Harnessing GhGRDP1 natural variation for enhanced cotton seed yield: a rhamnose-dependent strategy in breeding.
Zhao Y, Wu H, Zhao T, Huang S, Hao Y
Summary
PubMedWhy it matters This matters because cotton seeds are crushed into cottonseed oil used in cooking and food products worldwide, so breeding bigger, heavier seeds means more oil and food from the same farmland.
Researchers found that a tiny one-letter change in a cotton plant's DNA causes some cotton varieties to produce smaller seeds than others. The gene affected by this change normally helps build the walls of cells inside developing seeds by activating a helper protein. When scientists used gene-editing tools to boost this gene's activity in cotton, rice, and a common lab plant, all three grew larger, heavier seeds — suggesting this is a universal 'seed size dial' shared across flowering plants.
chevron_right Technical Details
Scientists discovered a single missing DNA letter in a cotton gene (GhGRDP1) that controls seed size and yield. By understanding this natural variation and the gene's mechanism — activating a sugar-making enzyme — researchers can now breed higher-yielding cotton without sacrificing fiber quality.
Key Findings
A single 1-base-pair deletion in the eighth section of the GhGRDP1 gene triggers a cellular cleanup mechanism that degrades the gene's instructions, directly reducing seed size and lint percentage in upland cotton.
GhGRDP1 boosts seed weight by activating UDP-L-rhamnose synthase (GhRHM1), an enzyme that builds cell wall components in developing ovules, linking sugar metabolism to seed growth.
The gene's key functional domain (sGRD) is conserved across flowering plants — CRISPR-edited versions improved seed size in cotton, rice, and Arabidopsis — making it a broad target for multi-crop yield improvement.
Abstract Preview
Breeding high-yield crops has long been a fundamental goal in global agriculture, with seeds serving as the essential vehicle to achieve this aim. Therefore, understanding the regulatory mechanisms...
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