Pollenstorage
After desiccation, pollen grains were placed in 2ml cryovials and stored at 30 ◦C, 25 ◦C, 15 ◦C, 4 ◦C, and −86 ◦C. A small amount of pollen was removed at regular intervals to estimate the germi- nation rate. Pollen stored under −86◦C was thawed after storage by keeping the samples at room temperature for 5 min. After thaw- ing, pollen was obtained to detect the germination rate using the aforementioned method.