Identification and Application of BhAPRR2 Controlling Peel Colour in Wax Gourd (Benincasa hispida).

Identification and Application of BhAPRR2 Controlling Peel Colour in Wax Gourd (Benincasa hispida).
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DOI:
10.3389/fpls.2021.716772
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发表时间:
2021
影响因子:
5.6
通讯作者:
Wang P
Wang P
中科院分区:
生物学2区
文献类型:
--
作者:
Ma L;Liu Z;Cheng Z;Gou J;Chen J;Yu W;Wang P

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果皮颜色是影响蔬菜商品品质的重要因素,但在冬瓜中,控制这一性状的基因还不清楚。在此,我们利用两个F_2代遗传分离群体来探索冬瓜的遗传模式,并克隆与冬瓜绿皮和白皮相关的基因。F2和Bc1性状分离比分别为3:1和1:1,受核基因控制。对两个F2植株的批量分离分析显示,chr5的峰值超过了可信区间。此外,6,244个F2植株被用于将候选区间压缩到一个179 kb的区域,在该区间中存在一个候选基因Bch05G003950(BhAPRR2),该基因编码与果皮颜色调控有关的双组分反应调节蛋白拟南芥伪反应调节器2(APRR2)。绿皮冬瓜BhAPRR2编码序列中的两个碱基(GA)在白皮冬瓜中缺失。后者含有移码突变、过早终止密码子,并且缺少蛋白质功能区所需的335个残基。绿皮冬瓜的叶绿素含量和BhAPRR2的表达显著高于白皮冬瓜。因此,BhAPRR2可能对冬瓜果皮颜色有调节作用。本研究为进一步研究冬瓜果皮颜色的基因调控机制提供了理论基础。
Peel color is an important factor affecting commodity quality in vegetables; however, the genes controlling this trait remain unclear in wax gourd. Here, we used two F2 genetic segregation populations to explore the inheritance patterns and to clone the genes associated with green and white skin in wax gourd. The F2 and BC1 trait segregation ratios were 3:1 and 1:1, respectively, and the trait was controlled by nuclear genes. Bulked segregant analysis of both F2 plants revealed peaks on Chr5 exceeding the confidence interval. Additionally, 6,244 F2 plants were used to compress the candidate interval into a region of 179 Kb; one candidate gene, Bch05G003950 (BhAPRR2), encoding two-component response regulator-like protein Arabidopsis pseudo-response regulator2 (APRR2), which is involved in the regulation of peel color, was present in this interval. Two bases (GA) present in the coding sequence of BhAPRR2 in green-skinned wax gourd were absent from white-skinned wax gourd. The latter contained a frameshift mutation, a premature stop codon, and lacked 335 residues required for the protein functional region. The chlorophyll content and BhAPRR2 expression were significantly higher in green-skinned than in white-skinned wax gourd. Thus, BhAPRR2 may regulate the peel color of wax gourd. This study provides a theoretical foundation for further studies of the mechanism of gene regulation for the fruit peel color of wax gourd.
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