scholarly journals Silencing cathepsin L expression reduces Myzus persicae protein content and the nutritional value as prey for Coccinella septempunctata

2018 ◽  
Author(s):  
Imran Rauf ◽  
Muhammad Asif ◽  
Imran Amin ◽  
Rubab Zahra Naqvi ◽  
Noroza Umer ◽  
...  

AbstractGut-expressed aphid genes, which may be more easily inhibited by RNA interference (RNAi) constructs, are attractive targets for pest control efforts involving transgenic plants. Here we show that expression of cathepsin L, a cysteine protease that functions in aphid guts, can be reduced by expression of an RNAi construct in transgenic tobacco. The effectiveness of this approach is demonstrated by up to 80% adult mortality, reduced fecundity, and delayed nymph production of Myzus persicae (green peach aphids) when cathepsin L expression was reduced by plant-mediated RNAi. Consistent with the function of cathepsin L as a gut protease, M. persicae fed on the RNAi plants had a lower protein content in their bodies and excreted more protein in their honeydew. Larvae of Coccinella septempunctata (seven-spotted ladybugs) grew more slowly on aphids having reduced cathepsin L expression, suggesting that prey insect nutritive value, and not just direct negative effects of the RNAi construct, needs to be considered when producing transgenic plants for RNAi-mediated pest control.HighlightsSilencing expression of cathepsin L by RNA interference reduces protein content of Myzus persicae (green peach aphid) bodies.Honeydew of aphids with cathepsin L silenced contains elevated protein.Cathepsin L is required for efficient protein uptake from phloem sap.Aphids with cathepsin L expression silenced have increased mortality and fewer offspring.Coccinella septempunctata (seven-spotted ladybugs) grow more slowly on aphids with expression of cathepsin L silenced.

1954 ◽  
Vol 44 (2) ◽  
pp. 140-151 ◽  
Author(s):  
F. E. Moon

1. Examination of the composition of hay grown in the east of Scotland during the 4-year period 1948–51 has confirmed earlier work indicating the low protein content of this material. In addition, the digestibility of the protein was found to be low, particularly in the case of the seeds-hays, most of which contained insufficient digestible protein to balance the starch equivalent in meeting the maintenance requirements of cattle.2. In nutritive value the seeds -hays were markedly inferior to samples from England and Wales examined by other workers, but very similar to mature ryegrass hay grown in Northern Ireland. The meadow hays examined were of similar starch equivalent but somewhat richer in protein, and this was associated with a higher digestibility of the protein; in consequence the ratio between digestible protein and starch equivalent was more nearly balanced for the maintenance feeding of cattle.3. Applications of sodium nitrate or ‘Nitrochalk’ about 10–20 days before mowing produced very variable responses in the unusually dry season of 1949, but in other years significant increases in protein content were almost invariably obtained. Low protein seeds-hays of the type commonly found in the Lothians were more responsive to this fertilizer treatment than timothy meadow hay, and while increases in protein content of 20–30% were commonly obtained, when relatively heavy dressings of fertilizer (3 cwt. or more per acre) were used, increases in the region of 50% were sometimes recorded. In most years treatment about 10 days before mowing was fully effective in improving the protein content of the hay. Earlier treatment may be preferable in a very dry season, but in more normal years this may increase the yield of the hay and so diminish the effect on protein percentage.


