Q: 在作物基因改造中，通常靶向哪个基因以提升抗旱能力？ - Parker Core Knowledge

Understanding the Context

Scientists commonly focus on several gene families to boost a plant’s ability to withstand dry conditions. Among the most significant targets are:

1. DREB and DREB2 Genes (Dehydration-Responsive Element-Binding Proteins)
   These transcription factors play a central role in activating stress-responsive genes when plants experience water deficit. Overexpressing DREB1A in crops like rice and wheat has been shown to significantly increase drought tolerance by regulating stomatal closure and expression of protective proteins.

2. NCED Genes (Natural Catalase-like Oxidoreductase)
   NCED genes are involved in the biosynthesis of abscisic acid (ABA), a key plant hormone that mediates drought response by closing stomata to reduce water loss. Modulating NCED expression helps fine-tune ABA levels, balancing growth and stress defense without impairing yield under normal conditions.

3. Genes Involved in Root Architecture—such as DRO1 (Deeper Rooting 1)
   In rice, the DRO1 gene promotes deeper root growth, enabling plants to access moisture from deeper soil layers during drought. Selective breeding and gene editing have promoted variants of DRO1 to develop more resilient root systems.

Key Insights

4. LEA (Late Embryogenesis Abundant) Proteins
   These stress-protective proteins accumulate during dehydration, helping stabilize cellular structures and enzymes. Enhancing LEA gene expression supports cellular integrity under water stress, particularly in seeds and critical growth tissues.

5. Aquaporin Genes
   Aquaporins regulate water movement across cell membranes. Engineering these genes can optimize water transport efficiency in drought conditions, supporting plant hydration without excessive water expenditure.

Why Target Multiple Genes?
Drought tolerance is a complex trait involving numerous interconnected pathways. Modern genetic approaches often employ multiplexed gene editing—using CRISPR or transgenic methods—to simultaneously enhance several drought-related genes, resulting in more robust and resilient crops.

Future Outlook
As genomic tools advance, identifying and precisely targeting drought-responsive genes will be central to developing sustainable, high-yielding crops for arid and volatile climates. These genetic innovations not only safeguard food security but also reduce farming’s environmental footprint.

Final Thoughts

Summary:
In crop genetic modification, the DREB, NCED, DRO1, LEA, and aquaporin genes are among the most frequently targeted to improve drought resistance by regulating stress responses, root architecture, and cellular protection. Combining these strategies offers promising pathways to climate-resilient agriculture.

Keywords: crop genetic modification, drought resistance genes, DREB genes, abscisic acid, root engineering, abiotic stress tolerance, CRISPR crop improvement
Meta description: Learn which genes are commonly targeted to enhance drought resistance in genetically modified crops, including DREB, NCED, and DRO1, and how these advances support climate-resilient agriculture.