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Cloning and molecular characterization of a myosin light chain gene from Puccinia striiformis f. sp. tritici
Jie Liu1, Li-Na Han, Qiong Zhang
1State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, 712100, Shaanxi, China.
Abstract:
The fungus Puccinia striiformis f. sp. tritici (Pst), the causal agent of wheat stripe rust, is an obligate biotrophic basidiomycete. Many studies have found that myosins play important roles during fungal growth and propagation. However, there are few reports on the myosins of Pst. In this study, we cloned and obtained the myosin light chain gene PsMLC1 from Pst and characterized its expression. Furthermore, the function of PsMLC1 was identified by mutant complementation. As a result, we found that expression of PsMLC1 in Schizosaccharomyces pombe mostly complemented the defects of the cdc4 mutant, indicating that PsMLC1 belongs to the myosin light chain family member. Expression studies showed that the transcript levels of PsMLC1 little changed before 24 h post inoculation then was suddenly down-regulated during Pst infection of wheat. By using ML-7, we observed that inactivity of PsMLC1 greatly reduced the germination rate of urediniospores. These results suggest that PsMLC1 is essential for the early stages of Pst infection of wheat but unnecessary for the later stages of infection. This work elucidates the function of the myosins in Pst and may provide some theoretical basis for controlling strip rust.
Insights
Researchers identified the myosin light chain gene PsMLC1 in Puccinia striiformis f. sp. tritici (Pst), the wheat stripe rust fungus. PsMLC1 is crucial for early Pst infection stages, impacting urediniospore germination.
Area of Science:
- Fungal genetics and molecular biology
- Plant pathology
- Biochemistry
Background:
- Puccinia striiformis f. sp. tritici (Pst) causes wheat stripe rust, impacting global food security.
- Myosins are vital for fungal development, but their roles in Pst remain largely uncharacterized.
- Understanding Pst-specific proteins is key to developing effective disease control strategies.
Purpose of the Study:
- To clone and characterize the myosin light chain gene PsMLC1 from Pst.
- To elucidate the functional role of PsMLC1 in Pst infection of wheat.
- To investigate the potential of PsMLC1 as a target for controlling wheat stripe rust.
Main Methods:
- Gene cloning and expression analysis of PsMLC1 in Pst.
- Functional complementation of a Schizosaccharomyces pombe cdc4 mutant using PsMLC1.
- Inhibition of PsMLC1 activity using ML-7 to assess its impact on urediniospore germination.
Main Results:
- PsMLC1 was successfully cloned and its expression characterized.
- PsMLC1 functionally complemented the cdc4 mutant in S. pombe, confirming its identity as a myosin light chain.
- PsMLC1 transcript levels were downregulated during later stages of wheat infection.
- Inhibition of PsMLC1 significantly reduced urediniospore germination rates.
Conclusions:
- PsMLC1 is essential for the early stages of Pst infection, particularly urediniospore germination.
- PsMLC1 is dispensable for later stages of Pst infection in wheat.
- This study provides insights into myosin function in Pst and potential targets for rust management.
