桃树体不同部位果实着色差异及其与环境因子的关系研究
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引用本文:丁云龙,张斌斌,严 娟,马瑞娟,姜卫兵.桃树体不同部位果实着色差异及其与环境因子的关系研究[J].西北植物学报,2019,39(4):660~668
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丁云龙1,张斌斌2,严 娟2,马瑞娟2,姜卫兵1* (1 南京农业大学 园艺学院南京 2100952 江苏省农业科学院 果树研究所江苏省高效园艺作物遗传改良重点实验室南京 210014) 
基金项目:现代农业产业技术体系建设专项资金(CARS 30);
中文摘要:为探讨树体冠层不同部位桃果实着色机制差异及其与环境因子的关系,以晚熟桃品种‘霞晖8号’为试材,研究了果实3个典型发育时期(硬核期、膨大期、成熟期)树体冠层上部、中部外围、中部内膛和下部的温度、光照环境因子变化动态,并就其对果皮色泽、色素含量的影响及与果实着色相关的基因表达特点进行解析。结果表明:(1)与冠层下部果实相比,‘霞晖8号’冠层上部、中部外围和中部内膛成熟果实果皮a*/b*(红色饱和度/黄色饱和度)显著较高。(2)冠层下部成熟果实的果皮花色素苷含量最低而叶绿素含量最高,且与其他部位间差异显著。(3)果实不同发育时期花色素苷合成相关基因的表达量差异表明,果皮花色素苷合成是多基因协同调控的过程。(4)果实转色前,低光照强度抑制了花色素苷合成相关基因的表达,其中对UFGTDFRCHS基因的调控作用最明显;果实成熟期,与高光照条件相比,低光照条件下果皮花色素苷合成相关基因上调表达。研究认为,树体冠层不同部位光照条件差异可能是导致果实着色差异的主要环境因素之一,它通过调节与果皮花色素苷积累相关的基因表达水平控制果皮的着色。
中文关键词:  冠层部位  果实  色素  基因表达
 
Study on Difference of Peach Fruit Coloring and Relationship with Environmental Factors in Different Tree Canopy Position
Abstract:To explore the mechanism of variation in fruit coloring of peach (Amygdalus persica) in different tree canopy positions and its relationship with environmental factors, we studied the dynamic changes in temperature and light intensity in different canopy positions, i.e., upper, outer middle, inner middle and lower canopy during three fruit development stages like stone hardening stage, expanding stage and maturing stage of late ripening cultivar ‘Xiahui 8’ peach. The effects of environment on peel color, pigment content and the gene expression level related to fruit coloration were also studied. The results showed that: (1) the ripe fruits in upper and middle canopy (upper, outer middle and inner middle) of ‘Xiahui 8’ peach had significantly higher a*/b* (a*, b* are red and yellow saturation scale, respectively.) compared to the lower canopy fruit. (2) The ripe fruit in lower canopy had significantly lower Ant(anthocyanin) content and higher Chl(chlorophyll) in peel compared to the other fruits. (3) The expression levels of Ant biosynthetic related genes (UFGT, DFR, LDOX, CHS, F3H) revealed that all these five genes in peel were involved in Ant biosynthesis. (4) Before peel color changing, low light intensity could down regulate the expression level of the Ant biosynthetic related genes especially UFGT, DFR and CHS; While compared to the strong light environment, the expression levels of the related genes as mentioned above increased relatively under the weak light environment during fruit maturing stage. The results also suggested that the difference of light in different tree canopy positions might be one of the main environmental factors leading to fruit color difference.
keywords:peach  canopy position  fruit  pigment  gene expression
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