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首页> 外文会议>International Society of Sugar Cane Technologists Congress vol.2; 20050130-0204; Guatemala City(GT) >BREEDING SUGARCANE FOR LEAF SCALD RESISTANCE: A GENETIC STUDY
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BREEDING SUGARCANE FOR LEAF SCALD RESISTANCE: A GENETIC STUDY

机译：育种甘蔗叶抗鳞屑病的遗传研究

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摘要

Six sugarcane genotypes were combined in 15 biparental crosses, following a balanced diallel type II design. The objective was to obtain a better understanding of the genetic variance of sugarcane resistance to leaf scald (LS). The progeny, and the parental clones, were evaluated in a randomised block design with three replications of seventy plants per plot. Plots were inoculated with LS when harvested in plant cane and the ratoon was evaluated for symptoms. Results show a high broad sense heritability (h~2_b = 0.98) and moderate narrow sense heritability (h~2_n = 0.57). Analysis of the genetic variance showed significant general combining ability (GCA) as well as specific combining ability (SCA). The cultivars SP80-185, SP80-1520, and TCP86-3361 showed highest GCA values while the cross SP80-185 x SP81-3386 showed the highest SCA value. The use of LS-susceptible parents that possess other favourable traits in sugarcane breeding programs cannot be ruled out. The SCA demonstrated by some parental combinations means that some resistant seedlings might be obtained from crosses with susceptible parents.
机译：按照平衡的II型拨号设计，在15个双亲杂交中组合了六种甘蔗基因型。目的是为了更好地理解甘蔗对叶片烫伤（LS）抗性的遗传变异。在随机区组设计中评估后代和亲本克隆，每块地重复七十株植物。当在植物甘蔗中收获时，用LS接种地块，并评估宿根的症状。结果显示出较高的广义遗传力（h〜2_b = 0.98）和中等的狭义遗传力（h〜2_n = 0.57）。遗传变异分析显示显着的一般结合能力（GCA）和特异性结合能力（SCA）。品种SP80-185，SP80-1520和TCP86-3361显示出最高的GCA值，而杂交SP80-185 x SP81-3386显示出最高的SCA值。不能排除在甘蔗育种计划中使用具有其他有利性状的对LS易感的父母。通过一些亲本组合证明的SCA意味着可以从易感亲本杂交获得一些抗性幼苗。

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