5SINGSIT C, VEILLEUX R E. Chloroplast density in guard cells of leaves of anther-derived potato plants grown in vitro and in vito [ J ]. Hort Science, 1991,26 ( 5 ) :592-594.
6CHANDLER C K, LYRENE P M. Relationship between guard cell length and ploidy in Vaccinium[ J]. Hort Science, 1982,17( 1 ) : 53-54.
