<i>Spodoptera exigua</i> modulates gossypol biosynthesis in cotton <i>Gossypium hirsutum</i>

Zebelo, Simon; Disi, Joseph Onwusemu; Balusu, Rammohan; Reeves, Benjamin; Fadamiro, Henry Y.

doi:10.1080/17429145.2017.1298853

Cited by 13 publications

(5 citation statements)

References 41 publications

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“…Our findings also indicated no effect of leaf damage on terpenoid gland density which also agrees with a previous study of ours with wild cotton suggesting this trait has low plasticity (Abdala‐Roberts, Pérez‐Niño, Moreira, et al, 2019). However, terpenoid concentrations are thought play a key role in cotton induced resistance to insect herbivory (Chen, Schmelz, Wäckers, & Ruberson, 2008; McAuslane & Alborn, 1998; Wu, Chen, Ge, & Sun, 2007; Zebelo, Disi, Balusu, Reeves, & Fadamiro, 2017), and previous studies have reported increased gland density in response to herbivory in cultivated cotton (McAuslane et al., 1997; Opitz et al., 2008). Interestingly, a previous study with cultivated cotton found that increased terpenoid concentrations can be achieved not only by increasing the number of glands but also increasing the filling of individual glands (Opitz et al., 2008).…”

Section: Discussionmentioning

confidence: 99%

Effects of soil salinity on the expression of direct and indirect defences in wild cotton Gossypium hirsutum

et al. 2020

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Previous studies have frequently reported effects of abiotic factors on herbivore‐induced plant defences based on effects on single plant traits. However, plants commonly express multiple defences simultaneously and these traits are often correlated. Thus, a fuller understanding of abiotic‐context dependency in plant defence requires measuring multiple traits and addressing their patterns of correlated expression. We evaluated the effects of soil salinity on the expression of direct (phenolic compounds, gossypol gland density) and indirect (volatile organic compounds, extrafloral nectar) defensive traits in wild cotton Gossypium hirsutum. Specifically, we asked whether soil salinity affects the induction of these traits, and whether it shapes trait correlations potentially underlying altered patterns of trait induction. We conducted a factorial experiment with 16 cotton genotypes where we manipulated soil salinity and defence induction by applying artificial leaf damage (25% mechanical damage and caterpillar oral secretions) and measured defence levels at different time points post damage. Leaf damage induced most traits except gossypol gland density, whereas salinity did not have a mean effect (across constitutive and induced levels) on any of the measured traits. Nonetheless, salinity prevented the induction of phenolic compounds (condensed and hydrolysable tannins), and also affected trait correlations. Specifically, phenolic compounds were negatively associated with nectar production only under salinized conditions, an apparent trade‐off that could affect the induction of phenolic compounds. In addition, positive correlations between phenolic compounds and gland density and root biomass observed under control conditions were lost under salinized conditions. Synthesis. By investigating the effects of soil salinity on the expression of multiple direct and indirect defensive traits and their underlying correlations, these findings build towards a better understanding of how abiotic context dependency shapes plant allocation to and expression of multiple defensive traits.

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Section: Discussionmentioning

confidence: 99%

Effects of soil salinity on the expression of direct and indirect defences in wild cotton Gossypium hirsutum

et al. 2020

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“…In this study, mechanical damage occurred only at the beginning of the experiment, whereas DBM‐damaged plants had constant pressure from the herbivore. There could be a difference in hormone levels or defensive compounds in plants that are fed on by caterpillars compared to those that simply receive mechanical damage (Zebelo et al., ). Both, herbivory and mechanical damage to nicotine plants, Nicotiana sylvestris Speg.…”

Section: Discussionmentioning

confidence: 99%

Herbivore‐induced plants do not affect oviposition but do affect fitness of subsequent herbivores on canola

