Discontinuous low temperature stress and plant growth regulators during the germination period promote roots growth in alfalfa (Medicago sativa L.)----中国科学院遗传发育所农业资源研究中心

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论文

论文题目	Discontinuous low temperature stress and plant growth regulators during the germination period promote roots growth in alfalfa (Medicago sativa L.)
作　　者	蒋高乾、王士超、谢锦、谭攀、韩立朴;
发表年度	2023
刊物名称	PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷、期、页码	197; ;
影响因子
论文摘要	In high-cold regions, alfalfa is susceptible to cold damage during the seed germination. The effects of discon-tinuous low temperature stress and plant growth regulators (PGRs) on alfalfa were studied in response to the high day/night temperature differentials in the area. The experiments included seed germination, seedling cold tolerance and plant recovery. Variable temperatures (VT) of 0 degrees C/15 degrees C, 5 degrees C/20 degrees C and 10 degrees C/25 degrees C were set and seeds were soaked with alginate oligosaccharides (AOS), brassinolide (BR) and diethyl aminoethyl hexanoate (DA-6) during the germination period. Parameters such as seed germination and mean germination time (MGT), phenylalanine ammonia-lyase (PAL) activity and oligomeric proanthocyanidins (OPC) content of early seedlings, dry matter accumulation and root crown of the restored plants were analysed. The results showed that low variable-temperature (LVT) stress prolonged the MGT but had little inhibitory effect on germination percentage. Early seedlings adapted to LVT stress by regulating their own water and OPC content, PAL activity and other parameters. LVT induced early alfalfa seedlings to increase their underground biomass by shortening root length and increasing root diameter, and those that had accumulated more underground biomass had faster growth rates and higher total biomass when the ambient temperature rose. AOS also promoted an increase in root crown diameter and root dry weight. This research proved that LVT stress and AOS during the germination process can lead to better growth of alfalfa in high cold regions.
全文链接	http://dx.doi.org/10.1016/j.plaphy.2023.03.001
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