The F 1 and F 4 plants of 'synthetic hexaploid wheat/common wheat'crosses and part of their parents were inoculated with Fusarium graminearum to evaluate FHB resistance.The results showed tht the scab resist...The F 1 and F 4 plants of 'synthetic hexaploid wheat/common wheat'crosses and part of their parents were inoculated with Fusarium graminearum to evaluate FHB resistance.The results showed tht the scab resistance in the F 1 varied with the synthetic wheat accessions used as crossing parents.In the F 4,some resistant head lines were generated from the crosses,although their parents had different scab resistance levels.It indicated that synthetic hexaploid wheat are useful in wheat breeding for scab resistance.展开更多
Yield characters, maturity and grain protein content of somaclones derived both from immature embryo of cultivar 77(2)-Spring and single-cell culture of cultivar NE7742 in vitro were studied and the wide variation was...Yield characters, maturity and grain protein content of somaclones derived both from immature embryo of cultivar 77(2)-Spring and single-cell culture of cultivar NE7742 in vitro were studied and the wide variation was found. Somaclones with maturity 8 days earlier than or the same as CK NE 7742 (high yield, early maturity and high quality), combining with high quality (grain protein content 15.5% - 18%) and high yield (the same as 7724 or higher) have been found and selected and now multiplied for 8 generations. The results of cultivar comparison trial in 1995 showed that several somaclones (the yields were significantly higher than CK DN120) could be used directly in wheat production. The studies confirmed that somaclonal variation is one of the effective ways for early maturity, high-yielding and high-quality improvement in wheat.展开更多
为了解十倍体长穗偃麦草5Ag染色体在不同小麦背景中的遗传稳定性及其在配子中的传递,本研究利用小麦-十倍体长穗偃麦草二体代换系DS5Ag(5D),即百农普偃5814(PY5814),与6个小麦品种(系)中国春、百农矮抗58、兰考矮早8、温麦6号、周麦16以...为了解十倍体长穗偃麦草5Ag染色体在不同小麦背景中的遗传稳定性及其在配子中的传递,本研究利用小麦-十倍体长穗偃麦草二体代换系DS5Ag(5D),即百农普偃5814(PY5814),与6个小麦品种(系)中国春、百农矮抗58、兰考矮早8、温麦6号、周麦16以及Q03073进行杂交,杂种F1自交,并分别与上述6个品种(系)进行正反交,利用分子标记技术对F2和BC1F1代进行鉴定。结果表明,PY5814与6个不同小麦品种(系)杂交获得的F1均能够正常结实;在不同组合的F2分离群体中,5Ag染色体传递率范围为51.61%~71.76%,表明5Ag染色体在不同小麦背景中的遗传率不同,传递受小麦背景的影响。在BC1F1群体中,5Ag染色体通过雌配子和雄配子的传递率范围分别为21.43%~31.73%和29.51%~39.73%,表明5Ag染色体可以通过雌、雄配子传递;在兰考矮早8和温麦6号背景下,其通过雄配子的传递率高于通过雌配子的传递率,表明其在遗传研究中适合做父本。同时利用基因组荧光原位杂交(GISH,genomic in situ hybridization)技术对部分F2材料进行了验证,其结果与分子标记结果一致。本研究还为构建适宜杂交群体规模的预测,从而在后代中有效筛选出携带5Ag染色体的目标单株提供了理论指导。展开更多
文摘The F 1 and F 4 plants of 'synthetic hexaploid wheat/common wheat'crosses and part of their parents were inoculated with Fusarium graminearum to evaluate FHB resistance.The results showed tht the scab resistance in the F 1 varied with the synthetic wheat accessions used as crossing parents.In the F 4,some resistant head lines were generated from the crosses,although their parents had different scab resistance levels.It indicated that synthetic hexaploid wheat are useful in wheat breeding for scab resistance.
文摘Yield characters, maturity and grain protein content of somaclones derived both from immature embryo of cultivar 77(2)-Spring and single-cell culture of cultivar NE7742 in vitro were studied and the wide variation was found. Somaclones with maturity 8 days earlier than or the same as CK NE 7742 (high yield, early maturity and high quality), combining with high quality (grain protein content 15.5% - 18%) and high yield (the same as 7724 or higher) have been found and selected and now multiplied for 8 generations. The results of cultivar comparison trial in 1995 showed that several somaclones (the yields were significantly higher than CK DN120) could be used directly in wheat production. The studies confirmed that somaclonal variation is one of the effective ways for early maturity, high-yielding and high-quality improvement in wheat.
文摘为了解十倍体长穗偃麦草5Ag染色体在不同小麦背景中的遗传稳定性及其在配子中的传递,本研究利用小麦-十倍体长穗偃麦草二体代换系DS5Ag(5D),即百农普偃5814(PY5814),与6个小麦品种(系)中国春、百农矮抗58、兰考矮早8、温麦6号、周麦16以及Q03073进行杂交,杂种F1自交,并分别与上述6个品种(系)进行正反交,利用分子标记技术对F2和BC1F1代进行鉴定。结果表明,PY5814与6个不同小麦品种(系)杂交获得的F1均能够正常结实;在不同组合的F2分离群体中,5Ag染色体传递率范围为51.61%~71.76%,表明5Ag染色体在不同小麦背景中的遗传率不同,传递受小麦背景的影响。在BC1F1群体中,5Ag染色体通过雌配子和雄配子的传递率范围分别为21.43%~31.73%和29.51%~39.73%,表明5Ag染色体可以通过雌、雄配子传递;在兰考矮早8和温麦6号背景下,其通过雄配子的传递率高于通过雌配子的传递率,表明其在遗传研究中适合做父本。同时利用基因组荧光原位杂交(GISH,genomic in situ hybridization)技术对部分F2材料进行了验证,其结果与分子标记结果一致。本研究还为构建适宜杂交群体规模的预测,从而在后代中有效筛选出携带5Ag染色体的目标单株提供了理论指导。
