Preliminary study on the low self-fertility rate of 'Kuijin' apricots
To examine the self-sterility of apricots, pollen germination of Kuijin apricot was conducted in vitro. Pollen viability was determined by germination on solid media. A comparison of the effects of different medium components on pollen germination and pollen tube growth revealed that the most suitable media for pollen germination and pollen tube growth were 10% sugar + 0.1% boric acid and 5% sugar + 0.01% boric acid, respectively. Comparison of four cultivars showed that, for pollen tube growth, the optimum sucrose concentration was 10% for Katy, Jinkaite and Golden Sun and only 5% for Kuijin. The pollen germination rates of the four cultivars ranged from high to low in turn for Katy, Jinkaite, Golden Sun and Kuijin, For pollen tube growth length, the order of the four cultivars from high to low was Katy, Golden Sun, Jinkaite and Kuijin. The self-pollination rate of Kuijin apricot, 4.7%, indicated that it is self-incompatible. Potential reasons for this self-incompatibility of Kuijin, including pollen weight and amount of pollen, were investigated. Both weight and amount of pollen were far less for Katy than for Kuijin, but the self-pollination rate of Katy is greater than that of Kuijin. The results showed that the self-pollination rate of Kuijin is closely related to pollen tube length but had no direct correlation with pollen amount.
Han, X.P., Wang, J.Z., Xue, X.M., Nie, P.X., Chen, R. and Gao, C.M. (2018). Preliminary study on the low self-fertility rate of 'Kuijin' apricots. Acta Hortic. 1214, 31-38
pollen amount, pollen viability, pollen germination, pollen tube length, self-incompatibility