UPDATE 1-Mubadala converts Aldar bonds to boost capital by 10 pct

* Bonds converted at 1.75 dirhams/share

* Mubadala to be largest shareholder in merged entity

* Sorouh says working hard to meet EGM quorum on Feb. 21

(Recasts, adds details)

DUBAI, Feb 19 (Reuters) - Abu Dhabi's Aldar Properties

, which plans to merge with smaller rival Sorouh Real

Estate, on Tuesday said its largest shareholder

Mubadala converted bonds in the company to shares, boosting its

capital by nearly 10 percent.

State-owned investment fund Mubadala converted the bonds at

a price of 1.75 dirhams per share, Aldar said in a bourse

statement, resulting in an increase in capital to 4.48 billion

dirhams ($1.22 billion) from 4.085 billion dirhams earlier.

Shares in Aldar, which has been bailed out by the Abu Dhabi

government over the past two years with around $10 billion in

funding, closed at 1.54 dirhams on the Abu Dhabi bourse Monday.

The stock has fallen 5.5 percent since a state-backed merger

with Sorouh was agreed on January 21.

Abu Dhabi's two biggest property firms agreed on an

all-share merger in January, aimed at reviving the emirate's

battered real estate sector, creating a business with $13

billion in assets.

Both companies will hold an extraordinary general meeting of

shareholders to vote on the proposed merger on Feb. 21. The

effective date of the merger has been set for June 30.

However, questions have been raised on the ability of Sorouh

to reach the necessary quorum for approving the merger on Jan.

21.

"We are working hard to encourage all of our 35,000 plus

shareholders to attend the EGM this Thursday either by proxy or

in person. However, it is not unusual for companies to obtain a

quorum only at the second EGM meeting," a Sorouh spokesman said

in an emailed statement late on Monday.

"We remain confident of a successful vote in favour of a

merger as we believe it is in the best interest of all

stakeholders."

The Abu Dhabi government will own a 37-percent stake in the

new firm and will also pay Sorouh 3.2 billion dirhams in

exchange for some infrastructure assets and units in its The

Gate development.

Mubadala will be the single largest shareholder in the

combined entity with a holding of 19.15 percent.

($1 = 3.6730 UAE dirhams)

(Reporting by Dinesh Nair and Praveen Menon; Editing by Matt

Driskill)