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MRI can reveal metabolic changes in lily bulbs in vivo during dormancy release

Science China(Life Sciences) 2012年第11期55卷 1002-1006页

作者： HAN HaoJun YI MingFang Department of Ornamental Horticulture and Landscape Architecture China Agricultural UniversityBeijing 100193China Fushun Teachers College Fushun 113006China

The factors influencing dormancy release in lily bulbs strongly affect commercialization success, but the mechanism of dormancy release is still unclear. Magnetic resonance imaging (MRI) can detect changes in morphology and water status in a living plant bulb and aid in investigating release factors. To evaluate whether MRI could be used to detect intra-bulb metabolic changes during the dormant period in oriental Lilies (lilium 'Sorbonne'), a series of MRI and sugar concentration measurements were performed weekly on bulbs stored for 11 weeks at 4°C. The image quality of intra-bulb structure obtained using T 1-weighted imaging was superior to that obtained using T 2 -weighted imaging and had a higher signal-to-noise ratio (0.97±0.01). Magnetization transfer ratio values for the bud and basal plate declined during the first eight weeks of cold storage (P>0.05), and were well correlated with concentration of soluble sugar in the bud (R 2 =0.95) and basal plate (R 2 =0.93). Thus, MRI can serve as a valuable tool for observation and analysis of dynamic morphological and metabolic changes in vivo during dormancy release. This information is potentially useful as a guide in the improvement of horticultural product quality.

关键词： transverse and longitudinal relaxation times magnetization transfer ratio (MTR) soluble sugar magnetic resonanceimaging (MRI) lilium oriental hybrids dormancy release

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The Dynamics of Changes in Starch and Lipid Droplets and Sub-Cellular Localization of β-Amylase During the Growth of Lily Bulbs

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Journal of Integrative Agriculture 2012年第4期11卷 585-592页

作者： WU Sha-sha WU Jin-di JIAO Xue-hui ZHANG Qi-xiang LV Ying-min College of Landscape Architecture Beijing Forestry University Beijing 100083 P.R.China China National Research Center for Floriculture Engineering ＆ Technology Beijing 100083 P.R.China

The ultra-structure of mother and outer daughter scales of lilium oriental hybrid Sorbonne were studied using transmission electron microscope to examine the sub-cellular localization of starch and lipid droplets during growth and development from shoot emergence to *** contents of starch granules and lipid droplets in the cell of the mother scales decreased significantly from shoot emergence to anthesis,indicating that these scales served as a source for growth and *** flowering,the number of starch granules and lipid droplets increased dramatically,and finally the cells were filled with the above molecules indicating that the bulb becomes a major sink during bulb *** observation also showed that symplastic pathway is the main pathway in cells in the exchange and transportation of material during bulb *** activity of β-amylase,one of the key enzymes catalyzing starch breakdown,showed a similar *** enzyme sub-cellular localization via immune-gold electron-microscopy showed that βamylase was predominantly located together with starch granules,while the gold particles were scarcely found in other sub-cellular *** result suggested that this enzyme is compartmented together with its functional substrate supporting its function in catalyzing starch breakdown in living plant cells.

关键词： lilium oriental hybrids bulb scale source and sink ultra-structure β-amylase sub-cellular localization

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