title: Anatomical study of freezing injury in hardy and nonhardy alfalfa varieties treated with cytosine and guanine.
mesh_terms: D000064:Acclimatization; D003596:Cytosine / Q000494:pharmacology*; D005615:Freezing; D006147:Guanine / Q000494:pharmacology*; D007053:Ice; D000455:Medicago sativa / Q000166:cytology / Q000187:drug effects*
chemical_list: D007053:Ice; D006147:Guanine; D003596:Cytosine