By Urvashi Goenka Aug 23 (Reuters) - Indonesian shares rose on Wednesday, heading for a second straight session of gains, after the central bank unexpectedly cut its benchmark policy rate on Tuesday to boost sluggish lending and growth. Bank Indonesia (BI) became the second major Asian economy after India to cut its policy rate this year, bringing the 7-day reverse repurchase rate down by 25 basis points to 4.50 percent. Nineteen out of 20 respondents polled by Reuters had expected BI to stand pat on rates. Indonesia's main stock index rose as much as 0.5 percent, led by financial and consumer staples stocks with Bank Central Asia Tbk PT and PT Bank Mandiri rising about 1 percent each. "Real estate and discretionary should benefit sentiment-wise, though arguably some of this has already been reflected in equity prices," Morgan Stanley said in a note. "Banks is less clear - lower rates should be good for loan growth and credit quality but that has so far failed to materialise over the past six rate cuts." Meanwhile, other Southeast Asian stock markets traded sideways, tracking a similar movement in broader Asia shares , after having started stronger following a positive lead from Wall Street as positive tax reform comments from U.S. House Speaker Paul Ryan spurred gains in U.S. shares. Singapore shares were flat with United Overseas Bank rising as much as 1.2 percent and DBS Group Holdings gaining 0.7 percent. The city-state's annual cost price index data is due on Wednesday. A Reuters poll showed that the all-items consumer price index in July was expected to have risen 0.8 percent from a year earlier. Vietnamese shares fell as much as 0.2 percent with consumer staples leading the decline. For Asian Companies click; SOUTHEAST ASIAN STOCK MARKETS: Change as of 0355 GMT Change on day Market Current previous Pct Move close Singapore 3263.75 3263.79 0.00 Bangkok 1572.7 1573.19 -0.03 Manila 8008.99 8015.93 -0.09 Jakarta 5889.168 5880.297 0.15 Kuala Lumpur 1772.7 1774.22 -0.09 Ho Chi Minh 760.24 761.26 -0.13 Change on year Market Current End 2016 Pct Move Singapore 3263.75 2880.76 13.29 Bangkok 1572.7 1542.94 1.93 Manila 8008.99 6840.64 17.1 Jakarta 5889.168 5296.711 11.19 Kuala Lumpur 1772.7 1641.73 7.98 Ho Chi Minh 760.24 664.87 14.3 (Reporting by Urvashi Goenka; Editing by Subhranshu Sahu)