| 王贤达,陈添峰,黄镜浩,范国成,李健.琯溪蜜柚砂囊粒化的无损检测[J].中国南方果树,2017,46(6): |
| 琯溪蜜柚砂囊粒化的无损检测 |
| Nondestructive examination of juicy sac granulation in 'Guanxi pomelo' [Citrus grandis (L.) Osbeck] with magnetic resonance imaging |
| 投稿时间：2017-08-06 修订日期：2017-09-04 |
| DOI： |
| 中文关键词: 琯溪蜜柚 砂囊粒化 磁共振成像 无损检测 |
| 英文关键词:'Guanxi' pumelo Juicy sac granulation Magnetic resonance imaging Nondestructive examination |
| 基金项目: |
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| 摘要点击次数: 1915 |
| 全文下载次数: 2304 |
| 中文摘要: |
| 摘 要：柑橘砂囊粒化是柑果成熟期与采后贮藏期的常见生理性病害，严重影响果实品质。本文采用1.5 T 高场磁共振成像仪对采后贮藏30 d的琯溪蜜柚[Citrus grandis (L.) Osbeck]果实进行磁共振扫描检查，并以同层断面解剖图为对照，评估磁共振成像（MRI）应用于柑橘砂囊粒化症无损检测的有效性。结果表明， MRI检测中，T2WI能够显著区分果肉组织与海绵层组织的信号差异，其信号强度可代表果实组织相对含水量；T2WI信号在砂囊粒化部位强度显著降低，病变组织的失水特征清晰，与解剖结果一致。T2WI对砂囊粒化的确诊率100%，显著优于T1WI成像的识别率41.7%（χ2 = 5.76，P = 0.016）；T2WI和T1WI均能显示种籽照影，但T2WI对果肉组织影像的分辨率优于T1WI，因此MRI的T2WI分析可作为一种无损检测方法，对柚商品果实上市前砂囊粒化症发生程度以及种籽有无进行评估。 |
| 英文摘要: |
| Abstract: Juicy sac granulation is a physiological disorder that seriously impacts fruit quality and could often be observed during maturation and post-harvest storage of citrus fruits. To develop efficient techniques for nondestructive examination of juicy sac granulation, 'Guanxi' pumelo [Citrus grandis (L.) Osbeck] fruits, which have been storages for 30 d post harvest, were scanned with a 1.5 T nuclear magnetic resonance spectrometer, the results from magnetic resonance imaging (MRI) were then verified with the anatomical data of the fruits in this study. Results herein showed that T2 weighted images (T2WI) could successfully distinguish the pulpous tissue from the spongy tissue, based on signal intensity that is determined by relative water content of tissues. T2WI had lower signals in granulated regions, suggesting the typical characteristic of water loss of the tissues. For juicy sac granulation, T2WI had a diagnostic rate of 100%, which is significantly higher than that of T1 weighted images (T1WI, 41.7%), according to χ-square test (χ2 = 5.76，P = 0.016). Even though both T1WI and T2WI could display seeds clearly, T2WI had much higher resolutions in pulpous tissues, and therefore, could be used for nondestructive examination of juicy sac granulation and evaluation of seediness of pomelo fruits before marketing. |
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