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Related Experiment Videos

Apple leaf senescence: leaf disc compared to attached leaf.

P W Spencer1, J S Trrus

  • 1Department of Horticulture, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801.

Plant Physiology
|January 1, 1973
PubMed
Summary
This summary is machine-generated.

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Biochemical and Enzymatic Changes in Apple Leaf Tissue during Autumnal Senescence.

Plant physiology·1972

Apple leaf senescence involves protein loss starting in early August. Detached leaf discs showed protein gain before this date, but later, protein loss in discs matched attached leaves, while chlorophyll loss accelerated significantly.

Area of Science:

  • Plant Physiology
  • Biochemistry
  • Agricultural Science

Background:

  • Leaf senescence is a complex process involving biochemical changes.
  • Understanding senescence in fruit trees like apples (Pyrus malus L.) is crucial for agricultural management.
  • Detached leaf assays are common methods to study senescence under controlled conditions.

Purpose of the Study:

  • To investigate the timing and characteristics of senescence in Golden Delicious apple leaves.
  • To compare senescence patterns in attached leaves versus detached leaf discs.
  • To determine the influence of light conditions on leaf disc senescence.

Main Methods:

  • Monitoring protein and chlorophyll content in attached apple leaves throughout the growing season.
  • Preparing leaf discs from detached leaves and measuring their biochemical changes over time.

Related Experiment Videos

  • Incubating leaf discs under different light conditions (darkness vs. 12-hour light).

    • Main Results:

    • Attached apple leaves initiated protein loss in early August, signaling the onset of senescence.
    • Detached leaf discs from pre-senescent leaves initially gained protein for up to 7 days.
    • Chlorophyll loss in leaf discs commenced over two months earlier than in attached leaves and preceded protein loss in discs.

    Conclusions:

    • Detached apple leaf discs exhibit distinct senescence patterns compared to attached leaves, particularly regarding chlorophyll degradation.
    • Light conditions had minimal impact on the senescence rate of pre-senescent leaf discs.
    • Apple leaf discs showed relatively lower rates of protein and chlorophyll loss compared to other species studied.