Bloomberg: Toyota Motor Corp., the world’s largest automaker, is buying a $50 million stake in electric-car producer Tesla Motors Inc. as the companies seek to offer low- polluting models. Tesla also will buy a closed Toyota joint-venture plant in California to build its Model S and other vehicles, Tesla Chief Executive Officer Elon Musk said yesterday. The companies plan to cooperate in developing electric cars, parts, production systems and engineering. The deal may help Toyota compete …