Answer:
Landed nobility in Japan was a warrior caste so they held all the military power in the country thus undermining the central political power which was the Emperor.
Step-by-step explanation:
In Japan, the landed nobility, was indeed a warrior caste and the most influential of those warrior leaders were called daimyos. Daimyos were mostly interested in expanding and controlling their own land. Because they possessed military power they were the real power in the state and the Emperor was mostly powerless.
The central political system gained power with the rise of the Shogunates, lead by Shoguns who were the greatest of the daimyo and who managed to control other daimyo. The emperor only managed to gain power after the Meiji Restoration.