Kicking back; recalcitrating; hence, showing repugnance or opposition; refractory.

Resistant to microbial attack.

Etymologically, to be recalcitrant means to "kick back." Recalcitrance, then, is more than stubborn disobedience; it's a revolutionary (or at least rebellious) act of revenge. See: KICK BACK.

Of seeds: unable to survive drying and subsequent storage at low temperature. See  field gene bank.

Term generally applied to organic matter that is quite stable or nutrients that are stable and not subject to release into soluble form.

Not responsive to treatment.