Reference Report for AP20210615.3
| Title: | Two coordinately regulated homologs of Flowering Locus T are involved in the control of photoperiodic flowering in soybean |
| Authors: | Kong, F., Liu, B., Xia, Z., Sato, S., Kim, B.M., Watanabe, S., Yamada, T., Tabata, S., Kanazawa, A., Harada, K., Abe, J. |
| Source: | Kong et al. 2010 Plant Physiology, 154(3):1220-1231 |
| Abstract: | FLOWERING LOCUST(FT) is a key flowering integrator in Arabidopsis (Arabidopsis thaliana), with homologs that encode florigens in many plant species regardless of the type of photoperiodic response. We identified 10FThomologs, which were arranged as five pairs of linked genes in different homoeologous chromosomal regions, in soybean (Glycine max), a paleopolyploid species. Two of theFThomologs,GmFT2aandGmFT5a, were highly up-regulated under short-day (SD) conditions (inductive for flowering in soybean) and had diurnal expression patterns with the highest expression 4 h after dawn. Under long-day (LD) conditions, expression ofGmFT2aandGmFT5awas down-regulated and did not follow a diurnal pattern. Flowering took much longer to initiate under LD than under SD, and only theGmFT5atranscript accumulated late in development under LD. Ectopic expression analysis in Arabidopsis confirmed that bothGmFT2aandGmFT5ahad the same function as ArabidopsisFT, but the effect ofGmFT5awas more prominent. A double-mutant soybean line for twoPHYTOCHROME A(PHYA) genes expressed high levels ofGmFT2aandGmFT5aunder LD, and it flowered slightly earlier under LD than the wild type grown under SD. The expression levels ofGmFT2aandGmFT5awere regulated by the PHYA-mediated photoperiodic regulation system, and theGmFT5aexpression was also regulated by a photoperiod-independent system in LD. Taken together, our results suggest thatGmFT2aandGmFT5acoordinately control flowering and enable the adaptation of soybean to a wide range of photoperiodic environments. |
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