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Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce Lactuca sativa Germplasm Collections

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How portulaca seedlings avoid their neighbours.

Ariel Novoplansky¹, Dan Cohen¹, Tsvi Sachs¹

¹Department of Botany, The Hebrew University of Jerusalem, Berman Building, 91904, Jerusalem, Israel.

|March 18, 2017

Summary

This summary is machine-generated.

Portulaca oleracea seedlings avoid neighbors by sensing light cues, not just proximity. They use far-red light direction to predict future shade, guiding growth away from potential competition.

Keywords:

Developmental plasticity Environmental signals Far-red light Phytochrome Plant competition Portulaca oleracea L.

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Area of Science:

Plant biology
Photomorphogenesis
Plant sensory mechanisms

Background:

Seedlings of Portulaca oleracea exhibit directional growth responses.
The ability of plants to perceive and respond to neighbors is crucial for resource competition.
Light quality and direction are known environmental cues influencing plant development.

Purpose of the Study:

To investigate the directional growth responses of Portulaca oleracea seedlings to neighbors.
To determine if spectral characteristics of light influence seedling directional growth.
To understand how Portulaca seedlings use light cues to anticipate future shading.

Main Methods:

Seedlings were exposed to simulated neighbors (plastic rectangles with leaf-like spectral properties).
Light conditions were manipulated, including equal intensity from all directions and varying far-red light.
Growth direction of seedlings in response to different light stimuli was observed and measured.

Main Results:

Portulaca oleracea seedlings did not exhibit directional growth towards neighbors, regardless of neighbor size or distance.
Seedlings responded to light cues, specifically avoiding directions with higher far-red light when light intensity was uniform.
Mature plants did not respond to non-photosynthetically active objects, indicating a reliance on light quality.

Conclusions:

Portulaca oleracea seedlings utilize spectral composition and direction of light as indicators of potential shade.
This sensory mechanism allows seedlings to proactively adjust growth direction to avoid future competition.
The findings highlight the sophisticated light-sensing capabilities of plants for survival and resource acquisition.