Bharti Airtelsaidon Thursday its promoters would take part in the $4.57 billion capital-infusion plan by subscribing to its rights issue.Promoter Singapore Telecommunications Ltd (Singtel) will subscribe to 17 crore shares in the Airtel's rights issue for a total consideration of Rs 3,750crore($535.89 million), the Singapore-based company said in a separate statement.Singtel and Airtel's major shareholders - Bharti Group and Bharti Telecom - intend to subscribe to their full entitlement, except for a renunciation by Bharti Telecom in favour of GIC Singapore, Singtel said.