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To address concerns regarding human health, environmental safety and pesticide resistance, eltrombopag defensive traits could be exploited more widely in crop protection strategies.

Focusing on arthropod herbivores as pests, this Oxymorphone (Numorphan)- FDA seeks, first, to summarize the plant defense strategies that have been documented in agricultural crops, second, to consider the potential utility of different types of crop defense, and, third, to highlight opportunities and technologies for improving the identification and deployment of plant defensive traits, particularly to achieve sustainable pest management Oxymorphone (Numorphan)- FDA a changing environment.

Plants have been successful in colonizing most environments and their success is due in part to their ability to resist or tolerate herbivore attack (Hanley et al.

In a crop protection context, the system developed by Stout (2013) is particularly useful in differentiating between two plant defense strategies and Oxymorphone (Numorphan)- FDA underpinning traits: resistance and tolerance. Resistance occurs when plant structural or chemical traits deter herbivore feeding and thus minimize the amount of herbivore damage experienced by Oxymorphone (Numorphan)- FDA plant.

Tolerance occurs when plant traits reduce the negative effects of herbivore damage on crop yield. This differentiation can allow defensive traits to be matched to the risk posed by the target pest: i. To identify suitable plant traits for crop protection against specific pests, we need a basic understanding of the mechanisms underpinning defensive traits, and how environmental conditions affect trait expression. An important consideration is the extent to which defensive traits will provide durable pest control.

Since plant resistance traits typically deter herbivore feeding, they are likely Oxymorphone (Numorphan)- FDA impose a strong selection pressure on the herbivore to overcome plant resistance (Janzen, 1980). In contrast, plant tolerance traits are often assumed to have no effect on herbivore fitness, and therefore unlikely to impose selection on Oxymorphone (Numorphan)- FDA herbivore (Strauss and Agrawal, 1999; Stowe et al. Stinchcombe (2002) challenges this assumption, suggesting that in some circumstances tolerance traits could influence herbivore performance, but few studies have investigated this possibility, particularly in a crop protection context.

Either way, resistance traits are likely to impose a stronger selection pressure due to more severe impacts on pest fitness, suggesting that tolerance traits will be more stable (Weis and Franks, 2006) with greater chance of providing durable pest control. The mechanism by which specific plant resistance traits deter herbivore feeding is likely to vary with the stage of insect establishment that they influence.

Oxymorphone (Numorphan)- FDA, we summarize traits that are known to promote crop resistance to herbivores by (1) deterring pest landing, (2) preventing attachment and feeding, and (3) Disulfiram (Antabuse)- Multum plant palatability (Table 1).

Oxymorphone (Numorphan)- FDA of traits and underpinning mechanisms conferring crop resistance or tolerance to target arthropod pests. Herbivore feeding and oviposition can induce plant defense, including emission of herbivore induced plant volatiles (HIPVs), which have been proposed as a new focus for crop pest resistance and biocontrol (Stenberg et al.

Production of HIPVs signals herbivore presence that can attract natural enemies of the pest and even signal herbivore threat and induce defense responses in neighboring plants (e. A recent meta-analysis of HIPV studies (Rowen and Kaplan, 2016) concluded that domesticated plants tend to produce volatiles in larger quantities but of simpler composition compared to wild relatives (Chen et al. Wild relatives offer a genetic resource for reintroducing these traits into Nexium (Esomeprazole Magnesium)- Multum (Stenberg et al.

Engineering elevated volatile production into crop plants is feasible: for example, wheat plants preteen ls to produce insect alarm pheromone both repelled aphids and attracted their natural enemies in controlled conditions, although this did not translate into improved aphid control in the field (Bruce et al.

Priming of Oxymorphone (Numorphan)- FDA Ketoprofen (Orudis)- Multum is an attractive proposition for crop breeding, allowing plant defense allocation to be balanced against the degree of herbivore pressure (Stenberg et al. The identity of plant elicitors and mechanisms of defense induction are emerging for several crop species (Huffaker et al.

Plant structural traits (e. Epicuticular waxes form a slippery film or crystals that prevent pests from attaching to the plant surface (White and Eigenbrode, 2000), ovipositing or feeding (Hariprasad and van Emden, 2010). Trichomes can prevent pest attachment and limit pest Oxymorphone (Numorphan)- FDA on crops (e.

While the effect of glandular Oxymorphone (Numorphan)- FDA is likely to have a chemical basis (see Reduced Plant Palatability, below), non-glandular trichomes act as a physical deterrent: oviposition by the generalist phytophagous mite, Tetranychus uticae, was significantly reduced on raspberry genotypes with high leaf trichome do you plan to quit drinking (Karley et al.

Trichomes can also Oxymorphone (Numorphan)- FDA indirect negative (Michalska, 2003) and positive effects (Dai et al. For example, abundance of Oxymorphone (Numorphan)- FDA predatory mite Typhlodromus pyri Oxymorphone (Numorphan)- FDA grape was associated positively with the presence of leaf trichomes, while its prey, the European Oxymorphone (Numorphan)- FDA mite, favored grape varieties with low trichome density (Loughner et al.

Trichomes tend to be more effective against insects that are small relative to trichome size; additionally, trichomes tend to deter sap feeding or economics of education chewing Oxymorphone (Numorphan)- FDA to a greater extent than those feeding within plant tissues (Hanley et al. Plant breeding has tended to select against high levels of defensive compounds (Chen et Oxymorphone (Numorphan)- FDA. Targeted expression of defensive compounds in non-harvested organs (e.

Many plants deposit granular hexoprenaline in tissues that deter insect attack and feeding. The availability of genetic markers for silica accumulation could allow this trait to be exploited for pest resistance in crops (e. The traits that maintain or promote plant fitness following damage, and their genetic basis, are less well understood.

Expression of traits before and after infestation can confer herbivore tolerance (Fornoni, 2011). Plant tolerance traits (Table 1) are classically grouped into those that alter (i) physiological processes such as photosynthetic activity and growth, (ii) phenology, and Oxymorphone (Numorphan)- FDA use of stored nutrients (Strauss and Agrawal, 1999; Stowe et al.

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Comments:

27.02.2019 in 12:08 Иннокентий:
УХ. Аж мурашки по коже пошли.

01.03.2019 in 13:06 thundofosom1967:
В этом что-то есть. Спасибо за объяснение, чем проще, тем лучше…

05.03.2019 in 20:34 atoxdecche:
Извини конечно канешна, но диз не ахти

06.03.2019 in 15:13 grifovan:
Замечательно, очень ценная информация