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本试验以7个南瓜砧木品种为材料,通过调查土壤根际根结线虫数、砧木与接穗的亲和力和接穗黄瓜产量,进行品种比较。结果表明,土壤根际根结线虫数差异显著,砧木247、242、229的土壤根际根结线虫数少,219和221次之,CK和北京砧木多;砧木与接穗的亲和力也存在显著差异,242、229、247和CK较强,北京砧木、221和219较差;单株接穗黄瓜产量和结瓜数以242、247和229最高,北京砧木和221次之,CK与219最低。参试7个品种中,242、247、229综合性状表现良好,抗病性、砧木与接穗的亲和性以及单株产量均优于对照,可以作为黄瓜抗根结线虫砧木在栽培中推广应用。 相似文献
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以3个品种砧木南瓜种子为试材,采用水培法研究了Ca~(2+)胁迫对种子萌发特性和芽苗生长的影响,以确定适合砧木南瓜耐盐性评价的指标,并筛选出适宜的Ca~(2+)浓度。结果表明:随着胁迫浓度的增加,Ca~(2+)对种子萌发的抑制作用明显增强;主根长、侧根数、下胚轴长及平均鲜重受抑制程度远高于发芽率、发芽势及发芽指数的受抑制程度。综合分析,除主根长外,其余指标均可作为耐盐性评价指标;砧木南瓜种子萌发期各指标和活力指数耐盐性筛选的适宜Ca~(2+)浓度为90~120 mmol/L,芽苗期各指标除主根长外,耐盐性筛选的适宜Ca~(2+)浓度为60 mmol/L。 相似文献
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Ginger (Zingiber officinale Roscoe) is an important economic crop in China. Bacterial leaf spot disease is the major limiting factor for the ginger crop production in Shandong. In recent years, a bacterial leaf spot disease was observed on ginger in Laiwu and Anqiu, that became a major limiting factor in ginger production. Yellowish bacterial colonies that were obtained after incubation at 28°C for 2 days from infected leaves were purified by streaking on nutrient agar. The purified isolates were initially identified as Pantoea ananatis by the phenotypic and biochemical characterization. Further molecular identification based on the 16S rDNA sequence analysis and multilocus sequence analysis with the gyrB, rpoB, and atpD sequences confirmed that the isolates were P. ananatis. To our knowledge, this is the first report of bacterial leaf spot of ginger caused by P. ananatis in Shandong. Our study will provide basic references for disease management of this pathogen. 相似文献
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