Abstract
ABSTRACT: Paeonia ostii ‘Feng dan’ is recommended as a new promising oil crop because of the nutrient elements in its seed; however, the development of this new oil crop is now limited due to its low seed setting rate. This study identified ways to improve the cross pollination of Feng dan as the maternal parent, which has been proved to be a suitable oil crop, so as to improve the seed setting rate of ‘Feng dan’, and to predict the functional relationship between pollen vigor and seed setting rate. improving the efficiency of cross pollination. Three major steps were conducted, first, to screen the appropriate method of measuring pollen vigor of the paternal parent, which could have a strong relationship with seed setting rate. Second, to obtain the corresponding seed setting rate by cross pollination. Third, the functional relationship between two indexes was founded which could be used in cross pollination practice. Results indicated that the best paternal parents of ‘Feng dan’ were ‘Feng dan’ cultivars from other different cultivation populations; The most suitable medium concentration for pollen germination was 100~150 g/L sucrose, 0.06~0.08 g/L boric acid, and 50~200 g/L PEG-6000. Both the seed setting rate and the number of seed grains were positively correlated with the pollen activity, and the seed setting rate was negatively correlated with the local precipitation.
Highlights
Paeonia ostii has been an outstanding ornamental plant with medicinal and oil value
Effect of sucrose concentrations on pollen germination rate At 0-150 g/L sucrose concentration, the pollen germination rate of most peony cultivars gradually increases with sucrose concentration increase (Figure 1-A) and reach a maximum value at 150 g/L mass concentration
When the sucrose concentration was more than 150 g/L, the pollen germination rate showed a downward trend as sucrose concentration rises
Summary
Paeonia ostii has been an outstanding ornamental plant with medicinal and oil value. Paeonia ostii ‘Feng dan’ is a main cultivar of oil peony because of its seed yield and oil content (GUO AN et al, 2014). ‘Feng dan’ belongs to an outcrossing cultivar with very low yield in a single cultivation, and its fruit only produces few seeds (YA YUN et al, 2017; HU LIANG et al, 2017). This study selected suitable cultivars as paternal plants to improve the seed setting rate of ‘Feng dan’ by cross pollination. The pollen vigor of each cultivar must be measured accurately as an important index for artificial pollination and hybrid breeding in peony production
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