Diamond would say that the three most important aspects of flora in the Fertile Crescent are that they were easy to plant, store, and provided a lot more calories then the plants of New Guinea. The plants of New Guinea took a lot of time and energy to grow, they could not be stored because it would rot within a couple of days and it didn't provide the same amount if calories or protein as the cereal plants of the Fertile Crescent. Those three aspects encouraged domestication. If the plant was easy to plant, that meant they could grown more food to feed more people. If it could be stored for a long period of time, then people would had longer lasting food supply. If it provided more energy, then people could be able to do more. These three aspects led to the advancement of the Middle East a lot quicker then in New Guinea or any other part of the world.
If these aspects were to be true in Mesoamerica, domestication would only exist in one area of the American continent (not all of it). The reason for this would be because of the north-south longitude. The northern part of the Americas could not grow the same foods as those in the southern parts of the Americas because they had a radically different climate. Overall, the doestication of plants and farming would happened in the Americas at different times and with different plants.