Effects of transgenic corn hybrids expressing Bt toxins on the development and fecundity ofHelicoverpa zea 

2016 ◽  
Author(s):  
Thomas R Bilbo
Keyword(s):  
Transgenic Corn ◽  
Corn Hybrids ◽  
Bt Toxins

scholarly journals COMPATIBILIDADE DE MILHO TRANSGÊNICO COM O PARASITOIDE Trichogramma pretiosum

2017 ◽  
Vol 16 (1) ◽  
pp. 43 ◽  
Author(s):  
DANIEL SPAGNOL ◽  
ANDERSON DIONEI GRÜTZMACHER ◽  
RODOLFO VARGAS CASTILHOS ◽  
RAFAEL ANTÔNIO PASINI ◽  
RONALDO ZANTEDESCHI ◽  
...  
Keyword(s):  
Biological Control ◽  
Bacillus Thuringiensis ◽  
Sex Ratio ◽  
Egg Parasitoid ◽  
Transgenic Corn ◽  
Trichogramma Pretiosum ◽  
Corn Hybrids ◽  
Anagasta Kuehniella ◽  
Bt Toxins ◽  
Total Parasitism

RESUMO - Plantas de milho transgênicas que expressam toxinas da bactéria Bacillus thuringiensis (Bt) são uma alternativa para o controle de insetos-praga na cultura. No entanto, estas toxinas podem ser encontradas no pólen do milho, e organismos não alvo, como os inimigos naturais, podem ser prejudicados. Assim, o objetivo deste trabalho foi avaliar o efeito do pólen de três híbridos de milho transgênicos sobre parâmetros biológicos de adultos do parasitoide de ovos Trichogramma pretiosum em condições laboratoriais. Fêmeas recém-emergidas de T. pretiosum foram individualizadas em tubos de Duran contendo como alimento mel acrescido do pólen dos híbridos de milho transgênico AG 8011 YG (Cry1Ab), AS 1551 VT PRO (Cry1A. 105 + Cry 2Ab2) e Status Viptera (Vip3Aa20), e de seus respectivos isogênicos convencionais. Diariamente, foram ofertados, em cada tubo, ovos de Anagasta kuehniella para parasitismo. Os parâmetros avaliados foram: longevidade das fêmeas expostas ao pólen, taxa de parasitismo total, taxa de emergência e razão sexual da progênie. Os híbridos transgênicos: AG 8011 YG (Cry1Ab), AS 1551 VT PRO (Cry1A. 105 + Cry 2Ab2) e Status Viptera (Vip3Aa20), bem como seus isogênicos convencionais, não causaram efeitos deletérios sobre a longevidade e capacidade de parasitismo das fêmeas de T. pretiosum expostas aos respectivos pólens. A emergência e razão sexual da progênie também não foram negativamente afetadas, possibilitando assim a compatibilização dos transgênicos avaliados com o controle biológico natural e aplicado exercido por este parasitoide.Palavras-chave: Bacillus thuringiensis, transgenia, manejo integrado de pragas, controle biológico, Zea mays.COMPATIBILITY OF TRANSGENIC CORN WITH THE PARASITOID Trichogramma pretiosumABSTRACT - Transgenic corn expressing Bacillus thuringiensis (Bt) toxins is an alternative for pest control in corn fields. However, some non-target organisms such as natural enemies can be impaired by corn pollen containing toxins. Therefore, the aim of this work was to evaluate the effect of the pollen from three transgenic corn varieties on biological parameters of the egg parasitoid Trichogramma pretiosum under laboratorial conditions. Emerged females of T. pretiosum were placed into Duran tubes and fed with honey + pollen of corn hybrids AG 8011 YG (Cry1Ab), AS 1551 VT PRO (Cry1A. 105 + Cry 2Ab2) and Status Viptera (Vip3Aa20), as well as their respective isogenic. Daily, eggs of Anagasta kuehniella were offered in each tube for parasitism. The parameters evaluated were longevity of females exposed to pollen, total parasitism, progeny emergency and sex ratio. The transgenic hybrids AG 8011 YG (Cry1Ab), AS 1551 VT PRO (Cry1A. 105 + Cry 2Ab2), Status Viptera (Vip3Aa20) and their isogenic showed no deleterious effect on longevity and parasitism capacity of T. pretiosum females exposed to respective pollen. Emergency and sex ratio from progeny were also not adversely affected, thus enabling the compatibility of the evaluated transgenic with biological control by this parasitoid.  Keywords: Bacillus thuringiensis, transgenes, integrated pest management, biological control, Zea mays.

