9 Matching Annotations
  1. Aug 2018
    1. . The dynamic response of stomata or gs to fluctuations in light intensity has been studied in several understorey forest-dwelling species, but relatively few reports have studied crop species (Chazdon and Pearcy, 1986; Chazdon, 1991; Tinoco-Ojanguren and Pearcy, 1993; Leakey et al., 2005; McAusland et al., 2016).
    2. Efforts to develop a big data approach to photosynthetic phenomics by recruiting many researchers into online cloud-based initiatives (Kuhlgert et al., 2016) may be promising because not only can they assay many genotypes but they can also do so under the diverse conditions which plants experience in nature.
    3. However, the importance of the dynamic responses of photosynthesis raises a key problem that has not been adequately addressed: it is difficult to capture photosynthetic responses within (rapidly) fluctuating environments, especially in the field.

      The Challenge

    4. Whilst morphological adaptations to such extreme temperature fluctuations are well documented, the physiological adjustments are not (Hedberg, 1970).

      Gap in knowledge

    5. Indeed, it is particularly important that light is accurately tracked by the plant for optimal photosynthetic performance

      This would suggest that chloroplast movement, which is relatively slow, could be a limiting factor of photosynthesis.

    6. ‘photosynthome’

      Phenome of photosynthesis

    7. Indeed, we are beginning to understand that the way in which photosynthesis is regulated in response to fluctuations in the environment is perhaps a more important determinant of plant productivity than its performance under steady-state or temporarily steady-state conditions

      Other ways of measuring photosynthesis are needed.

  2. Dec 2016
    1. Inference: Leaves show great variations to spread chloroplast over a large surface area to maximize light absorption. At the same time, internal leaf structure needs to optimize carbon exchange. Especially since carbon fixation is rate limiting. Therefore, there should be a relationship between leaf area and leaf structure. How strong is this relationship?

    2. How then can leaves cope?
      1. Chloroplast arrangement
      2. Biochemistry
      3. Leaf orientation