Changes in growth and development in cotton associated with genes for frego bract and glabrous leaf

1984 ◽  
Vol 24 (126) ◽  
pp. 426 ◽  
Author(s):  
PE Reid ◽  
NJ Thomson
Keyword(s):  
Field Experiment ◽  
Pest Management ◽  
Growth And Development ◽  
Fruit Production ◽  
Management Program ◽  
Lower Proportion ◽  
Factorial Analysis ◽  
Reproductive Tissue ◽  
Near Isogenic Lines ◽  
Isogenic Lines

Changes to cotton morphology and phenology associated with the frego bract and glabrous leaf genes (singly and combined) were measured in a field experiment using four near isogenic lines. Factorial analysis showed that frego bract was associated with more changes than glabrous leaf and that there were few significant interactions. Frego bract plants were 7% taller than normal bract plants at maturity, exhibited a delay in fruit production, had a greater proportion of fruit on sympodia of monopodial branches, shed more squares and had a lower proportion of reproductive to nonreproductive tissue. Glabrous-leafed plants produced fruit slightly later than hairy-leafed plants and had a lower proportion of reproductive to non-reproductive tissue. Overall, the growth of frego bract and glabrous-leafed plants was not sufficiently different from that of normal plants to warrant changes to the simple fruit model in the commercially available SIRATAC pest management program.

scholarly journals Lipoxygenase activities during development of root and nodule of soybean

2004 ◽  
Vol 39 (7) ◽  
pp. 625-630 ◽  
Author(s):  
Tatiana Góes Junghans ◽  
Maria Goreti de Almeida Oliveira ◽  
Maurilio Alves Moreira
Keyword(s):  
Growth And Development ◽  
Root Formation ◽  
Lipoxygenase Activity ◽  
Post Inoculation ◽  
Isogenic Line ◽  
Near Isogenic Line ◽  
Near Isogenic Lines ◽  
Isogenic Lines ◽  
Bradyrhizobium Elkanii ◽  
Over Time

The objective of this work was to evaluate root and nodule soybean lipoxygenases in Doko cultivar and in a near isogenic line lacking seed lipoxygenases, inoculated and uninoculated with Bradyrhizobium elkanii. The lipoxygenase activities from roots collected at 3, 5, 9, 13, 18 and 28 days post-inoculation and from nodules collected at 13, 18 and 28 days post-inoculation were measured. The pH-activity profiles from root and nodules suggested that the lipoxygenases pool expressed in these organs from Doko cultivar and triple-null near isogenic lines are similar. The root lipoxygenase activity of Doko and triple-null lines, inoculated and uninoculated, reduced over time. The highest lipoxygenase activity observed at the beginning of root formation suggests the involvement of this enzyme in growth and development of this organ. However, for nodules an expressive increase of lipoxygenase activity was noticed 28 days post-inoculation. Root and nodule showed, at least, two mobility groups for lipoxygenases in immunoblottings, with approximately 94 and 97 kDa.

Sweeping the flies away: evidence from a fruit fly eradication program

2020 ◽  
Vol 47 (5) ◽  
pp. 1920-1962
Author(s):  
Lina Salazar ◽  
Julian Aramburu ◽  
Marcos Agurto ◽  
Alessandro Maffioli ◽  
Jossie Fahsbender
Keyword(s):  
Pest Management ◽  
Prevention And Control ◽  
Regression Discontinuity ◽  
Fruit Fly ◽  
Fruit Production ◽  
Management Program ◽  
Regression Discontinuity Design ◽  
Short Term ◽  
Pre Treatment ◽  
And Control

Abstract This article evaluates the short-term impacts of a fruit fly integrated pest management program in Peru. Exploiting arbitrary variation in the program’s intervention borders, we use a geographical regression discontinuity design to identify the program’s effects on agricultural outcomes. Pre-treatment balance tests show that producer and farm-level pre-treatment characteristics evolve smoothly at the intervention border. Results indicate that farmers within treated areas improved pest knowledge and are more likely to implement prevention and control practices. Also, they increased fruit production and sales. Our findings are confirmed by placebo tests and are robust to alternative regression discontinuity bandwidths and polynomials.

scholarly journals The Economic Feasibility of Tree Fruit Integrated Pest Management in the Northeast

1982 ◽  
Vol 11 (2) ◽  
pp. 39-45 ◽  
Author(s):  
G. B. White ◽  
Peter Thompson
Keyword(s):  
New York ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Fruit Production ◽  
Management Program ◽  
Economic Feasibility ◽  
Farm Size ◽  
Pilot Program ◽  
Wayne County ◽  
Tree Fruit

A pilot tree fruit pest management program in Wayne County, New York was evaluated. Thirty-three blocks of fruit were matched for 26 participants in the pilot program and for 23 nonparticipants. Participants reduced pesticide costs and total pest management costs in comparison to nonparticipants. Factors which will affect the adoption of Integrated Pest Management in other locations include the attitudes of growers, farm size, and the density of fruit production. Integrated Pest Management programs are economically feasible for several other areas of high tree fruit density in the Northeast.

