Abstract ‘Candidatus Liberibacter solanacearum’ (Lso), which is transmitted by the potato psyllid (Bactericera cockerelli), is the putative causal agent of potato zebra chip. Two haplotypes of the bacterial agent (A & B) are currently widely detected in US potato production regions. This study was aimed at determining the relative impacts of the two haplotypes on plant emergence and agronomic characteristics of emerged plants. Greenhouse experiments were conducted using tubers infected with known haplotypes (A, B or AB mix), collected from two separate locations. Collected tubers were planted in replicated pots and plant emergence was monitored daily. Thirty-five days after planting, emerged plants were harvested and individual plant biomass, height, stem diameter, and leaf area were determined. For both locations, tubers infected with Lso B had lower plant emergence compared to uninfected controls. However, there was no difference in plant emergence between tubers infected with Lso A and Lso B. Emergence of plants from tubers infected with Lso B was slower compared to that of uninfected tubers but there was no difference in time of plant emergence between tubers infected with Lso A and the uninfected controls. Biomass of plants which emerged from uninfected tubers was greater than that from all Lso-infected tubers, regardless of haplotype, and plants which emerged from tubers infected with Lso A had greater biomass than those from tubers infected with Lso B. Differences in height, stem diameter, and leaf area among emerged plants followed similar patterns for both locations (uninfected control the highest and Lso B the lowest) except those from tubers infected with AB, which were inconsistent.

中文翻译：

---

'Candidatus Liberibacter solanacearum' 单倍型对受感染种子块茎萌芽和生长的影响

摘要 'Candidatus Liberibacter solanacearum' (Lso) 由马铃薯木虱(Bactericera cockerelli) 传播，是马铃薯斑马片的假定病原体。目前在美国马铃薯生产区广泛检测到两种单倍型细菌剂（A 和 B）。本研究旨在确定两种单倍型对植物出苗和出苗植物农艺特性的相对影响。温室实验是使用感染了已知单倍型（A、B 或 AB 混合）的块茎进行的，这些块茎是从两个不同的地点收集的。将收集的块茎种植在重复的盆中，每天监测植物的出苗情况。种植后 35 天，收获出苗的植物并测定单个植物的生物量、高度、茎直径和叶面积。对于这两个位置，与未感染的对照相比，用 Lso B 感染的块茎具有较低的植物出苗率。然而，感染了 Lso A 和 Lso B 的块茎在植物出苗方面没有差异。与未感染的块茎相比，感染了 Lso B 的块茎的植物出苗速度较慢，但​​感染了 Lso B 的块茎之间的植物出苗时间没有差异。 Lso A 和未感染的对照。无论单倍型如何，从未感染的块茎中长出的植物的生物量都大于所有 Lso 感染的块茎的生物量，并且从感染了 Lso A 的块茎中长出的植物的生物量大于感染了 Lso B 的块茎。 高度、茎的差异直径，