scholarly journals Plant secondary metabolites (PSMs) of Brassicaceae and their role in plant defense against insect herbivores – A review

2017 ◽  
Vol 9 (1) ◽  
pp. 508-519 ◽  
Author(s):  
Sarwan Kumar

The genus Brassica includes economically important oilseed and vegetable plants. A number of insect pests are known to infest these crops and cause significant losses in yield. The plants in the family Brassicaceae have multiple defense mechanisms to overcome or reduce the damage by these pests including defensive biochemicals. These Plant Secondary Metabolites (PSMs) involve myrosinase-glucosinolate system, different volatile com-pounds, lectins, phytoalexins and phytoanticipins. While some of the compounds are always present in the plant system, the others are synthesized after herbivore attack. These compounds can either directly protect the plant by having effect(s) on insects’ biology/behaviour or indirectly by attracting the natural enemies of the pests. Because of these secondary compounds, Brassicas have the potential to be used in pest management such as biofumigation against soil pests, as trap crops and cover crops and hence, can be a part of push-pull strategy. An attempt has been made to review these compounds in Brassicas, their role in defense against insects and potential in pest management.

Author(s):  
Ukoroije, Rosemary Boate ◽  
Otayor, Richard Abalis

Bio-pesticides are biological derived agents that are usually applied in a manner similar to synthetic pesticides but achieve pest management in an environmental friendly way. Bioinsecticides have the advantages of been reportedly eco-friendly both to man and the environment, are target specific, lack problem of residue, least persistent in environment, locally available, easily processed and inexpensive, though with the limitation of requiring repeated applications for the achievement of optimal control of insect pests while enhancing crop protection. The mode of action of bioinsecticides on insects includes repellent action, antifeedant activity, oviposition deterrent properties, growth and development inhibition, toxicity, attractants, sterility and death. Hence, bioinsecticides can be included in integrated pest management programs for crop protection and insect pest control. The review on biopesticidal properties of some plant secondary metabolites in the leaves, stems, bark, fruits, flowers, cloves, rhizomes, grains and seeds of plants and their interference with the growth, feeding, reproduction of insect pestsfor pest management has been elaborated.


Insects ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 128 ◽  
Author(s):  
Shovon Chandra Sarkar ◽  
Endong Wang ◽  
Shengyong Wu ◽  
Zhongren Lei

Companion planting is a well-known strategy to manage insect pests and support a natural enemy population through vegetative diversification. Trap cropping is one such type of special companion planting strategy that is traditionally used for insect pest management through vegetative diversification used to attract insect pests away from the main crops during a critical time period by providing them an alternative preferred choice. Trap crops not only attract the insects for feeding and oviposition, but also act as a sink for any pathogen that may be a vector. Considerable research has been conducted on different trap crops as companion plant species to develop improved pest management strategies. Despite this, little consensus exists regarding optimal trap cropping systems for diverse pest management situations. An advantage of trap cropping over an artificially released natural enemy-based biological control could be an attractive remedy for natural enemies in cropping systems. Besides, many trap crop species can conserve natural enemies. This secondary effect of attracting natural enemies may be an advantage compared to the conventional means of pest control. However, this additional consideration requires a more knowledge-intensive background to designing an effective trap cropping system. We have provided information based on different trap crops as companion plant, their functions and an updated list of trap cropping applications to attract insect pests and natural enemies that should be proven as helpful in future trap cropping endeavors.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Delphine M. Pott ◽  
José G. Vallarino ◽  
Eduardo Cruz-Rus ◽  
Lothar Willmitzer ◽  
José F. Sánchez-Sevilla ◽  
...  

