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Observations of precocious (early bearing) genotypes of walnut (Juglans regia L.) under natural conditions encouraged us to study the origin and genetic control of these fascinating traits. | Nội dung Text Precocious genotypes and homozygous tendency generated by self-pollination in walnut .den color inherit .ttnd ol .ttnd ul .ttnd dl padding 0 0px 0 20px .ttnd hr margin 10px 0px .ttnd a href javascript void 0 .ttnd a href color inherit dtextscript p text-align left dtextscript img vertical-align middle Chen et al. BMC Plant Biology 2018 18 323 lt br gt https doi.org 10.1186 s12870-018-1549-1 lt br gt lt br gt lt br gt lt br gt lt br gt RESEARCH ARTICLE Open Access lt br gt lt br gt Precocious genotypes and homozygous lt br gt tendency generated by self-pollination in lt br gt walnut lt br gt Lingna Chen1 2 Runquan Dong3 Qingguo Ma1 Yu Zhang3 Shizhong Xu4 Delu Ning3 Qin Chen3 and lt br gt Dong Pei1 lt br gt lt br gt lt br gt Abstract lt br gt Background Observations of precocious early bearing genotypes of walnut Juglans regia L. under natural lt br gt conditions encouraged us to study the origin and genetic control of these fascinating traits. lt br gt Results In this study the self-fertility progeny performance and simple sequence repeat SSR locus variation of iron lt br gt walnut Juglans sigillata Dode an ecotype of J. regia were investigated. The average self-pollinated fruit set rate of J. lt br gt sigillata cv. Dapao DP was 7.0 annually from 1979 to 1982. The average germination rate of self-pollinated seeds lt br gt was 45.2 during the 4-year period. Most progeny had inbreeding depression. Nine representative self-pollinated lt br gt progeny SP1 SP9 with special or typical traits of DP were selected. SP1 SP4 were precocious because they initiated lt br gt flowers as early as 2 years after germination compared to the 7 10-yr period that is typical of DP. SP9 had not flowered lt br gt since 1980. Twelve SSR markers were used to analyze the SP and DP. The genome of SP had a tendency toward high lt br gt levels of homozygosity. The high levels of homozygosity reported in 18 additional precocious walnut genotypes lt br gt complemented the results of
