺傳率;遺傳變方;表型相關;單籽後裔法;Sorghum;Base population;Cytoplasmic male sterility;Heritability;Genetic variance;Phenotypic correlation;Single seed descent method||Issue Date:||May-1995||Publisher:||農業試驗所||Related Publication(s):||農業試驗所特刊第49號||Start page/Pages:||135-165||Source:||雜糧作物生產技術改進研討會專刊||Conference:||雜糧作物生產技術改進研討會||Abstract:||
To develop a set of germplasm in order to improve plants of sorghum, nine elite cytoplasmic male sterile lines as female parents and eleven superior F1 hybrids as male parents were made cross in this experiment. Equal amount of seeds from each cross were bulked and carried out random- mating in Taipei (TP) and Taichung (TC). The filial random-mating populations derived from the random-mating were planted in Taipei for further experimental research and made random-mating once more. Finally, the base population was developed sucessfully and had broad genetic variation and suitable growth in Taiwan. Fifty half-sib (progeny of open-pollinated male
-sterile plants) and S1 (progeny of unbaggedmale- fertile plants) families were randomly chosen from the base population. Genetic variability of agronomic characters were estimated. All of the agronomic characters did not exit inbreeding depression in this experiment, indicating they were all due to additive genetic action. Plant height had the highest estimation of coefficient of variation value. The estimation of additive variance was greater than non-additive variance for all traits in the experiment, therefore it is better to use recurrent selection for population improvement. Heritabilities for S families (broad sense) were slightly higher than for half-sib families (narrow sense) by using parent- offspring regression and standard unit methods. Positive correlation were found between days to flower and leaf number, stalk diameter and leaf or green leaf number, panicle weight and plant height or green leaf number, while that of between plant height and stalk diameter, was negative. Survival rate and SSD succeed rate for 5 X 5 cm density were two-fold larger than that of 3.5 X 3.5 cm. Nine sub-populations selected for different agronomic characters were planted under environment of 5 X 5 cm density without fertilizer application. Survival rate and SSD succeed rate were higher for high-plant and medium-highplant sub-populations selected for plant height. Survival rate and SSD succeed rate in the block without previous crops were higher than that in the block with previous crops of sorghum or corn. This experiment indicated that the SSD succeedrate could be higher if one can control the supplement of nutrition.
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