2008 ◽  
Vol 19 (3) ◽  
pp. 252 ◽  
Author(s):  
O. NISSINEN ◽  
P. KALLIAINEN ◽  
L. JAUHIAINEN

The development of the yield and nutritive value of timothy (Phleum pratense L.) both in the primary growth and in the regrowth were studied at MTT Plant Production Research, a unit of MTT Agrifood Research Finland, in Rovaniemi (66°35´N) in 1999–2001. The dry matter yield and leaf:stem ratio were measured from the crop samples, and the contents of crude protein and organic matter digestibility of both whole plant samples and leaf and stem fractions were analysed. In primary growth, the most rapid increase of dry matter, 220–240 kg ha-1 per day, was measured around the beginning of the heading stage. There was a very strong positive correlation between the proportion of stems and the amount of dry matter in the primary yield. The daily growth rate of the regrowth was less than half of that of the primary growth. The fastest decrease, 1 percentage unit per day, in crude protein content was measured at the pasture stage (4–5-leaf stage). During the entire sampling period, the average daily decline in crude protein content in the primary growth of timothy was 0.65 percentage units. The main cause for the rapid decline in crude protein content was the high proportion of stem matter and its low protein content. In the regrowth, during the last four weeks before the harvest, the average daily decline in crude protein content was 0.28 percentage units.The average decline in organic matter digestibility from early pasture stage to late silage stage was 0.9 percentage units per day. The most remarkable change was noticed at the growth stage of timothy when about the half of stems were heading and it was then that the digestibility decreased by more than one percentage unit per day. The rapid decline in organic matter digestibility was due to the low digestibility of stem matter. The daily change in forage digestibility in the regrowth was very small, on average 0.11%.;


Author(s):  
Laura DALE ◽  
Ioan ROTAR ◽  
Vasile FLORIAN ◽  
Roxana VIDICAN ◽  
André THEWIS ◽  
...  

Medicago sativa or alfalfa is a flowering plant that belongs to Pea Family that is widely grown throughout the world as forage for cattle, and is most often harvested as hay. Usually, alfalfa has the highest nutritive value of all common hay crops. This work aims to highlight a way for direct, non-destructive analysis of crude protein content in alfalfa hays. The primary objective was to build a model for crude protein calibration for alfalfa based on FT-NIR spectroscopy. The samples for analysis were collected over two experimental years (2008-2009) from field trials from the research station– Agricultural Development, Cojocna. In order to construct the model, reference values are needed; for this reason, the crude protein content was determined using the classical Kjeldahl method (Kjeltec Auto Analyser, Tecator). The values for crude protein ranged from 12.63% to 19.12% on the dry matter basis. The regression model’s construction was based on Partial Least Squares (PLS) calculated with the SIMPLS algorithm, using different pre-processing techniques and leave-one-out cross validation. Calibration of the two years together drove to a coefficient of determination for cross validation, R2 of 0.965. The robustness of the model was confirmed by applying it to independent samples (external validation) where the coefficient of determination was R2 = 0.977, RMSEP = 0.8. The results obtained indicated that NIRS can be used to determine crude protein, which could be used as criteria for quality control of alfalfa hays.


2004 ◽  
Vol 84 (3) ◽  
pp. 785-790 ◽  
Author(s):  
Jianhong Yao, Xiuyun Zhao ◽  
Huaxiong Qi, Bingliang Wan ◽  
Fei Chen, Xiaofen Sun ◽  
Shanqian Yu ◽  
Kexuan Tang

Tobacco leaf discs were transformed with a plasmid, pBIAHA, containing the selectable marker neomycin phosphotransferase gene (nptII) and an Arisaema heterophyllum agglutinin gene (aha) via Agrobacterium tumefaciens-mediated transformation. Thirty-two independent transgenic tobacco plants were regenerated. PCR and Southern blot analyses confirmed that multiple copies of the aha gene had integrated into the plant genome. Northern blot analysis revealed that the aha gene was expressed at various levels in the transgenic plants. Insect bioassay test showed that transgenic plants expressing multiple copies of the aha gene reduced the rate of population increase of the peach potato aphid (Myzus persicae Sulzer). This is the first report that transgenic tobacco plants expressing the aha gene display enhanced resistance to aphids. Key words: Insect bioassay, Arisaema heterophyllum agglutinin, transformation, transgenic tobacco, peach potato aphid (Myzus persicae Sulzer)


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nicolas Bensoussan ◽  
Sameer Dixit ◽  
Midori Tabara ◽  
David Letwin ◽  
Maja Milojevic ◽  
...  

