You can import it but it won't work properly. MBHD uses the derivation path of m/0'/0 to generate addresses (m/0'/1 for change addresses). Electrum uses the BIP44 standard derivation paths of m/44'/0'/0'/0 and m/44'/0'/0'/1

The upshot being that while it will accept the seed you put in, it will generate different addresses due to the different derivation paths.

NOTE: At this point in time, the only wallets that I have found that use the same derivation path as MBHD are "Breadwallet" (iOS and Android) and "Simple Bitcoin Wallet" (Android only).