枳属砧木对柑橘黄龙病的抗性评价

Resistance Evaluation of Poncirus Rootstocks on Huanglongbing

柑橘砧木影响着柑橘品种多种园艺学与病理学性状,选育优良砧木是柑橘优质丰产的基础。本研究以13个枳属及其杂交种砧木为研究对象,分别嫁接黄龙病接穗后,通过观察症状表现及黄龙病菌浓度检测评估供试砧木对黄龙病的抗性。结果表明供试的砧木品种嫁接病穗3个月后除LT54、LT52、飞龙枳和枳柚外上均表现出了黄龙病症状,嫁接6个月后所有供试砧木品种均表现出黄龙病症状。黄龙病菌浓度检测结果显示,嫁接3个月后除了8株砧木外结果均为阳性,嫁接后6个月所有砧木检测结果均为阳性,供试接穗嫁接前和嫁接6个月后的病菌平均浓度相当。本研究结果表明供试的砧木品种均不抗黄龙病,为抗柑橘黄龙病砧木的进一步筛选奠定了良好基础。

Citrus rootstocks affect many horticultural and pathological traits of citrus varieties. It is a good basis for high yield and quality of citrus with good stock. In this study, 13 Poncirus trifoliate or hybrid rootstocks were used as materials with scions infected by Huanglongbing. Resistance evaluation of Poncirus rootstocks on Huanglongbing was carried out by symptoms observation and Las titer detection. The results showed that all the tested rootstocks had shown symptom of Huanglonbing except LT54, LT52, Flying Dragon Trifoliate and citrumelo 3 months after grafting. All the tested rootstocks showed the symptom of Huanglongbing 6 months after grafting. All the tested rootstocks were positive except 8 plants on the Las titer detection 3 months after grafting and were positive 6 months after grafting. The average of Las titer on the tested scions was almost the same before grafting and 6 months after grafting. All the tested rootstocks were not resistant to Huanglongbing. It laid a good foundation for screening rootstocks with resistante to Huanglongbing furtherly.