Related Experiment Video
Updated: Feb 3, 2026
07:44
Analysis of Fatty Acid Content and Composition in Microalgae
Published on: October 1, 2013
61.6K
BpbZIP61 negatively regulates drought resistance in birch by reducing ascorbic acid content.
Wenfang Dong1, Jiaojiao Wang1, Xinyu Wang1
1State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Harbin 150040, China.
Summary
Birch trees have a gene, BpbZIP61, that reduces drought tolerance. This gene lowers antioxidant levels and ascorbic acid, hindering survival during dry conditions and impacting tree breeding.
Area of Science:
- Plant Biology
- Molecular Genetics
- Forestry
Background:
- Drought stress significantly limits forest productivity and survival.
- Basic leucine zipper (bZIP) transcription factors are crucial for plant stress responses.
Purpose of the Study:
- To investigate the role of BpbZIP61, a drought-induced bZIP transcription factor in birch (Betula platyphylla), in drought tolerance.
- To elucidate the molecular mechanisms underlying BpbZIP61's function in drought response.
Main Methods:
- Gene expression analysis (transcriptomics).
- Biochemical assays for reactive oxygen species, malondialdehyde, and enzyme activities (Superoxide Dismutase, Peroxidase).
- Analysis of ascorbic acid content and gene promoter binding assays.
Main Results:
- Overexpression of BpbZIP61 increased water loss, reactive oxygen species, and malondialdehyde levels.
- BpbZIP61 overexpression decreased antioxidant enzyme activities and ascorbic acid content.
- BpbZIP61 directly represses the expression of BpGGLO6, a gene in the ascorbic acid biosynthesis pathway.
Conclusions:
- BpbZIP61 acts as a negative regulator of drought tolerance in birch.
- The mechanism involves suppressing ascorbic acid biosynthesis and altering antioxidant enzyme activity.
- Findings provide insights for developing drought-resistant birch varieties through molecular breeding.
More Related Videos
Related Concept Videos
02:41Responses to Drought and Flooding
12.1K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
12.1K
01:23Negative Regulator Molecules
38.5K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.5K
03:38Polyprotic Acids
32.0K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
32.0K
01:18Respiratory Regulation of Acid-Base Balance
1.7K
Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2 and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are...
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are...
1.7K
01:29Renal Regulation of Acid-Base Balance
1.7K
Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
1.7K
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
2.7K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.7K