Weeraddana

Evenden

2019

Entomologia Exp Applicata

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The diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Plutellidae), is oligophagous on plants in the Brassicaceae, and is considered one of the most significant insect pests of canola (Brassica napus L.), a major oilseed crop grown in the Prairie Provinces of Canada. The bertha armyworm (BAW), Mamestra configurata Walker (Lepidoptera: Noctuidae), is a generalist herbivore that preferentially feeds on canola plants. In the canola growing season in the Prairie Provinces of Canada, DBM feeding occurs prior to BAW herbivory. In this study, we test the effect of DBM herbivory on subsequent host use by BAW. Oviposition by female BAW was not influenced by previous DBM‐herbivory or mechanical damage of canola plants. Bertha armyworm larvae were deterred from feeding on canola previously damaged by DBM and larvae developed into lighter pupae when reared on DBM‐damaged plants. Bertha armyworm pupae that developed from larvae fed on mechanically damaged plants had similar pupal weights to those fed undamaged plants. Adult BAW reared on canola with previous DBM feeding damage had marginally smaller wings than moths reared on canola treated differently. The combination of these results suggests that herbivory by the brassicaceous specialist, DBM, negatively influences host use and larval performance by the generalist, BAW, on canola.

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“…In cotton, inducible terpenoids play an important role and plants that do not produce these terpenoids are less resistant against herbivores and pathogens [6, 23], therefore, maintaining this resistance trait is also highly important for the long-term success of ULGCS cotton. Herbivore damage in cotton plants increases the abundance of terpenoids and other relevant resistance traits, which has a negative impact on herbivores [24]. While previous studies have looked into the terpenoid-based resistance mechanisms of ULGCS cotton, they have not addressed the impact of the trait on plant-insect interactions.…”

Section: Discussionmentioning

confidence: 99%

Constitutive and induced insect resistance in RNAi-mediated ultra-low gossypol cottonseed cotton

et al. 2019

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Background Besides fibers, cotton plants also produce a large amount of seeds with a high oil and protein content. The use of these seeds is restricted by their high contents of the terpenoid gossypol, which is harmful to humans and livestock. Using a genetic engineering approach, “Ultra-low gossypol cottonseed” (ULGCS) plants were produced by knocking down an enzyme that catalyzes the formation of a precursor of gossypol. This was accomplished via RNAi-mediated silencing of the target gene using a seed-specific α-globulin promotor. Since gossypol is also a crucial defense mechanism against leaf-feeding herbivores, ULGCS plants might possess lower herbivore resistance than non-engineered plants. Therefore, we tested the constitutive and inducible direct insect resistance of two ULGCS cotton lines against the African cotton leafworm, Spodoptera littoralis . Result The herbivore was equally affected by both ULGCS lines and the control (Coker 312) line when feeding on fully expanded true leaves from undamaged plants and plants induced by jasmonic acid. When plants were induced by caterpillar-damage, however, S. littoralis larvae performed better on the ULGCS plants. Terpenoid analyses revealed that the ULGCS lines were equally inducible as the control plants. Levels of terpenoids were always lower in one of the two lines. In the case of cotyledons, caterpillars performed better on ULGCS cotton than on conventional cotton. This was likely caused by reduced levels of gossypol in ULGCS cotyledons. Conclusion Despite those effects, the insect resistance of ULGSC cotton can be considered as largely intact and the plants may, therefore, be an interesting alternative to conventional cotton varieties. Electronic supplementary material The online version of this article (10.1186/s12870-019-1921-9) contains supplementary material, which is available to authorized users.

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Spodoptera exigua modulates gossypol biosynthesis in cotton Gossypium hirsutum

Cited by 13 publications

References 41 publications

Effects of soil salinity on the expression of direct and indirect defences in wild cotton Gossypium hirsutum

Effects of soil salinity on the expression of direct and indirect defences in wild cotton Gossypium hirsutum

Herbivore‐induced plants do not affect oviposition but do affect fitness of subsequent herbivores on canola

Constitutive and induced insect resistance in RNAi-mediated ultra-low gossypol cottonseed cotton

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