New understanding of light detection in plants may revolutionize farming
How photoreceptors influence plant seedlings
Photoreceptors are proteins that plants use to sense light and make growth-related decisions. They play a pivotal role in determining when a seedling should stop elongating, begin photosynthesis, and channel energy into survival and development.
Until now, scientists understood these broad functions but lacked clarity about where in the seedling the photoreceptors acted.
“For the first time, we realized that the effect of these photoreceptors is not everywhere along the stem and that different photoreceptors control different regions of the stem,” explained Edgar Spalding, professor emeritus of botany at UW–Madison.
To unravel this mystery, Spalding, doctoral student Julian Bustamante, and data scientist Nathan Miller used a combination of techniques including genetic manipulation, high-resolution imaging, and machine learning.
The team photographed the growth of tiny seedlings with highly sensitive cameras and analyzed the data using UW–Madison’s advanced computing resources. This approach allowed them to pinpoint how specific photoreceptors influence distinct parts of the plant stem.
Light detection and plant survival
One of the most fascinating discoveries from this research is the critical role of the photoreceptor CRY1 in helping seedlings survive environmental challenges.
When a seedling first emerges from the soil, it uses stored energy to elongate its stem and reach sunlight, where it can begin photosynthesis.
However, sometimes seedlings are covered again by soil due to wind, animals, or other environmental factors. Without sunlight, they can no longer produce energy through photosynthesis.
CRY1 acts as a kind of survival mechanism. Initially, it prevents the plant from overextending its stem, conserving energy and leaving some growth potential in reserve. If the seedling gets buried again, CRY1 signals the plant to elongate further until it breaks through the soil and reaches sunlight once more.
This discovery is particularly significant for “stand establishment” – the phase when seedlings take root and begin to grow. Stand establishment is a critical determinant of crop success, and understanding how CRY1 functions during this period could help farmers enhance the resilience of their plants.
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