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Vip3Aa and Cry1Ab proteins in maize reduce Fusarium ear rot and fumonisins by deterring kernel injury from multiple Lepidopteran pests

机译:玉米中的Vip3Aa和Cry1Ab蛋白通过阻止多种鳞翅目害虫的仁害而减少镰刀菌的腐烂和伏马毒素

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摘要

Field trials were conducted in 2008, 2009 and 2011 to assess fumonisin contamination in transgenic Bacillus thuringiensis (Bt) and non-Bt maize hybrids infested with European corn borer, corn earworm, and Western bean cutworm. Comparisons were made among maize hybrids expressing two transgenic insect resistance proteins (Cry1Ab x Vip3Aa), a single resistance protein (Cry1Ab), or no insect resistance. The field design was a randomized complete block with four replicates of each hybrid x insect combination. Kernel injury, Fusarium ear rot, and fumonisins (FB1+FB2+FB3) in maize grain were measured. These measurements differed significantly among years of the study. In all years, significant positive correlations were present between insect injury and Fusarium ear rot, insect injury and grain fumonisin levels, and Fusarium ear rot and grain fumonisin levels. Under all insect infestation treatments, Cry1Ab x Vip3Aa hybrids were the most resistant of the hybrids with regard to any of the grain quality measurements. Averaged over all insect infestations and years, insect injury, Fusarium ear rot, and grain fumonisin levels were all low in Cry1Ab x Vip3Aa (0.1% and 2.2% of total kernels, and 0.56 mg/kg, respectively). The highest average levels of insect injury, Fusarium ear rot, and grain fumonisin contamination (3.3% and 7.2% of total kernels, and 5.47 mg/kg, respectively) were found in the non-Bt hybrids. The presence of transgenic insect protection (Cry1Ab x Vip3Aa or Cry1Ab) resulted in significant reductions in all grain quality measurements as compared with the non-Bt hybrids. Only grain obtained from Cry1Ab x Vip3Aa hybrids consistently had acceptable fumonisin content according to both U.S. guidance levels and E.U. regulatory limits. These results indicate that Cry1Ab x Vip3Aa maize hybrids are more likely to yield high quality, low-fumonisin grain compared to hybrids expressing only Cry1Ab or lacking insect resistance.
机译:在2008年,2009年和2011年进行了田间试验,以评估转基因的苏云金芽胞杆菌(Bt)和非Bt玉米杂交种中的伏马菌素污染,这些玉米杂种受到欧洲玉米bore,玉米耳虫和西豆角虫侵染。在表达两种转基因昆虫抗性蛋白(Cry1Ab x Vip3Aa),单一抗性蛋白(Cry1Ab)或无昆虫抗性的玉米杂交种之间进行比较。田间设计是一个随机完整块,每个杂种x昆虫组合重复四次。测量了玉米籽粒中的籽粒损伤,镰刀菌穗腐病和伏马毒素(FB1 + FB2 + FB3)。这些年的研究中,这些测量值有显着差异。在所有年份中,昆虫伤害和镰刀菌耳朵腐烂,昆虫伤害和谷物伏马毒素含量与镰刀菌耳朵腐烂和谷物伏马毒素含量之间均存在显着的正相关。在所有昆虫侵染处理下,就任何谷物质量测量而言,Cry1Ab x Vip3Aa杂种都具有最强的抗性。 Cry1Ab x Vip3Aa的虫害,多年镰刀菌和镰刀菌伏马毒素的平均含量在所有虫害和年份中均较低(分别占总粒数的0.1%和2.2%,分别为0.56 mg / kg)。在非Bt杂种中发现最高的平均昆虫伤害水平,镰刀菌耳腐病和伏马菌素颗粒污染(分别占总粒数的3.3%和7.2%,以及5.47 mg / kg)。与非Bt杂种相比,转基因昆虫保护(Cry1Ab x Vip3Aa或Cry1Ab)的存在导致所有谷物质量指标的显着降低。根据美国指导水平和欧盟标准,仅从Cry1Ab x Vip3Aa杂种获得的谷物始终具有可接受的伏马菌素含量。监管限制。这些结果表明,与仅表达Cry1Ab或缺乏昆虫抗性的杂种相比,Cry1Ab x Vip3Aa玉米杂种更可能产生高质量,低伏马菌素粒。

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