(Corrects headline and first paragraph to show that new center will be developing conventional hybrid strains on corn; it will not be developing GMO corn seeds.)

MEXICO CITY, Sept 29 (Reuters) - Global seed technology giant Monsanto said on Monday it has launched a global center in Mexico for developing conventional hybrid strains of corn, part of the company's push to boost output of the planet's most widely produced grain.

The center, based in Tlajomulco de Zuniga on the southern fringe of the western city of Guadalajara, will be used to centralize development of Monsanto's corn seed research, mainly for the U.S. market, the company said.

"The aim is to create new varieties tolerant to diseases and the stresses that affect maize cultivation all over the world due to growing negative conditions caused by global climate change," the company said in a statement.

Scientists say modern corn comes from teosinte, a tiny wild grain native to southern Mexico.

U.S.-based Monsanto is among several multinational agricultural firms seeking permission for widespread planting of corn that harnesses genetically modified organisms (GMO) to boost desirable characteristics of the staple crop in Mexico, where the issue is highly controversial.

Proponents of GMO corn say studies show that output will rise and costly inputs such as pesticides and fertilizers will fall, and say that GMO crops have proven safe for human consumption.

Critics contend that large-scale plantings will contaminate native strains of the grain and harm biodiversity. They also point to toxins that protect GMO corn against pests that may be linked to elevated insect mortality, which could undermine pollination.

Last year, in a victory for opponents of GMO corn, a federal judge in Mexico City ordered a temporary halt to the government's ability to issue any new GMO corn permits.

The judge's order remains in effect.

(Reporting by Gabriel Stargardter; Editing by Leslie Adler)