**2.5 Heat tolerance of pollen and gametophytic selection for resistance to temperature stress in maize**

Selection for sporophyte tolerance to high temperature and drought is a part of many maizes breeding programs. But there is little information on the heat sensitivity of reproductive processes and structures, specifically pollen. At the same time, it is known that maize pollen is characterized by a low ability to resist adverse environmental conditions. High temperature combined with low relative air humidity does have the most destructive effect.
