1998•Journal of the Japanese Society for Horticultural ScienceOpen access
Two Different Types of Homeobox Genes Exist in Apples.
Tomoaki Sakamoto, Shinnosuke Kusaba, Yuriko Murakami, Masashi Fukumoto, Shuichi Iwahori
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Abstract
Two different types of partial sequence of homeobox genes, named APHB1 and APHB2, were isolated from apple. From the alignment of amino acid sequences of KNOTTED1-like homeobox genes and apple PCR fragments, APHB1 was considered to be a member of class I type genes because of their similarities. APHB1 expressed itself only in shoot apical tissues, stems, and flowers, but not in mature leaves and developing fruits which is, again, very similar to class I type genes. Likewise, APHB2 is considered to be a member of class II type genes because of their homologies. APHB2 is expressed in all organs involving mature leaves and developing fruits, which is characteristic of class II type homeobox genes. These findings reveal that at least two different types of homeobox genes exist in apple. They probably bind to different genes and play different roles in controlling the developmental switches in apple.
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