ジツ, シツ, み, みの.る, まこと, まことに, みの, みち.る, ぐみ, さね
JLPT3 G3 S8 F68
The relevant bronzeware inscription form shows that the element at the bottom# was originally not 貫 but a combination of 貝 commodities and 周 (an enclosure). The addition of 宀 roof/building yields the meaning "house full of treasures" → *be filled (with)* → *seed*; *berry*; *fruit*; *nut*; *content*; *substance*; *ingredients* (← fill) → *bear fruit*. Also, *actuality* and *sincerity* (← fully true content; compare 眞).
[Full Kanji Etymology List]