Cutin and Wax Biosynthesis in Cannabis sativa: Unveiling the Jasmonate-Dependent Mechanisms of Metal-Induced Changes in Leaf Cuticle Composition and Water Transport Prope

* *Cutin and Wax Biosynthesis in Cannabis sativa: Unveiling the Jasmonate-Dependent Mechanisms of Metal-Induced Changes in Leaf Cuticle Composition and Water Transport Properties**

# Abstract

This study aimed to elucidate the molecular mechanisms by which metal ions regulate cutin and wax biosynthesis in plant leaves, influencing their water transport properties and adaptation to abiotic stress conditions. We assessed the effects of cadmium (Cd) and zinc (Zn) on dichlorfenilacetic acid-tolerant cultivars of Cannabis sativa, focusing on jasmonate-dependent cutin polymerization and wax ester biosynthesis. Our results showed that Cd and Zn exposure altered leaf cuticle composition, leading to enhanced water transport properties and improved abiotic stress tolerance.

* *Introduction**

Cannabis sativa is a versatile crop with a wide range of applications, including medicinal, recreational, and industrial uses. The plant's ability to synthesize cutin and wax is crucial for its water transport properties and adaptation to abiotic stress conditions. Jasmonates, a class of plant hormones, play a key role in regulating cutin and wax biosynthesis in response to environmental stimuli. In this study, we investigated the effects of cadmium (Cd) and zinc (Zn) on dichlorfenilacetic acid-tolerant cultivars of Cannabis sativa, focusing on jasmonate-dependent cutin polymerization and wax ester biosynthesis.

* *Methods**

We used a hydroponic system with a peat-based substrate to grow dichlorfenilacetic acid-tolerant cultivars of Cannabis sativa. The plants were exposed to different concentrations of Cd and Zn (0, 50, 100, and 200 μM) for 14 days. Leaf samples were collected at the end of the treatment period for analysis of cutin and wax composition, water transport properties, and jasmonate levels.

* *Results**

Our results showed that Cd and Zn exposure altered leaf cuticle composition, leading to enhanced water transport properties and improved abiotic stress tolerance. The effects of Cd and Zn on cutin and wax biosynthesis were dose-dependent, with higher concentrations leading to more pronounced changes. We observed a significant increase in jasmonate levels in response to Cd and Zn exposure, which was correlated with enhanced cutin and wax biosynthesis.

* *Key Findings**

1. Cd and Zn exposure altered leaf cuticle composition, leading to enhanced water transport properties and improved abiotic stress tolerance.

2. The effects of Cd and Zn on cutin and wax biosynthesis were dose-dependent, with higher concentrations leading to more pronounced changes.

3. Jasmonate levels increased in response to Cd and Zn exposure, which was correlated with enhanced cutin and wax biosynthesis.

* *Botanical Mechanisms**

Cutin and wax biosynthesis in Cannabis sativa is regulated by a complex network of signaling pathways, including the jasmonate pathway. Jasmonates play a key role in regulating cutin and wax biosynthesis in response to environmental stimuli, such as stress and metal exposure. Our results suggest that Cd and Zn exposure activates the jasmonate pathway, leading to enhanced cutin and wax biosynthesis.

* *Methods/Diagnostics**

We used a hydroponic system with a peat-based substrate to grow dichlorfenilacetic acid-tolerant cultivars of Cannabis sativa. The plants were exposed to different concentrations of Cd and Zn (0, 50, 100, and 200 μM) for 14 days. Leaf samples were collected at the end of the treatment period for analysis of cutin and wax composition, water transport properties, and jasmonate levels.

* *Interpretation**

Our results suggest that Cd and Zn exposure alters leaf cuticle composition, leading to enhanced water transport properties and improved abiotic stress tolerance. The effects of Cd and Zn on cutin and wax biosynthesis are dose-dependent, with higher concentrations leading to more pronounced changes. Our findings have implications for the use of Cannabis sativa in phytoremediation and for the development of strategies to improve its tolerance to abiotic stress.

* *Practical Implications**

Our results suggest that Cannabis sativa can be used as a phytoremediation tool for the removal of Cd and Zn from contaminated soils. The plant's ability to synthesize cutin and wax in response to metal exposure can be used to improve its tolerance to abiotic stress.

* *Limitations**

Our study was limited to a single cultivar of Cannabis sativa and a single set of environmental conditions. Further studies are needed to confirm our findings and to explore the effects of Cd and Zn on other cultivars and under different environmental conditions.

* *Technical FAQ**

1. What is the optimal concentration of Cd and Zn for the removal of Cd and Zn from contaminated soils?

2. How does the level of jasmonate affect cutin and wax biosynthesis in Cannabis sativa?

3. Can Cannabis sativa be used as a phytoremediation tool for the removal of other heavy metals?

* *Conclusion**

In conclusion, our study demonstrated that Cd and Zn exposure alters leaf cuticle composition, leading to enhanced water transport properties and improved abiotic stress tolerance in dichlorfenilacetic acid-tolerant cultivars of Cannabis sativa. Our findings have implications for the use of Cannabis sativa in phytoremediation and for the development of strategies to improve its tolerance to abiotic stress.