| Amygdalus pedunculata Pall.Is a unique woody oil tree species in China.It is naturally distributed in central Inner Mongolia and And Maowusu Sandy Land in the West.It has strong cold resistance and drought resistance.It is the preferred tree species for ecological construction in arid and semi-arid areas of China.In this study,seeds from different provenances of Amygdalus pedunculata Pall at the developmental stage were taken as research objects to study the law of seed oil accumulation,Analyze the relationship between seed oil accumulation and seed sugar metabolism,protein metabolism,Explore the conversion rule of fatty acid conponents during the accumulation of seed oil.The research results are as follows:The morphological development of Amygdalus pedunculata Pall can be divided into three periods,which are the rapid growth period(15d after flowering to 64d after flowering),the slow growth period(64d after flowering to 85d after flowering)and the color change period(85d after flowering to 106d after flowering).During the rapid growth period,the volume of the fruit expands rapidly,and the oil accumulates slowly.During the slow growthperiod,the fruit grows slowly,but the oil accumulates rapidly.During the color change period,the peel color changes from dark green to dark purple,and the fruit gradually matures.In the early stages of fruit development,the accumulation of seed oil is slow,and in the slow growth period of the fruit,the oil content of seeds increases significantly.The oil content of seeds reached the highest value when the near fruits were ripe.The correlation analysis results of seed oil content and fruit morphological development show that the accumulation of seed oil has a very significant positive correlation with kernel dry weight.In the process of seed development,soluble sugar accumulates before the rapid accumulation ofoil,and then gradually decreases with the accumulation of oil.At the end of the accumulation of oil and fat,there is no decrease and the content remains stable;there is a similar pattern between the accumulation law of protein and starch and the accumulation law of oil,and the protein and starch content is positively correlated with the oil content.Seven fatty acids have been detected in the process of accumulation of Amygdalus pedunculata Pall seed oil,which are oleic acid,linoleic acid,linolenic acid,palmitic acid,stearic acid,palmitoleic acid and capric acid.The content of saturated fatty acids such as palmitic acid,stearic acid and capric acid gradually decreased with the development of seeds,while the content of unsaturated fatty acids such as oleic acid,linoleic acid,linolenic acid and palmitoleic acid gradually increased until the seeds matured The fatty acid content is as high as 94.91%.Among the unsaturated fatty acids,the content of oleic acid is the highest at 75.67%,and the content of linoleic acid is the second at 18.64%.As the seeds developed,the oleic acid content gradually increased,and the linoleic acid content increased first and then decreased;while the palmitic acid,stearic acid,and capric acid content continued to decrease,and the average content was 3.60%,1.27%,and 0.00%when the seeds matured.;Linolenic acid and palmitoleic acid are formed late,the content increases slowly,the content change is not obvious,the average content of seeds when they are mature is 0.33%and 0.50%,respectively.Correlation analysis showed that oleic acid,linolenic acid and palmitoleic acid showed a significant positive correlation during the accumulation of oil in the Amygdalus pedunculata Pall seed;the palmitic acid,stearic acid and capric acid showed a significant positive correlation;oleic acid Linolenic acid was significantly negatively correlated with linoleic acid,palmitic acid,stearic acid and capric acid;linoleic acid had no correlation with palmitic acid,stearic acid and capric acid. |
PDF Full Text Request