The nucleic acids of the present invention can be obtained form various organisms, including plants and in particular monocots or dicots. [0061] A polynucleotide of the present invention is inclusive of: [0062] (a) a polynucleotide encoding a polypeptide of SEQ ID NO: 2 including exemplary polynucleotides of SEQ ID NO:1; the polynucleotide sequence of the invention also includes the maize Rad3 pol