Hi Jagadeesh,
each issue does keep track of history of changes and you can also configure notifications for changed description. There might be a way to configure some fine-grained permissions but instead I would recommend asking your QA team to create new issues when anything changes.
In general, an agile approach to software relies less on locking systems down and more on team communication and trust. The Agile Manifesto is a great idea to discuss with your team: https://agilemanifesto.org
You could also run a Team Health Monitor from our playbook to help your team identify opportunities to improve the ways you are working together. https://www.atlassian.com/team-playbook/health-monitor
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