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Related Concept Videos

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Avoidance-avoidance conflict refers to a psychological situation where a person must choose between two or more unpleasant alternatives. These conflicts are particularly stressful because neither option is desirable. This dilemma is often expressed in sayings like "caught between a rock and a hard place" or "between the devil and the deep blue sea." For instance, individuals who fear dental procedures may find themselves torn between enduring a painful toothache or facing the...
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The shade-avoidance syndrome: multiple signals and ecological consequences.

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Plants use phytochrome B (phyB) to sense neighbors and adjust growth. New research reveals phyB also modulates plant immunity hormones, offering potential for crop improvement in dense plantings.

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Area of Science:

  • Plant biology
  • Photoreceptor signaling
  • Plant immunity

Background:

  • Plants detect neighbors using photoreceptors sensitive to light quality.
  • Phytochrome B (phyB) is key, responding to red (R) to far-red (FR) light ratios.
  • This sensing triggers adaptive growth responses, like increased elongation.

Purpose of the Study:

  • To review molecular links between plant proximity detection and growth responses.
  • To explore roles of other photoreceptors in competition.
  • To highlight phyB's emerging role in plant immunity pathways.

Main Methods:

  • Review of current understanding of phytochrome B signaling.
  • Analysis of molecular connections in Arabidopsis thaliana seedlings.
  • Examination of photoreceptor roles in growth and resource utilization.

Main Results:

  • Detailed mapping of connections between low R:FR signal and elongation growth.
  • Identification of phyB as a modulator of salicylic acid and jasmonic acid (JA).
  • Evidence for photoreceptor involvement in optimizing resource use.

Conclusions:

  • Phytochrome B is a crucial regulator of plant responses to competition.
  • Targeting phyB-hormone links, especially with JA, may enhance crop health under high density.
  • Understanding light signaling is vital for optimizing plant fitness and crop yields.