Legume crops use their own unique genetic flowering clock
Henriques R, Benlloch R
Crop Improvement
The dry beans, peas, and soybeans you grow or cook with flower on a schedule tuned by genes unique to legumes, which is exactly why some varieties do better in your specific region than others.
Most flowering plants tell time using the same two genes to decide when day length is right to bloom. This review found that legumes like beans, soybeans, peas, and lupins often break that rule, using a different light sensor and a special gene called E1 instead. That flexibility likely helped different legume crops adapt to wildly different climates and latitudes as they spread around the world.
Key Findings
Legume-specific B3 domain transcription factors called E1 and E1-like proteins act as new regulators of photoperiodic flowering, diverging from the standard CONSTANS-FLOWERING LOCUS T module found in most other flowering plants
Phytochrome A, a light-sensing photoreceptor, plays a newly identified role in legume flowering time regulation
Findings span three major legume lineages: Galegoids (alfalfa, clover, pea), Phaseoloids (common bean, soybean, cowpea, pigeon pea), and the basal Genistoid clade (lupins), suggesting diversified flowering strategies helped different legumes adapt to varied environments and expand geographically
chevron_right Technical Summary
Scientists reviewing legume genetics found that beans, soybeans, peas, and their relatives don't all use the same internal calendar to decide when to flower. Instead of relying only on the classic gene pair found in most flowering plants, many legumes use a different light-sensing protein and a unique legume-specific gene switch, helping explain how these crops adapted to different growing regions worldwide.
Abstract Preview
Original paper
Beyond the CO-FT regulatory module: E1 and PHYA emerge as players in photoperiodic regulation of flowering in legumes.
The legume family (Fabaceae) is the third largest in plants and includes several crop species that are able to fix nitrogen, promote soil health, and contribute to food security worldwide. Recent p...
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