Morphological Characteristics and Anatomy of a Novel Floral Mutant of Petunia Morphological Characteristics and Anatomy of a Novel Floral Mutant of Petunia FLORALORGANOGENESISOFSAGITTARIA GUAYANENSISSSP.LAPPULA ——WITH ADDITIONALREFERENCETOITS RELATIONSHIPWITH THERELATIVEGENERA Isolation and Functional Analysis of a MADS Box Gene in Populus tomentosa Genetic Analysis and Gene Mapping of a Long Empty Glumes Mutant in Rice (Oryza sativa L.)