AbstractPhenylpropanoids are a large class of plant secondary metabolites, which play essential roles in human health mainly associated with their antioxidant activity. Strawberry (Fragaria × ananassa) is a rich source of phytonutrients, including phenylpropanoids, which have been shown to have beneficial effects on human health. In this study, using the F. × ananassa ‘232’ × ‘1392’ F1 segregating population, we analyzed the genetic control of individual phenylpropanoid metabolites, total polyphenol content (TPC) and antioxidant capacity (TEAC) in strawberry fruit over two seasons. We have identified a total of 7, 9, and 309 quantitative trait loci (QTL) for TPC, TEAC and for 77 polar secondary metabolites, respectively. Hotspots of stable QTL for health-related antioxidant compounds were detected on linkage groups LG IV-3, LG V-2 and V-4, and LG VI-1 and VI-2, where associated markers represent useful targets for marker-assisted selection of new varieties with increased levels of antioxidant secondary compounds. Moreover, differential expression of candidate genes for major and stable mQTLs was studied in fruits of contrasting lines in important flavonoids. Our results indicate that higher expression of FaF3′H, which encodes the flavonoid 3′-hydroxylase, is associated with increased content of these important flavonoids.


2021 ◽  
Vol 22 (11) ◽  
pp. 5710
Author(s):  
Vincent Ninkuu ◽  
Lin Zhang ◽  
Jianpei Yan ◽  
Zhenchao Fu ◽  
Tengfeng Yang ◽  
...  

Biodiversity is adversely affected by the growing levels of synthetic chemicals released into the environment due to agricultural activities. This has been the driving force for embracing sustainable agriculture. Plant secondary metabolites offer promising alternatives for protecting plants against microbes, feeding herbivores, and weeds. Terpenes are the largest among PSMs and have been extensively studied for their potential as antimicrobial, insecticidal, and weed control agents. They also attract natural enemies of pests and beneficial insects, such as pollinators and dispersers. However, most of these research findings are shelved and fail to pass beyond the laboratory and greenhouse stages. This review provides an overview of terpenes, types, biosynthesis, and their roles in protecting plants against microbial pathogens, insect pests, and weeds to rekindle the debate on using terpenes for the development of environmentally friendly biopesticides and herbicides.


2016 ◽  
Vol 1 (2) ◽  
pp. 55
Author(s):  
. Nurindah ◽  
Dwi Adi Sunarto ◽  
. Sujak

<p>Pengelolaan serangga hama dalam good agricultural practices (GAP) menerapkan cara-cara memproduksi tanaman yang berkualitas dengan menggunakan metode-metode pengelolaan serangga hama yang dapat meningkatkan keragaman genetik, keanekaragaman hayati dan habitatnya, serta terhadap struktur sosial dan komunitas pedesaan. Strategi ‘tolak-tarik’ (‘push-pull’ strategy) merupakan salah satu teknik pengenda-lian hama yang berprinsip pada komponen pengendalian non-toksik, sehingga dapat diintegrasikan dengan metode-metode lain yang dapat menekan perkembangan populasi hama dengan meningkatkan peran mu-suh alami pada pertanaman. Penelitian tanaman perangkap untuk pengendalian serangga tanaman temba-kau cerutu besuki dilaksanakan di Desa Antirogo, Kecamatan Sumbersari, Jember pada bulan Agustus–De-sember 2008. Pada penelitian ini digunakan tanaman jarak kepyar, sorgum, dan kacang hijau sebagai ta-naman penarik yang ditanam secara berlajur sebanyak satu atau dua baris di antara delapan baris tanaman tembakau. Sebagai pembanding adalah tanaman tembakau monokultur dengan penyemprotan insektisida secara berjadwal setiap empat hari sejak 10–50 HST dan petak kontrol, yaitu tanaman monokultur tanpa pe-ngendalian hama sama sekali. Penelitian disusun dalam rancangan acak kelompok dengan lima perlakuan yang diulang lima kali. Penelitian ini bertujuan untuk memilih tanaman perangkap yang dapat digunakan da-lam program pengendalian hama cerutu besuki secara terpadu. Hasil penelitian menunjukkan bahwa tanam-an jarak kepyar, sorgum, dan kacang hijau dapat digunakan sebagai tanaman perangkap, sehingga populasi hama pada tembakau dapat ditekan hingga 50% dan diperoleh produksi daun basah (8,62–9,17 ton/ha vs 8,42 ton/ha) dan kerosok (1,01–1,07 ton/ha vs 0,96 ton/ha) dengan mutu yang lebih baik dibandingkan kontrol (indeks mutu: 62,5–64,4 vs 62,1). Penggunaan kacang hijau memberikan produksi kerosok dengan mutu baik tertinggi, sehingga memberikan penerimaan yang lebih tinggi dibandingkan perlakuan lain. Pe-nyemprotan insektisida secara berjadwal untuk mengendalikan serangga hama tembakau cerutu besuki na-oogst merupakan tindakan pengendalian yang tidak efektif dan juga tidak efisien, karena sasaran serangga hama tidak tepat, sehingga terjadi pemborosan biaya input.</p><p> </p><p>Pest management in good agricultural practices concept use methods of qualified crop production processes with considering increasing genetic diversity, biodiversity and its habitat as well as social structure and village community. Push-and-pull strategy is a pest control method with a non-toxic method principal so that it can be integrated with other methods to suppress pest population and increase natural enemies’ populationin the ecosystems. Research on trap crops used for controlling insect pests on besuki-cigar tobaccowas conducted on besuki-cigar tobacco fields planted after rice (na-oogst) in Jember on August–December2008. In this research activity we used castor, sorghum, and mungbean as trap crops, each was intercroppedin one or two rows between eight rows of tobacco plants. We used monoculture tobacco plants withscheduled sprays of chemical insecticide, i.e. 4 days-spray interval on 10–50 days after planting and controlplots without any insect pest control for comparison with the use of trap crops. The research was arrangedin randomized block design with five treatments and five replicates. The aim of the research is to choose asuitable trap crop used in pest management of besuki cigar tobacco. The results showed that castor, sorghum,and mungbean could be use as trap crops to suppress insect pests population up to 25% on tobaccoplants and would give leaf production (1.01–1.07 ton/ha vs 0,96 ton cured leaves/ha) with a better quality(quality index: 62.5–64.4 vs 62.1) than those of control. Mungbean is the best trap crop as it gives a highestleaf production with a better quality, so that gives a better income than those of other treatments. Scheduledchemical insecticide sprays to control insect pest on na-oogst-besuki cigar tobacco was not either effectiveor efficient, because the target pest was not right, so that causing a wasteful input cost.</p>


