Precocious genotypes and homozygous tendency generated by self-pollination in walnut.
Precocious genotypes and homozygous tendency generated by self-pollination in walnut.
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核桃自花授粉产生的早熟基因型及纯合倾向
DOI：
10.1186/s12870-018-1549-1
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发表时间：
2018-12-04
影响因子：
5.3
通讯作者：
Pei D
中科院分区：
文献类型：
--
作者：
Chen L;Dong R;Ma Q;Zhang Y;Xu S;Ning D;Chen Q;Pei D
BackgroundObservations of precocious (early bearing) genotypes of walnut (Juglans regiaL.) under natural conditions encouraged us to study the origin and genetic control of these fascinating traits.ResultsIn this study, the self-fertility, progeny performance, and simple sequence repeat (SSR) locus variation of iron walnut (Juglans sigillataDode), an ecotype ofJ. regia, were investigated. The average self-pollinated fruit set rate ofJ. sigillatacv. ‘Dapao’ (DP) was 7.0% annually from 1979 to 1982. The average germination rate of self-pollinated seeds was 45.2% during the 4-year period. Most progeny had inbreeding depression. Nine representative self-pollinated progeny (SP1–SP9), with special or typical traits of DP, were selected. SP1–SP4were precocious because they initiated flowers as early as 2 years after germination, compared to the 7–10-yr period that is typical of DP. SP9had not flowered since 1980. Twelve SSR markers were used to analyze the SP and DP. The genome of SP had a tendency toward high levels of homozygosity. The high levels of homozygosity reported in 18 additional precocious walnut genotypes complemented the results of this study.ConclusionsThese results provide evidence of precocious phenotypes and genomes with high levels of homozygosity that might be generated from self-pollinating walnut. This suggests that self-pollination might facilitate the generation of unique homozygous parents for subsequent use in walnut-breeding programs. The results also indicate that more attention should be focused on adequate management of precocious walnut to avoid early depression in the production of nuts.
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影响因子：
5.3
作者：
Meng Y;Li J;Liu J;Hu H;Li W;Liu W;Chen S
通讯作者：
Chen S
影响因子：
4.3
作者：
Martinez-Garcia, Pedro J.;Dicenta, Federico;Ortega, Encarnacion
通讯作者：
Ortega, Encarnacion
影响因子：
1.9
作者：
Gonzalez, Ana M.;De Ron, Antonio M.;Santalla, Marta
通讯作者：
Santalla, Marta
影响因子：
4.3
作者：
Chen, LingNa;Ma, QingGuo;Pei, Dong
通讯作者：
Pei, Dong
影响因子：
3.4
作者：
Delmas CE;Cheptou PO;Escaravage N;Pornon A
通讯作者：
Pornon A