Creating a hybrid apple plant suitable for hot climates through grafting involves some careful selection and techniques. Here’s a general guide on how you might achieve this:

1. Selecting Parent Plants: Choose parent apple trees that exhibit desirable traits for hot climates. Look for varieties known for heat tolerance, such as Anna, Golden Dorsett, or Ein Shemer. These varieties are often more resilient to higher temperatures.

2. Rootstock Selection: Select a rootstock that is compatible with your chosen apple variety and also has some tolerance to heat and drought. Some rootstocks, like MM.111 or M.9, are known for their adaptability to various environmental conditions.

3. Grafting Technique: Use the appropriate grafting technique, such as cleft grafting or whip-and-tongue grafting, to join the scion (desired apple variety) onto the rootstock. Make sure the graft union is tight and secure to promote successful integration.

4. Growth Conditions: Provide optimal growing conditions for the grafted plant. This includes adequate watering, especially during hot periods, and mulching to retain soil moisture. Consider shading the plant during extreme heat to prevent stress.

5. Monitoring and Care: Regularly monitor the grafted plant for any signs of stress, disease, or graft failure. Prune as necessary to promote healthy growth and development. Additionally, fertilize as needed to ensure proper nutrient levels.

6. Patience and Persistence: Growing a successful hybrid apple plant through grafting can take time and patience. Be prepared to wait for the graft to establish and the plant to mature before expecting fruit production.

7. Experimentation and Adaptation: Keep in mind that not all grafting attempts may be successful, especially when working with new combinations or under challenging environmental conditions. Be willing to experiment and adapt your techniques based on the outcomes.

By carefully selecting parent plants, utilizing appropriate grafting techniques, and providing optimal growing conditions, you can increase the likelihood of successfully creating a hybrid apple plant suited for hot climates. Remember that each growing environment is unique, so some experimentation and adaptation may be necessary to achieve the best results.