Characteristics of Progeny Obtained from the Cross between Geraniums (<b><i>Pelargonium×hortorum</i></b>) and Wild Species in Section <i><b>Ciconium</i></b>, Including Heat Tolerance and Odor of Leaves
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In order to develop new geranium cultivars with characteristics not found in existing cultivars, such as heat tolerance and odorless leaves, intercrosses between geranium and four wild species of section <i>Ciconium</i> were carried out. The intercrosses between geranium and <i>P. frutetorum, P. inquinans</i>, and <i>P. salmoneum</i> showed relatively high compatibility, regardless of the seed parent. Their F<sub>1</sub> plants grew vigorously and developed normally. On the contrary, some F<sub>1</sub> plants derived from the intercross with <i>P. acetosum</i> developed chlorosis and variegation in the leaves, with many plants dying in the early stage of growth. However, the F<sub>1</sub> plants that survived showed high pollen fertility, and F<sub>2</sub> and BC<sub>1</sub> generations could be obtained easily. Some F<sub>2</sub> plants showed odorless, and all BC<sub>1</sub> plants had non-trichome leaves. Heat tolerance trial was carried out in a greenhouse from spring to autumn using all plants of F<sub>1</sub>, F<sub>2</sub> and BC<sub>1</sub> obtained from backcrossing to geranium. Favorable plants with an increased number of flowering peduncles even in summer were selected from the BC<sub>1</sub> plants derived from <i>P. frutetorum, P. acetosum</i>, and <i>P. salmoneum</i>. These progeny can be used as breeding material for producing promising new heat-tolerant geraniums with odorless leaves.
- Environment Control in Biology
Environment Control in Biology 52(1), 37-43, 2014
Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists