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 WANG Mingxiu,LUAN Wei,et al.Responses of starch biosynthesis-related genes to nutrition starvation in Landoltia punctata[J].Chinese Journal of Applied & Environmental Biology,2019,25(01):128-135.[doi:10.19675/j.cnki.1006-687x.2018.04021]





Responses of starch biosynthesis-related genes to nutrition starvation in Landoltia punctata
王明秀 栾威 马欣荣 陶向 赵云
1四川大学生命科学学院 成都 6100412中国科学院成都生物研究所 成都 610041
WANG Mingxiu1 2 LUAN Wei2 MA Xinrong2 TAO Xiang2** & ZHAO Yun1**
1 College of Life Sciences, Sichuan University, Chengdu 610041, China2 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
Landoltia punctata nutrient starvation starch biosynthesis gene transcriptome qRT-PCR
浮萍是一种形态高度退化的开花植物,环境适应性广,生长条件适宜时可以接近指数增长的速度在16-48 h内实现生物量的翻倍. 以寡营养处理,少根紫萍(Landoltia punctata)淀粉含量可在7 d内提高到45%以上(干重). 通过深入分析转录组数据,分别挖掘到ADP葡萄糖焦磷酸化酶编码基因(LpAGP)5个、颗粒结合型淀粉合酶基因(LpGBSS)2个、可溶性淀粉合酶基因(LpSSS)2个、淀粉分支酶基因(LpSBE)5个、异淀粉酶基因7个(LpISA)、普鲁兰酶基因(LpPUL)1个. 转录组定量结果表明LpAGPS1、LpAGPL2、LpAGPL3、LpGBSSI、LpGBSSII、LpSBEI-1、LpISA3和LpPUL1的表达量均因寡营养处理而上调. 通过qRT-PCR检测LpAGPs等16个淀粉合成关键基因的表达量,发现绝大部分淀粉合成相关基因表达量上调,而参与淀粉降解途径相关基因(如α-淀粉酶和β-淀粉酶编码基因)的表达量因寡营养处理而下调. 这种不同的调节方式促使少根紫萍淀粉合成“开源节流”,淀粉得以快速积累. 本研究结果可为进一步研究少根紫萍淀粉合成关键基因功能及淀粉积累机制奠定基础. (图3 表2 参33)
Landoltia punctata can accumulate high starch content, up to > 45% (dry weight) in 7 days, upon nutrient starvation. This study aimed to identify the genes related to starch metabolism and their expression patterns in response to starvation in L. punctata. The starvation-stress response transcriptome of L. punctata was carefully analyzed and used for the identification and quantification of starch metabolism-related genes. A quantitative real time-polymerase chain reaction (qRT-PCR) was performed to verify the quantification results. The results showed the presence of five LpAGP, two LpGBSS, two LpSSS, five LpSBE, seven LpISA, and one LpPUL genes. The RNA-Seq quantification results showed that LpAGPS1, LpAGPL2, LpAGPL3, LpGBSSI, LpGBSSII, LpSBEI-1, LpISA3, and LpPUL1 were all up-regulated by nutrient starvation. The qRT-PCR results of 16 starch metabolism key genes verified that most of them were up-regulated by starvation, while the expression of α-amylase and β-amylase were down-regulated. The opposite expression change patterns of starch biosynthesis- and degradation-related key genes resulted in the accumulation of starch. This study paves the way for further studies on elucidating the function and mechanism starch metabolism-related genes in L. punctata.


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更新日期/Last Update: 2019-02-25