Abstract Comprehensive understanding of pleiotropic roles of RNAi machinery highlighted the conserved chromosomal functions of RNA interference. The consequences of the evolutionary variation in the core RNAi pathway genes are mostly unknown, but may lead to the species-specific functions associated with gene silencing. The two-spotted spider mite, Tetranychus urticae, is a major polyphagous chelicerate pest capable of feeding on over 1100 plant species and developing resistance to pesticides used for its control. A well annotated genome, susceptibility to RNAi and economic importance, make T. urticae an excellent candidate for development of an RNAi protocol that enables high-throughput genetic screens and RNAi-based pest control. Here, we show that the length of the exogenous dsRNA critically determines its processivity and ability to induce RNAi in vivo. A combination of the long dsRNAs and the use of dye to trace the ingestion of dsRNA enabled the identification of genes involved in membrane transport and 26S proteasome degradation as sensitive RNAi targets. Our data demonstrate that environmental RNAi can be an efficient reverse genetics and pest control tool in T. urticae. In addition, the species-specific properties together with the variation in the components of the RNAi machinery make T. urticae a potent experimental system to study the evolution of RNAi pathways.


2012 ◽  
Vol 1 (2) ◽  
Author(s):  
Haslina Haslina ◽  
Siti Fatimah Muis ◽  
Suyatno Suyatno

