Juvenile hormone mediates the positive effects of nitrogen fertilization on weight and reproduction in pea aphid

Gao, Jing; Guo, Hui; Sun, Yucheng; Ge, Feng

doi:10.1002/ps.4932

Cited by 7 publications

(5 citation statements)

References 51 publications

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“…JH biosynthesis is thought to be a critical regulator of the JH titer. In several insect species, the JH titer positively correlates with the activity of the JH biosynthesis pathway 26–28 . Inhibiting the expressions or activities of the critical JH biosynthetic enzymes of Leptinotarsa decemlineata , Blattella germanica , and Aedes aegypti by RNA interference (RNAi) and inhibitors significantly decreased the hemolymph JH levels and finally led to malformed ovaries 29–31 .…”

Section: Introductionmentioning

confidence: 99%

Key role of juvenile hormone in controlling reproductive diapause in females of the Asian lady beetle Harmonia axyridis

Gao

Tian

et al. 2021

Pest Management Science

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BACKGROUND The Asian lady beetle Harmonia axyridis is an important predator of several agricultural pests, including aphids and whiteflies, and thus can contribute to pest management. Commercial viability as a pest control method requires that the beetle can be mass‐reared, and that workable conditions for extended shelf‐life can be guaranteed. One of the features of Harmonia's life cycle is that it enters diapause in the adult stage when the length of the photophase starts shortening in late summer. Reduction of juvenile hormone (JH) titer has been demonstrated to be the common endocrine mechanism inducing reproductive diapause in insects. However, whether H. axyridis enters diapause dependent on JH shutdown and how the JH level is regulated before diapause remains unknown. RESULTS Like in other insects, the absence of JH triggers the induction and maintenance of reproductive diapause in H. axyridis, indicated by JH measurements and the knockdown of an intracellular JH receptor methoprene‐tolerant (Met). Methoprene, a JH analog, significantly reversed diapause into reproduction via Met. Combined with RNA‐sequencing and RNA interference, we also demonstrated that JH biosynthesis rather than the JH degradation pathway determines the reduction of JH titer in diapausing females. CONCLUSION Our results reveal the vital role of JH in regulating reproductive diapause in female H. axyridis. Harmonia axyridis diapause could thus be manipulated by targeting JH production and JH signaling. © 2021 Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Key role of juvenile hormone in controlling reproductive diapause in females of the Asian lady beetle Harmonia axyridis

Gao

Tian

et al. 2021

Pest Management Science

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“…Increased nitrogen applications to crops potentially positively increased herbivore populations by improving plant nutrients 72,73 . We found general contrasting trends of N fertilizer applications per area in wheat or cereals between China and Europe over the last five decades.…”

Section: Discussionmentioning

confidence: 99%

Multidecadal, continent-level analysis indicates agricultural practices impact wheat aphid loads more than climate change

Xiao

Sun

et al. 2022

Commun Biol

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Temperature has a large influence on insect abundances, thus under climate change, identifying major drivers affecting pest insect populations is critical to world food security and agricultural ecosystem health. Here, we conducted a meta-analysis with data obtained from 120 studies across China and Europe from 1970 to 2017 to reveal how climate and agricultural practices affect populations of wheat aphids. Here we showed that aphid loads on wheat had distinct patterns between these two regions, with a significant increase in China but a decrease in Europe over this time period. Although temperature increased over this period in both regions, we found no evidence showing climate warming affected aphid loads. Rather, differences in pesticide use, fertilization, land use, and natural enemies between China and Europe may be key factors accounting for differences in aphid pest populations. These long-term data suggest that agricultural practices impact wheat aphid loads more than climate warming.

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“…Fertilization affects host plant nitrogen content insignificantly, altering pea aphid reproduction ( Buchman & Cuddington, 2009 ). Nitrogen-fertilized Medicago truncatula produces heavier and more fecund pea aphids ( Gao et al, 2018 ). Nitrogen input may not affect alfalfa’s phloem sap, pea aphids’ food source, but requires experimental verification ( Phillips, 1980 ; Buchman & Cuddington, 2009 ).…”

Section: Survey Methodologymentioning

confidence: 99%

A review of the impact of maize-legume intercrops on the diversity and abundance of entomophagous and phytophagous insects

Pierre

Jacobsen

Latournerie-Moreno

et al. 2023

PeerJ

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In many parts of the world, chemical pesticides are the primary method of pest control in maize (Zea mays L.) crops. Concerns about the negative consequences of chemical pesticide use on people’s health and the environment, as well as the emergence of insecticide resistance, have accelerated attempts to discover alternatives that are effective, low-risk, and cost-effective. Maize-legume intercropping systems are known to have multiple benefits to agroecosystem functioning, including pest regulation. This review focuses on the influence of maize-legume intercropping systems on insect diversity and abundance as a mechanism for insect pest regulation in maize crops. First, this review combines knowledge of maize-legume intercrops, with a particular emphasis on the mechanism by which this practice attracts beneficial insects (e.g., predators, parasitoids) to reduce pest damage in intercropping systems. In addition, the pairings of specific legume species with the greatest potential to attract more beneficial insects and therefore reduce maize pests are also discussed. Finally, future research needs are also recommended. Findings are reviewed in the context of looking for long-term management strategies that can increase the adoption of integrated pest management programs in maize-based production systems.

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Juvenile hormone mediates the positive effects of nitrogen fertilization on weight and reproduction in pea aphid

Abstract: The increased JH titre at the fourth instar and adult stage is required for the increases of weight and fecundity of A. pisum under nitrogen fertilization. © 2018 Society of Chemical Industry.

Cited by 7 publications

References 51 publications

Key role of juvenile hormone in controlling reproductive diapause in females of the Asian lady beetle Harmonia axyridis

Key role of juvenile hormone in controlling reproductive diapause in females of the Asian lady beetle Harmonia axyridis

Multidecadal, continent-level analysis indicates agricultural practices impact wheat aphid loads more than climate change

A review of the impact of maize-legume intercrops on the diversity and abundance of entomophagous and phytophagous insects

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