DIMBOA levels in hexaploid Brazilian wheat are not associated with antibiosis against the cereal aphids Rhopalosiphum padi and Sitobion avenae
DIMBOA levels in hexaploid Brazilian wheat are not associated with antibiosis against the cereal aphids Rhopalosiphum padi and Sitobion avenae
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DOI：
10.1007/s40626-017-0084-z
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发表时间：
2017-05
影响因子：
2.6
通讯作者：
J. F. Pereira;A. Sarria;S. Powers;G. I. Aradottir;J. Caulfield;Janet L. Martin;L. Smart;J. Pickett-J.
中科院分区：
文献类型：
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作者：
J. F. Pereira;A. Sarria;S. Powers;G. I. Aradottir;J. Caulfield;Janet L. Martin;L. Smart;J. Pickett-J.
本研究的目的是评估天然水平的植物防御化合物丁布（2，4-二羟基-7-甲氧基-1，4-苯并恶嗪-3-酮）在八个六倍体巴西小麦基因型的幼叶和基因型对谷物蚜虫，禾谷缢管蚜和麦长管蚜的发展的影响。HPLC分析显示，DIMBOA水平从5.376（BRS Guabiju）到30.651 mmol kg FW−1（BRS Timbaúva）不等，其中两种基因型优于Solstice，一种英国品种用作参考。生物测定进行了评估的发展和繁殖力的蚜虫时，生长在小麦基因型。虽然BRS Guabiju和BRS Timbaúva是对两种蚜虫分别表现出最高敏感性和抗性的基因型，但丁布阿水平与蚜虫效应之间没有相关性。品种BRS 327是两种蚜虫种群内禀增长率较低的基因型之一。阐明了次生代谢产物在植物抗蚜中的作用，并描述了允许减少R.帕迪安和S.燕麦是在六倍体巴西小麦中获得更好的天然抗性的重要步骤。
The objective of this study was to evaluate the natural levels of the plant defence compound DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) in young leaves of eight hexaploid Brazilian wheat genotypes and the impact of the genotypes upon development of cereal aphids,Rhopalosiphum padiandSitobion avenae. HPLC analysis revealed that the DIMBOA levels varied from 5.376 (in BRS Guabiju) to 30.651 mmol kg FW−1(in BRS Timbaúva) with two genotypes outperforming Solstice, a UK variety used as reference. Bioassays were conducted to evaluate the development and fecundity of both aphids when grown on the wheat genotypes. Although BRS Guabiju and BRS Timbaúva were among the genotypes showing the highest susceptibility and resistance, respectively, against both aphid species, no correlation could be found between DIMBOA levels and antibiosis effects. The cultivar BRS 327 was among the genotypes showing lower intrinsic rate of population increase for the two aphid species. Elucidating the role of secondary metabolites in plant resistance to aphids and the characterization of the genotypes that allowed reduced development ofR. padiandS. avenaeare important steps to achieve a better natural resistance in hexaploid Brazilian wheat.