Advances in Breeding for Resistance to Insects

Sandhu, S. K.; Kang, Manjit S.

doi:10.1007/978-981-10-6056-4_3

Cited by 6 publications

(2 citation statements)

References 138 publications

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“…Based on literature, Variety 2 Yellow corn is a moderately tolerant variety that may not be detected based on mortality-based methods (Caasi-Lit & Fernandez, 2006). Tolerance refers to the ability of a host plant to resist or tolerate insect damage such that, under equivalent insect injury, economic traits (agronomic yield or quality) of tolerant plants were affected to a lesser extent than of plants lacking the ability to tolerate damage (Sandhu & Kang, 2017). There are currently no studies explaining the tolerance mechanism of Variety 2 (Yellow corn) to insect pest feeding specifically, on ACB feeding.…”

Section: Mean Initial and Final Weight (G)mentioning

confidence: 99%

Resistance Mechanism Exhibited by Selected Maize Varieties to Asian Corn Borer Ostrinia furnacalis Guenee (Lepidoptera: Crambidae), Philippines

et al. 2021

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The resistance mechanisms exhibited by the five selected maize varieties against Ostrinia furnacalis [Gueene] or the Asian corn borer (ACB) were identified and evaluated in the study in terms of the insects' percent mortality and development. The detached leaf-feeding assay was used in the experiment and laid out in Complete Randomized Design (CRD) with 5 treatments and replicated three times. Findings among the five selected maize varieties tested against ACB, Bt corn had exhibited a high degree of antibiosis mechanism. This was expected because of the Bt toxin from the maize variety conferring toxicity to Lepidopterous insect pests like ACB. A similar result with Variety 4 (Yellow Dent corn) was observed which shows a high degree of antibiosis mechanism that is innate within the maize leaves of the variety. Variety 1 (UPLB Lagkitan), Variety 2 (Yellow corn), and Variety 3 (White corn) show high susceptibility to ACB. Tolerance of the corn varieties to ACB needs to be further investigated because it is unknown to date whether the varieties possess or lack plant tolerance characteristics. Leaf whorl feeding assays used in the study only measure the antibiosis and antixenosis mechanisms in maize. Furthermore, a test to measure tolerance mechanisms is suggested among the maize varieties.

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Section: Mean Initial and Final Weight (G)mentioning

confidence: 99%

Resistance Mechanism Exhibited by Selected Maize Varieties to Asian Corn Borer Ostrinia furnacalis Guenee (Lepidoptera: Crambidae), Philippines

et al. 2021

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“…Efforts have been made to screen out the DNA markers linked with genes responsible for the resistance against pests in some model plant species (Broekgaarden et al . 2011; Sandhu and Kang 2017). Mapping wheat genome through microsatellite markers, two QTLs from 12-oxo-phytodienoic acid reductase (OPR) and lipoxygenase (LOX) genes was reported significantly associated with resistance to Hessian fly ( Mayetiola destructor ) in wheat (Tan et al .…”

Section: Introductionmentioning

confidence: 99%

Genetic variation associated with relative resistance in teak (Tectona grandis L. f.) against the leaf skeletonizer, Eutectona machaeralis Walker

Vaishnav

Kulkarni

Rana³

et al. 2022

Preprint

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Background: Photosynthesizing tissue of teak (Tectona grandis L. f.) foliage is damaged by a host-specific insect pest called leaf skeletonizer (Eutectona machaeralis Walker) that severely eclipses annual growth increment and carbon sequestration of natural populations and plantation of teak. Gene-assisted selection of relatively resistant teak clones may efficiently control the damage in the populations and plantations. The present investigation aimed to identify genetic variation associated with relative resistance in teak against the pest. Method: The investigation was carried out on 106 teak plus tree clones assembled at the National Teak Germplasm Bank from the Indian meta-population of teak. Resistance data were obtained recording the ocular damage caused by the pest to teak accessions for four years. Genotyping of the teak accessions was performed with 21 co-dominant markers and marker-trait association mapping was performed confirming the genetic structure of the germplasm bank and linkage disequilibrium (LD) among the marker loci. Results: The sampled teak accessions exhibited a low albeit highly admixed genetic structure (FST=0.07) and low level of LD (16.66%) among loci, making them suitable for high-resolution association analysis. A significant correlation (p≤0.01, R2=0.67) was obtained between intra-specific heterozygosity and the relative resistance against the pest. A marker locus CCoAMT-1 representing the enzyme caffeoyl-CoA O-methyltransferase of phenylpropanoid pathway was also found significantly (p≤0.05) associated with the relative resistance against the pest explaining 6.6% of the phenotypic variation (R2=0.066) through positive effect (0.57) on the trait. Conclusions: The present work exhibited a significant correlation of intra-specific heterozygosity with relative resistance in teak against a pest. It is the first report on teak identifying genetic markers associated with relative resistance against the pest. The marker can be applied for the selection of resistant planting stock for breeding and commercial plantation. Further investigation can be performed to understand the expression level polymorphism linked with the resistance applying next-generation sequencing approaches.

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