As a critical food crop,sweetpotato(Ipomoea batatas(L.)Lam.)is widely planted all over the world,but it is deeply affected by Sweetpotato Virus Disease(SPVD).The present study utilized short tandem target mimic(STTM)t...As a critical food crop,sweetpotato(Ipomoea batatas(L.)Lam.)is widely planted all over the world,but it is deeply affected by Sweetpotato Virus Disease(SPVD).The present study utilized short tandem target mimic(STTM)technology to effectively up-regulate the expression of laccase(Ib LACs)by successfully inhibiting the expression of mi R397.The upstream genes in the lignin synthesis pathway were widely up-regulated by feedback regulation,including phenylalanine ammonialyase(PAL),4-coumarate-Co Aligase(4 CL),hydroxycinnamoyl Co A:shikimatetransferase(HTC),caffeicacid O-methyltransferase(COMT),and cinnamyl alcohol dehydrogenase(CAD).Meanwhile,the activities of PAL and LAC increased significantly,finally leading to increased lignin content.Lignin deposition in the cell wall increased the physical defence ability of transgenic sweetpotato plants,reduced the accumulation of SPVD transmitted by Bemisia tabaci(Gennadius),and promoted healthy sweetpotato growth.The results provide new insights for disease resistance breeding and green production of sweetpotato.展开更多
基金financially supported by the National Key R&D Program of China (2019YFD1001300 and 2019YFD1001305)the earmarked fund for CARS-10-Sweetpotatothe Jiangsu Postgraduate Scientific Research and Practical Innovation Program Project, China (KYCX19-2207)
文摘As a critical food crop,sweetpotato(Ipomoea batatas(L.)Lam.)is widely planted all over the world,but it is deeply affected by Sweetpotato Virus Disease(SPVD).The present study utilized short tandem target mimic(STTM)technology to effectively up-regulate the expression of laccase(Ib LACs)by successfully inhibiting the expression of mi R397.The upstream genes in the lignin synthesis pathway were widely up-regulated by feedback regulation,including phenylalanine ammonialyase(PAL),4-coumarate-Co Aligase(4 CL),hydroxycinnamoyl Co A:shikimatetransferase(HTC),caffeicacid O-methyltransferase(COMT),and cinnamyl alcohol dehydrogenase(CAD).Meanwhile,the activities of PAL and LAC increased significantly,finally leading to increased lignin content.Lignin deposition in the cell wall increased the physical defence ability of transgenic sweetpotato plants,reduced the accumulation of SPVD transmitted by Bemisia tabaci(Gennadius),and promoted healthy sweetpotato growth.The results provide new insights for disease resistance breeding and green production of sweetpotato.
