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摘要: 选择具有长期休眠特性的3种冬青属Ilex树种铁冬青Ilex rotunda，冬青Ilex chinensis和全缘冬青Ilex integra种子，以无休眠的小果冬青Ilex micrococca种子为对照，开展低温层积过程中种子内含物质量分数、酶活性和内源激素质量分数等生理变化研究，以揭示冬青属种子休眠的可能生理机制。测定结果表明，铁冬青、冬青和全缘冬青种子在低温层积过程中代谢活跃，脂肪质量分数不断下降，淀粉和还原糖质量分数明显增加；过氧化物酶（POD）活性显著增强，而过氧化氢酶（CAT）活性明显降低；脱落酸（ABA）质量分数大幅降低，赤霉素（GA3），生长素（IAA）和玉米素核苷（ZR）质量分数及与ABA的比值均呈现出不同程度的增长趋势。低温层积前后的比较发现，铁冬青、冬青和全缘冬青种子ABA质量分数由层积前高于到层积后低于小果冬青，而GA3 /ABA比值从层积前低于到层积后高于小果冬青，这可能是解除其种子休眠的原因之一。测定结果还发现铁冬青和冬青种子在解休眠过程中生理变化较为一致，而与全缘冬青则有一定差异，这与铁冬青和冬青两者亲缘关系较近有关。图1表2参13Abstract: Three Ilex species：Ilex rotunda，I. chinensis，and I. integra，were compared with I. micrococca （a control which did not have deep dormancy），for physiological responses to seed dormancy-breaking. The medicinal components，hormones，and enzyme activities were measured during stratification. Results showed that compared to the control there was an active metabolism in seeds of the three Ilex plants with lipid content decreasing，while starches and reduced sugars increased. Catalase（CAT） activity decreased；peroxidase（POD） activity increased；and abscisic acid （ABA） content decreased. Ratios of gibberellic acid （GA3）/ABA，indole-acetic acid （IAA）/ABA，and zeatin-riboside （ZR）/ABA increased. Before stratification ABA in I. rotunda，I. chinensis，and I. integra was higher than I. micrococca，but after stratification it was lower. Also，before stratification GA3 /ABA in I. rotunda，I. chinensis，and I. integra was lower than the control but higher after stratification. Additionally，compared to I. micrococca，I. rotunda and I. chinensis had similar characteristics. ［Ch，1 fig. 2 tab. 13 ref.］
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Key words:
- Ilex rotunda /
- Ilex chinensis /
- Ilex integra /
- seed /
- dormancy-breaking /
- physiological mechanism /
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.04.008
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