|Title:||落花生型間雜交農藝性狀之遺傳變異||Other Titles:||Genetical Variations of Agronomical Traits in Different Plant Type Crosses of Peanut||Authors:||楊金興
|Keywords:||落花生;型間雜交;遺傳變異;組合力;Peanut (Arachis hypogaea L.);Plant types crosses;Genetic variations;combining ability||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:||299-315||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:||
Six peanut (Arachis hypogaca L.) genotypes, including two of each from Spanish, Valencia, and Virginia types, representing a wide range of genetic diversity, were selected as the parents. A 6 × 6 half-diallel mating design was followed from F1 to F 4 for evaluating the population genetic variability and combining ability of pod and seed traits.
The changes in population genetic variability and combining ability parameters among the i and the resulted subsequent generation and the performances of the parameters of inter- and intra-type crosses were investigated. The population variability of crosses increased from F1 to F4 , and those of intertype were larger than intratype of subspecific crosses. The parents and progenies, F1 to F4 generations, were tested in the spring crops of 1989 and 1992. Experimental results indicated that both general and specific combining abilities (GCA and SCA) were significant in most cases. Furthermore, the GCA effects were higher than SCA effects for all traits in the F to F generations. However, theratios of GCA/SCA were low in the later generations. This suggests that the SCAeffects might bemore importantin advancedgeneration. The GCA effects of the sixparents estimatedfrom theF andfrom the subsequent generations varied. Thisfact indicates that combiningability parameters estimated from theearlygeneration mightnot be effective for predicting the performance in later or subsequent generations. Comparing SCA effects of inter- and intra-type crosses showed that Spaniah type × Virginia type and Valencia type × Virginia type combinations had more positive effecets from F generation, Spanish type × Valencia type combinations had negative effects for most traits from F2 generation. This result suggests that crosses between Spanish or Valencia type with Virginia type peanut were promising combinations for pod and seed traits improvement.
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