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Inbreds IL451b  sugary1 (su1)  and IL678a  su1  isogenic for the  sugary enhancer1 (se1)  gene mutation were used to analyze the relationship between  se1  gene dosage and endosperm sugar content. Each line was self-pollinated and reciprocal crosses were made between the isolines of each genotype to produce  se1  gene dosages of 0, 1, 2, and 3 in the triploid endosperm. Ears were harvested at 15, 18, 21, 24, 27, and 45 days after pollination (DAP). Whole kernels were freeze-dried, ground into powder, and stored at –80°C until subsequent chemical analyses. Sucrose, glucose and fructose were analyzed using high-pressure liquid chromatography (HPLC), the results of which indicated a significant increase in kernel sugar content when the  se1  allele is homozygous.   \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\begin{array}{lcl}&amp;\underline{\mathrm{Sucrose\ content\ at}{\ }21{\ }\mathrm{DAP}(\%{\ }\mathrm{dry}{\ }\mathrm{wt})}&amp;\\\underline{se1{\ }\mathrm{dose}}&amp;\underline{\mathrm{IL}{\ }451\mathrm{b}}&amp;\underline{\mathrm{IL}{\ }678\mathrm{a}}\\0&amp;9.6&amp;10.3\\1&amp;8.0&amp;10.7\\2&amp;11.3&amp;10.9\\3&amp;15.8&amp;12.2\end{array}\] \end{document}Sucrose content at 21 DAP (typical maturity for harvesting) was observed to increase in the IL451b and IL678a backgrounds from zero to three doses of  se1  by 65% and 18% respectively, indicating that this mutation varies in its expression in different genetic backgrounds. Associations between kernel phytoglycogen and starch content and  se1  gene dosage are presented. The biochemical lesion associated with the  se1  gene product is discussed.

Sugary enhancer1 (se1) Gene Endosperm Dosage and Sweet Corn Carbohydrate Content