Performance of Transgenic Corn Hybrids in Missouri for Insect Control and Yield

2000 ◽  
Vol 93 (3) ◽  
pp. 993-999 ◽  
Author(s):  
B. D. Barry ◽  
L. L. Darrah ◽  
D. L. Huckla ◽  
A. Q. Antonio ◽  
G. S. Smith ◽  
...  
Keyword(s):  
Insect Control ◽  
Transgenic Corn ◽  
Corn Hybrids

scholarly journals Macronutrient uptake and export in transgenic corn under two levels of fertilization

2018 ◽  
Vol 53 (12) ◽  
pp. 1363-1372
Author(s):  
Carine Gregório Machado Silva ◽  
Álvaro Vilela de Resende ◽  
Aarón Martínez Gutiérrez ◽  
Silvino Guimarães Moreira ◽  
Emerson Borghi ◽  
...  
Keyword(s):  
Dry Matter ◽  
Block Design ◽  
Growth Stages ◽  
Transgenic Corn ◽  
Corn Hybrids ◽  
Differential Behavior ◽  
Supplementary Irrigation ◽  
Fertilization Level ◽  
High Fertilization

Abstract: The objective of this work was to evaluate macronutrient uptake and export by transgenic corn hybrids under medium and high fertilization levels. For each fertilization level, a randomized complete block design was carried out in the summer crop season, under no-tillage and supplementary irrigation, with four cultivars and four replicates. Plants were sampled throughout the entire cycle and separated into leaves, stalk, husk, cob, and grains for the determination of dry matter mass and accumulation of macronutrients in the different growth stages. Under the high fertilization level, a greater dry matter mass and nutrient uptake were observed, but grain yield was similar to that under the medium fertilization level. The uptake of N, P, Ca, Mg, and S occurs until later in the cycle of the transgenic cultivars, which also showed lower concentrations of P, K, and S in grains, when compared to older hybrids. The differential behavior of the evaluated cultivars under different fertilization levels indicates the need of updating and improving nutritional management and fertilizer recommendations for the corn crop.

Impact of Corn Earworm Injury on Yield of Transgenic Corn Producing Bt Toxins in the Carolinas

2014 ◽  
Vol 107 (3) ◽  
pp. 1101-1109 ◽  
Author(s):  
Francis P. F. Reay-Jones ◽  
Dominic D. Reisig
Keyword(s):  
Corn Earworm ◽  
Transgenic Corn ◽  
Bt Toxins

Southwestern corn borer damage and aflatoxin accumulation in conventional and transgenic corn hybrids

2005 ◽  
Vol 91 (2-3) ◽  
pp. 329-336 ◽  
Author(s):  
W. Paul Williams ◽  
Gary L. Windham ◽  
Paul M. Buckley ◽  
James M. Perkins
Keyword(s):  
Transgenic Corn ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Aflatoxin Accumulation ◽  
Southwestern Corn Borer

Decreased Whorl and Ear Damage in Nine Mon810 Bacillus thuringiensis (Bt)-Transgenic Corn Hybrids Compared with Their Non-Bt Counterparts

2006 ◽  
Vol 99 (6) ◽  
pp. 2164-2170 ◽  
Author(s):  
Charles F. Chilcutt ◽  
Gary N. Odvody ◽  
J. Carlos Correa ◽  
Jeff Remmers ◽  
Roy D. Parker
Keyword(s):  
Bacillus Thuringiensis ◽  
Transgenic Corn ◽  
Corn Hybrids

Decreased Whorl and Ear Damage in Nine Mon810 Bacillus thuringiensis (Bt)-Transgenic Corn Hybrids Compared with Their Non-Bt Counterparts

2006 ◽  
Vol 99 (6) ◽  
pp. 2164-2170 ◽  
Author(s):  
Charles F. Chilcutt ◽  
Gary N. Odvody ◽  
J. Carlos Correa ◽  
Jeff Remmers ◽  
Roy D. Parker
Keyword(s):  
Bacillus Thuringiensis ◽  
Transgenic Corn ◽  
Corn Hybrids

Influence of Transgenic Corn Expressing Insecticidal Protein of Bacillus thuringiensis Berliner on Natural Populations of Corn Earworm (Lepidoptera: Noctuidae) and Southwestern Corn Borer (Lepidoptera: Crambidae)

2006 ◽  
Vol 41 (3) ◽  
pp. 221-231 ◽  
Author(s):  
Kerry C. Allen ◽  
Henry N. Pitre
Keyword(s):  
Bacillus Thuringiensis ◽  
Helicoverpa Zea ◽  
Larval Growth ◽  
Natural Populations ◽  
Corn Earworm ◽  
Bt Corn ◽  
Transgenic Corn ◽  
Diatraea Grandiosella ◽  
Corn Hybrids ◽  
Corn Borer

A 2-yr study was conducted to measure the influence of transgenic corn, Zea mays L., expressing the CrylAb endotoxin of Bacillus thuringiensis (Berliner) (Bt) by means of Event MON810 on natural populations of Helicoverpa zea (Boddie) and Diatraea grandiosella (Dyar). The studies were conducted at Leland and Morgan City, MS, in 1999 and at Morgan City in 2000. Although total numbers of H. zea larvae were not significantly different on transgenic corn hybrids compared with their near-isogenic parent lines, fewer large larvae were found on the transgenic hybrids. Differences in H. zea larval growth were noticeable when larvae fed on Bt corn vs non-Bt corn. The delay in larval growth for insects within a single generation, which could possibly result in asynchronous mating between insecticide resistant and susceptible insects, was observed for larvae feeding on plants expressing the Bt toxin. Diatraea grandiosella caused limited damage to the transgenic corn hybrids compared with their near-isogenic parent lines. Yields were not significantly greater for the Bt corn hybrids compared with their near-isogenic parent lines. Yields were not significantly greater for the Bt corn hybrids compared with the near-isogenic, non-Bt corn parents; however, there was a trend toward higher yields for Bt hybrids compared with their near-isogenic non-Bt parents.

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