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Bulletin of Botanical Research ›› 2015, Vol. 35 ›› Issue (1): 133-140.doi: 10.7525/j.issn.1673-5102.2015.01.020

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Seed Development, Lipid Accumulation and Its Relationship with Carbohydrates and Protein in Xanthoceras sorbifolia Bunge


  1. Beijing Forestry University,College of Biological Science and Biotechnology,Beijing 100083
  • Online:2015-01-15 Published:2015-03-11
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Abstract: Xanthoceras sorbifolia Bunge, belonging to the family Sapindaceae, is one of the most valuable oil trees widely distributed in northern China. We studied the lipid accumulation and its relationship with carbohydrates and protein in developing X.sorbifolia seeds. Seed development can be divided into stage Ⅰ from flowering to 33 days after anthesis(d), stage Ⅱ(34-47 d), stage Ⅲ(48-68 d) and stage Ⅳ(69 d to maturity) based on morphological traits combined with weight measurements. Oil bodies were first observed in the green embryo at around 33 d. Rapid lipid accumulation commenced at around 40 d and continued to 68 d. The long period of rapid lipid accumulation contributes to a high lipid level in the mature embryo (60% of dry mass). Differences in the accumulation patterns of lipid, carbohydrates and protein indicate that the lipid synthesis is achieved largely by soluble sugar directly from the photosynthesis of source leaves rather than transiently accumulated starch, and the lipid and protein accumulation are independent processes in the developing embryo. We detected six fatty acids in the developing embryo. Among them, oleic and linoleic acid dominated the lipid composition, but they exhibited contrasting accumulation patterns.

Key words: Xanthoceras sorbifolia Bunge, seed development, lipid accumulation, fatty acids, starch, soluble sugar, protein

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