Compatibility of tomato cultivar Santa Cruz Kada grafted on different Solanaceae species and control of bacterial wilt

ABSTRACT The objective of this work was to evaluate the compatibility, gas exchange and yield of tomato cultivar Santa Cruz Kada, susceptible to bacterial wilt (Ralstonia solanacearum) when grafted on different Solanaceae species. Rootstock sources were the mini-tomato RVTC-66, Cayenne pepper, Jerusalem cherry (Solanum pseudocapsicum), sticky nightshade (Solanum sisymbriifolium), and cultivar Santa Cruz Kada itself (self-grafting). Two materials were tested to promote the union between rootstocks and scions: grafting clips and biodegradable tape (Parafilm). Grafting success index (GSI) was evaluated and, for treatments using biodegradable tape, grafting incompatibility, gas exchange, agronomic characteristics and bacterial wilt epidemiology were assessed throughout the cycle. The use of biodegradable tape favored graft healing. Cayenne pepper, Jerusalem cherry, and sticky nightshade should not be employed as rootstocks for scions of tomato cultivar Santa Cruz Kada. The mini-tomato accession RVTC-66 showed low graft incompatibility, high photosynthetic efficiency and, when compared to self-grafting, the same fruit production, but with higher plant health index concerning the bacterial wilt.

摘要：本研究旨在评估对青枯劳尔氏菌（*Ralstonia solanacearum*）引发的青枯病（bacterial wilt）敏感的番茄品种圣克鲁斯·卡达（Santa Cruz Kada）嫁接到不同茄科（Solanaceae）物种后的嫁接亲和性、气体交换特性与产量。供试砧木包括迷你番茄RVTC-66、卡宴辣椒、冬珊瑚（*Solanum pseudocapsicum*）、粘毛茄（*Solanum sisymbriifolium*）以及圣克鲁斯·卡达品种自身（自嫁接组）。本研究采用嫁接夹与可降解胶带（Parafilm）两种材料辅助砧木与接穗的接合。本研究测定了嫁接成功率指数（Grafting success index, GSI）；针对使用可降解胶带的处理组，在整个生育周期内对嫁接不亲和性、气体交换特性、农艺性状及青枯病流行学特征进行了评估。使用可降解胶带可促进嫁接伤口愈合。卡宴辣椒、冬珊瑚与粘毛茄不宜作为圣克鲁斯·卡达番茄接穗的砧木。迷你番茄材料RVTC-66表现出较低的嫁接不亲和性与较高的光合效率；与自嫁接组相比，其果实产量持平，但针对青枯病的植株健康指数更高。