Electron investigations of rhabdovirus-like particles in mexican bean beetles and crickets

1978 ◽  
Vol 36 (2) ◽  
pp. 378-379
Author(s):  
J. R. Adams ◽  
G. J Tompkins ◽  
A. M. Heimpel ◽  
E. Dougherty
Keyword(s):  
Biological Control ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Developmental Stages ◽  
Management Program ◽  
Acheta Domesticus ◽  
Epilachna Varivestis ◽  
House Cricket ◽  
Similar Morphology ◽  
Bean Beetle

As part of a continual search for potential pathogens of insects for use in biological control or on an integrated pest management program, two bacilliform virus-like particles (VLP) of similar morphology have been found in the Mexican bean beetle Epilachna varivestis Mulsant and the house cricket, Acheta domesticus (L. ).Tissues of diseased larvae and adults of E. varivestis and all developmental stages of A. domesticus were fixed according to procedures previously described. While the bean beetles displayed no external symptoms, the diseased crickets displayed a twitching and shaking of the metathoracic legs and a lowered rate of activity.Examinations of larvae and adult Mexican bean beetles collected in the field in 1976 and 1977 in Maryland and field collected specimens brought into the lab in the fall and reared through several generations revealed that specimens from each collection contained vesicles in the cytoplasm of the midgut filled with hundreds of these VLP's which were enveloped and measured approximately 16-25 nm x 55-110 nm, the shorter VLP's generally having the greater width (Fig. 1).

scholarly journals Primary metabolite contents are correlated with seed protein and oil traits in near-isogenic lines of soybean

2019 ◽  
Vol 7 (5) ◽  
pp. 651-659 ◽  
Author(s):  
Jie Wang ◽  
Pengfei Zhou ◽  
Xiaolei Shi ◽  
Na Yang ◽  
Long Yan ◽  
...  
Keyword(s):  
Seed Protein ◽  
Near Isogenic Lines ◽  
Primary Metabolite ◽  
Isogenic Lines

Comparative analysis of genetic background in eight near-isogenic wheat lines with different H genes conferring resistance to Hessian fly

Genome ◽  
2011 ◽  
Vol 54 (1) ◽  
pp. 81-89 ◽  
Author(s):  
S. S. Xu ◽  
C. G. Chu ◽  
M. O. Harris ◽  
C. E. Williams
Keyword(s):  
Genetic Background ◽  
Genetic Similarity ◽  
Triticum Aestivum L ◽  
Hessian Fly ◽  
Pedigree Analysis ◽  
Recurrent Parent ◽  
Linkage Drag ◽  
Near Isogenic Lines ◽  
Isogenic Lines ◽  
H Gene

Near-isogenic lines (NILs) are useful for plant genetic and genomic studies. However, the strength of conclusions from such studies depends on the similarity of the NILs’ genetic backgrounds. In this study, we investigated the genetic similarity for a set of NILs developed in the 1990s to study gene-for-gene interactions between wheat ( Triticum aestivum L.) and the Hessian fly ( Mayetiola destructor (Say)), an important pest of wheat. Each of the eight NILs carries a single H resistance gene and was created by successive backcrossing for two to six generations to susceptible T. aestivum ‘Newton’. We generated 256 target region amplification polymorphism (TRAP) markers and used them to calculate genetic similarity, expressed by the Nei and Li (NL) coefficient. Six of the NILs (H3, H5, H6, H9, H11, and H13) had the highly uniform genetic background of Newton, with NL coefficients from 0.97 to 0.99. However, genotypes with H10 or H12 were less similar to Newton, with NL coefficients of 0.86 and 0.93, respectively. Cluster analysis based on NL coefficients and pedigree analysis showed that the genetic similarity between each of the NILs and Newton was affected by both the number of backcrosses and the genetic similarity between Newton and the H gene donors. We thus generated an equation to predict the number of required backcrosses, given varying similarity of donor and recurrent parent. We also investigated whether the genetic residues of the donor parents that remained in the NILs were related to linkage drag. By using a complete set of ‘Chinese Spring’ nullisomic-tetrasomic lines, one third of the TRAP markers that showed polymorphism between the NILs and Newton were assigned to a specific chromosome. All of the assigned markers were located on chromosomes other than the chromosome carrying the H gene, suggesting that the genetic residues detected in this study were not due to linkage drag. Results will aid in the development and use of near-isogenic lines for studies of the functional genomics of wheat.

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