The study found the mechanism of regulating chrysanthemum response to hypothermia stress

Cut chrysanthemum is China’s main export of foreign exchange earning flowers, and market demand drives the annual supply and production of cut chrysanthemum. Low temperatures in late autumn, winter and early spring have become one of the main bottlenecks limiting the annual production supply of chrysanthemum. At present, cut chrysanthemum is mostly cultivated in facilities, and the low temperature of late autumn, winter and early spring causes high energy consumption in facility cultivation, and energy consumption accounts for about 10%~30% of production costs, resulting in high production costs and seriously affecting economic benefits. Therefore, it is urgent to cultivate new varieties of cut chrysanthemum that are resistant to low temperatures.

Recently, the team of Liu Qinglin, a professor at the College of Landscape Architecture of Sichuan Agricultural University, published a research paper in Plant Physiology, revealing the molecular mechanism of non-specific lipotransfer proteins DgnsLTP1 and DgPIP in co-regulating chrysanthemum response to low temperature stress.

When chrysanthemums are subjected to low temperature stress, both DgnsLTP1 and DgPIP can enhance the low temperature tolerance of chrysanthemums. Further studies found that DgnsLTP1 functions in a way that relies on DgPIP. Lysine malonylation of DgnsLTP1 at K81 site can enhance the stability of DgPIP, inhibit the degradation of DgPIP, and enhance the low temperature resistance of chrysanthemum. In this study, two low-temperature resistance genes (DgnsLTP1 and DgPIP) were obtained, and the molecular mechanism of low-temperature resistance was analyzed at the same time. At the same time, Liu Qinglin’s team used the efficient genetic transformation system of chrysanthemum to breed a batch of transgenic (DgnsLTP1 and DgPIP) new chrysanthemum materials that are resistant to low temperature and have no obvious phenotypic defects, a total of 8 copies.

The results of this study provide genetic resources for the breeding of chrysanthemum low-temperature resistant molecules, and also provide some reference for the analysis of the biological function of lysine malonylation in plants in response to low-temperature stress.

Molecular mechanism of “DgnsLTP1-DgPIP” module regulating low-temperature stress in chrysanthemums, Sichuan Agricultural University

Professor Liu Qinglin of Sichuan Agricultural University is the corresponding author of the paper, and graduate students Liao Xiaoqin, Zhang Xingsu and Li Xin are the co-first authors of the paper. This research was supported by the National Natural Science Foundation of China and the Natural Science Foundation of Sichuan Province. (Source: China Science News, Zhang Qingdan, Zhang Tingyu)

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