2020 ◽  
Vol 10 (2) ◽  
pp. 252-262
Author(s):  
Vilmantas Pedišius

Secondary metabolites are the bioactive compounds of plants which are synthesized during primary metabolism, have no role in the development process but are needed for defense and other special purposes. These secondary metabolites, such as flavonoids, terpenes, alkaloids, anthraquinones and carotenoids, are found in Xanthoria genus lichens. These lichens are known as lichenized fungi in the family Teloschistaceae, which grows on rock and produce bioactive compounds. A lot of secondary compounds in plants are induced by UV (100-400 nm) spectra. The present review showcases the present identified bioactive compounds in Xanthoria elegans and Xanthoria parietina lichens, which are stimulated by different amounts of UV-B light (280-320 nm), as well as the biochemistry of the UV-B absorbingcompounds. 


Insects ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 471
Author(s):  
Nils Hiebert ◽  
Tobias Kessel ◽  
Marisa Skaljac ◽  
Marius Spohn ◽  
Andreas Vilcinskas ◽  
...  

Insect pests reduce global crop yields by up to 20%, but the most effective control measures are currently based on environmentally hazardous chemical pesticides. An alternative, ecologically beneficial pest-management strategy involves the use of microbial pathogens (or active compounds and extracts derived from them) that naturally target selected insect pests. A novel strain of the bacterium Leuconostoc pseudomesenteroides showed promising activity in our preliminary tests. Here, we investigated its effects in more detail, focusing on drosophilid and aphid pests by testing the survival of two species representing the family Drosophilidae (Drosophila suzukii and D. melanogaster) and one representing the family Aphididae (Acyrthosiphon pisum). We used oral and septic infection models to administer living bacteria or cell-free extracts to adult flies and aphid nymphs. We found that infection with living bacteria significantly reduced the survival of our insect models, whereas the administration of cell-free extracts had a significant effect only in aphids. These results confirm that L. pseudomesenteroides has potential as a new biocontrol agent for sustainable pest management.


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