Control of floral transition in the bioenergy crop switchgrass

文献类型： 外文期刊

第一作者： Niu, Lifang

作者： Niu, Lifang;Lin, Hao;Wolabu, Tezera W.;Tadege, Million;Niu, Lifang;Lin, Hao;Fu, Chunxiang;Wang, Zeng-Yu;Wu, Yanqi;Fu, Chunxiang

作者机构：

关键词： biomass feedstock;floral transition;florigen;FT;Panicum virgatum L;PvAPL;PvFT1;PvSL

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

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收录情况： SCI

摘要： Switchgrass (Panicum virgatum L.), a perennial warm season bunchgrass native to North America, has been a target in the U.S. as a renewable bioenergy crop because of its ability to produce moderate to high biomass yield on marginal soils. Delaying flowering can increase vegetative biomass production by allowing prolonged growth before switching to the reproductive phase. Despite the identification of flowering time as a biomass trait in switchgrass, the molecular regulatory factors involved in controlling floral transition are poorly understood. Here we identified PvFT1, PvAPL1-3 and PvSL1, 2 as key flowering regulators required from floral transition initiation to development of floral organs. PvFT1 expression in leaves is developmentally regulated peaking at the time of floral transition, and diurnally regulated with peak at approximately 2 h into the dark period. Ectopic expression of PvFT1 in Arabidopsis, Brachypodium and switchgrass led to extremely early flowering, and activation of FT downstream target genes, confirming that it is a strong activator of flowering in switchgrass. Ectopic expression of PvAPL1-3 and PvSL1, 2 in Arabidopsis also activated early flowering with distinct floral organ phenotypes. Our results suggest that switchgrass has conserved flowering pathway regulators similar to Arabidopsis and rice.

分类号： Q948

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