Abstract
Chinese chestnut (Castanea mollissima Blume) has noteworthy ecological, economic and cultural importance in the Northern Hemisphere. The low yield of chestnut often affect the economic efficiency. Ovary development is an important step in nut production. Changes in nutrient contents during ovary development in chestnut cultivar 'Yanshanzaofeng' have not been thoroughly investigated. In this study, cultivar 'Yanshanzaofeng' and 'Dabanhong' were used as material. About 50~100 pollinated female inflorescences were picked every five days (5, 10, 15, 20, 25, 30, 35, 40, 45, 50 days) to determine N, P, K, fat, total soluble sugar, crude protein and starch contents. The results indicated that the contents of total soluble sugar, starch and fat increased constantly in ovaries after self-and cross-pollination, but protein, N and K contents first increased in 20 DAP (day after pollination) and after that decreased in the stage of young fruit development. The changes of P has two peak values, one was in 40 DAP and the other was in 50 DAP. P and crude protein were not significantly after pollination treatments. However, N, sugar, starch, fat and K were significantly higher in cross-pollination treatment it seems that these nutrient has a decisive role during ovary development in chestnut. The characteristics of these nutrition changes provide a basis information for spraying N, P, K etc during ovary development and may have the potential to improve nut yield.
Highlights
Chestnut is widely distributed in the northern hemisphere, including East Asia, North America and the Mediterranean countries, especially China (Engin, 2007; Serdar et al, 2011)
The change of P content in ovary were two peak values after self-and cross-pollination, one was in 40 days and the other was in 50 days
There were no significant differences in the amount of P content in ovary of self-and crosspollination
Summary
Chestnut is widely distributed in the northern hemisphere, including East Asia, North America and the Mediterranean countries, especially China (Engin, 2007; Serdar et al, 2011). Castanea mollissima Blume is distributed in 24 provinces in China (Giancarlo and Daniela, 2005), from south to north, they are Taiwan, Hainan Island, Yunnan, Jiangsu, Hubei, Sichuan, Anhui, Jilin, Hebei, Shandong, Beijing, Tianjin and so on (Zou et al, 2013a) It is one of important economic forest trees in China (Yuhe et al, 2005). In this study is to determine the changes in nutrients in ovary of Chinese chestnut after self-and cross-pollination and provide basic information in relation to the seed production which may make an effective chemical measures to increase the yield in Hebei Province.
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