ABSTRACT Introduction: Patilo is one of traditional various snacks from Gunung Kidul that is made of fermented cassava waste and cassava starch. Fermentation is intended to reduce or eliminate the HCN content of cassava and to establish special flavour. The protein content of patilo is very low, therefore it can be enriched with animal protein from fresh water fish in form of fish flour or fish protein hydrolysate (FPH). Enrichment with fish protein hydrolysate has an advantage since it will be easier to digest by human because FPH better functional properties and higher solubility.Method: The study consisted of four activities that were 1) making/producing mujair FPH, 2) producing and enriched patilo with mujair FPH, 3) analyzed the nutritive values and protein digestibility of enriched and unenriched patilo and 4) analyzed the consumers acceptability of the products. The experiments were carried out in the 1) Food Engineering and Chemistry Laboratorium of Faculty of Agriculture Technology Semarang University, 2) Pilot Plan PAU and GMSK Laboratory of Bogor Institute of Agriculture, 3) Sidoardjo Village, Tepus Gunung Kidul. Variables being studied were nutritive value and protein digestibility of unenriched and enriched patilo with mujair FPH in several consumer acceptability in terms of flavour, taste, colour and texture. The study design was a complete random design of one factor in which the FPH was added in 5%, 10% and 15% concentration, each treatment repeated 3 times. Statistical analyses used for nutritive value and protein digestibility were Anova followed by Least Significant Difference test with 0,05 level of significancy Friedman and Wilcoxon Sign Rank test were used to test the organoleptic values both in the laboratory and in the field. Result:1) The nutritive value changes of raw enriched patilo were : a) significant decrease in water and carbohydrate content, b) significant increase in ash, fat and protein content compared to the unenriched patilo, 2) The nutritive value change of fried enriched patilo were : a) significant decrease in water and carbohydrate content, b) significant increase in fat, protein and energy content compared to the unenriched patilo, 3) The protein digestibility in raw and fried enriched patilo was significant higher than that without enrichement, 4) Patilo enriched with 10% mujair FPH was mostly liked by consumer either in the laboratory or in the field in term of taste, flavour and texture as for colour, all consumers prefered the unenriched patilo, 5) The changes of the nutritive values and protein digestibility were statistically significant in the enriched patilo, however from the nutrition point of view, only the increased of protein content (six folds increase) was meaningful. Conclusion: Patilo enriched with 10% mujair FPH is the most/well accepted by laboratory panelists and field consumers, and there was six folds increase in the protein content.   Key Word: Patilo, enrichment and fish protein hydrolysate.   ABSTRAK   Latar Belakang: Patilo adalah salah satu makanan jajanan tradisional Gunung Kidul yang diolah dari ampas singkong yang difermentasi dan dicampur dengan pati singkong. Kandungan protein dalam patilo sangat rendah, untuk itu perlu diperkaya antara lain dengan sumber protein hewani dari ikan air tawar baik dalam bentuk tepung ikan atau hidrolisat protein ikan (HPI). Tujuan: Penelitian ini bertujuan untuk 1). menganalisis nilai gizi patilo 2). menganalisis daya cerna protein patilo 3). menganalisis daya terima patilo goreng tanpa dan dengan penambahan HPI mujair Metode: Penelitian ini terdiri dari empat kegiatan yaitu: 1). pembuatan HPI mujair, 2). pembuatan dan pengkayaan patilo dengan HPI mujair, 3). pengujian nilai gizi dan daya cerna protein patilo tanpa dan dengan penambahan HPI mujair dan 4). uji penerimaan patilo baik di laboratorium maupun di lapangan. Variabel yang diamati adalah kandungan gizi patilo dan daya cerna protein patilo. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap dengan 1 faktor yaitu HPI0=tanpa penambahan HPI, HPI1= penambahan HPI 5% dari berat ampas (b/b), HPI2=penambahan HPI 10 % dari berat ampas (b/b) dan HPI3=penambahan HPI 15% dari berat ampas (b/b), masing-masing perlakuan diulang sebanyak tiga kali. Analisis kandungan gizi dan daya cerna patilo dengan Anova, uji dilanjutkan dengan uji Least Significant Difference (LSD) pada taraf dan 5%. Untuk analisis uji organoleptik baik di laboratorium maupun di lapangan dengan uji Friedman. Perbedaan hasil akan dilanjutkan dengan uji lanjut Wilcoxon Sign Rank Test. Hasil: 1) Nilai gizi patilo mentah dengan penambahan HPI mujair dibandingkan tanpa penambahan HPI mujair adalah : a) terjadi penurunan kadar air dan kadar karbohidrat secara signifikan (ρ<0,05) dan b) terjadi peningkatan kadar abu, kadar lemak dan kadar protein secara signifikan (ρ<0,05), 2) Nilai gizi patilo goreng dengan penambahan HPI mujair dibandingkan tanpa penambahan HPI mujair adalah : a). terjadi penurunan kadar air dan kadar karbohidrat secara signifikan (ρ<0,05) dan b).terjadi peningkatan kadar lemak, kadar protein dan energi secara signifikan (ρ<0,05) 3). Daya cerna protein patilo mentah dan goreng dengan penambahan HPI mujair meningkat secara signifikan (ρ=0,000) dibandingkan tanpa penambahan HPI mujair pada semua konsentrasi, 4). Patilo dengan penambahan HPI mujair 10% paling disukai oleh panelis agak terlatih dan panelis konsumen anak sekolah berdasarkan skor rasa, bau dan tekstur. Untuk warna, panelis agak terlatih dan panelis konsumen anak sekolah memilih patilo tanpa penambahan HPI mujair dan 5). Secara statistik perubahan nilai gizi dan daya cerna protein bermakna kecuali untuk kadar abu patilo goreng, namun dari sudut gizi perubahan yang berarti hanya pada kadar protein yang mencapai 6 kali lipat. Simpulan: Patilo yang diperkaya dengan HPI mujair 10% paling disukai oleh panelis agak terlatih maupun panelis konsumen anak sekolah dan terjadi kenaikan secara signifikan pada kadar protein yang mencapai 6 kali lipat. Kata Kunci : Patilo, pengkayaan dan hidrolisat protein ikan    Permalink : http://ejournal.undip.ac.id/index.php/jgi/article/view/3243  


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