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赤霉素对盐胁迫下樱桃萝卜种子萌发和生长的影响

Effects of Gibberellin on Seed Germination and Growth of Cherry Radish under Salt Stress

DOI：

英文关键词:Keywords: salt stress cherry radish gibberllin root chlorophyll

基金项目:基金项目：国家星火计划（2012GA750006）。

作者	单位
郭　佳1 ，王凤华2*，赵峻杰2 ，蔡金金2 ，蒋　燕2	（1.南京国环有机产品认证中心有限公司，江苏南京 210000；2.河南科技大学园艺与植物保护学院，河南洛阳 471000）

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中文摘要:

摘要：为探索缓解樱桃萝卜盐胁迫效应的化学调控措施，研究了NaCl（0、50、100、150 mmol/L）胁迫对樱桃萝卜种子萌发和幼苗生长的影响以及赤霉素（0、10、20、30、40 mg/L）对100 mmol/L NaCl胁迫的调控作用。结果表明：NaCl胁迫显著抑制了樱桃萝卜种子的萌发和幼苗生长，且NaCl浓度越大，抑制作用越强。在100 mmol/L NaCl处理下，种子发芽率、发芽势、发芽指数、活力指数、株高、单株鲜质量、根长、根表面积、根投影面积、根体积、根平均直径、根尖数、根分枝数、根系活力、叶绿素a含量、叶绿素b含量分别较对照显著降低4.33百分点、5.33百分点、30.05%、26.01%、20.88%、19.52%、50.08%、70.27%、70.83%、100.00%、23.08%、15.69%、22.73%、10.67%、12.86%、23.81%，过氧化氢酶（CAT）活性较对照显著提高13.51%。在100 mmol/L NaCl胁迫下，采用30 mg/L赤霉素进行调控处理，樱桃萝卜的种子发芽率、发芽势、发芽指数、活力指数、根长、根表面积、根投影面积、根平均直径、根尖数、根分枝数、株高、叶绿素a含量、叶绿素b含量分别较对照显著提高4.78百分点、12.96百分点、23.09%、42.03%、108.44%、135.29%、140.00%、79.17%、15.45%、114.29%、15.38%、41.67%、70.00%，CAT活性则较对照显著下降33.33%，根系生长发育得到显著改善，株高和叶绿素含量均显著增加；但是当赤霉素浓度为40 mg/L时，效果开始减弱。说明低浓度赤霉素可以缓解盐胁迫对樱桃萝卜造成的抑制作用，但是浓度过高可能会造成新的胁迫，30 mg/L赤霉素是缓解樱桃萝卜盐胁迫的合适浓度。

英文摘要:

Abstract: In order to explore the chemical regulation measures to alleviate the salt stress effect of cherry radish, the effects of NaCl (0, 50, 100, 150 mmol/L) stress on seed germination and seedling growth of cherry radish and the regulation of gibberellin (0, 10, 20, 30, 40 mg/L) under 100 mmol/L NaCl stress condition were studied. The results showed that NaCl stress significantly inhibited the seed germination and seedling growth of cherry radish, and the higher the concentration of NaCl the greater the inhibition. Under 100 mmol/L NaCl treatment, seed germination rate, germination vigor, germination index, vitality index, plant height, fresh weight per plant, root length, root surface area, root projection area, root volume, root average diameter, root tip number, root branch number, root vigor, chlorophyll a content, chlorophyll b content significantly decreased by 4.33 percentage points, 5.33 percentage points, 30.05%, 26.01%, 20.88%, 19.52%, 50.08%, 70.27%, 70.83%, 100.00%, 23.08%, 15.69%, 22.73%, 10.67%, 12.86%, 23.81% than that of the control, respectively, while the activity of catalase (CAT) significantly increased by 13.51% compared with the control. Under 100 mmol/L NaCl and 30 mg/L gibberellin treatment, the germination rate, germination vigor, germination index, vitality index, root length, root surface area, root projection area, root average diameter, root tip number, root branch number, plant height, chlorophyll a content, chlorophyll b content significantly increased by 4.78 percentage points, 12.96 percentage points, 23.09%, 42.03%, 108.44%, 135.29%, 140.00%, 79.17%, 15.45%, 114.29%, 15.38%, 41.67%, 70.00% than that of the control, respectively, while the activity of CAT significantly decreased by 33.33% compared with the control, the growth and development of root were significantly improved, and both of plant height and leaf chlorophyll content were significantly increased. However, when the concentration of gibberellin was 40 mg/L, the alleviated effect began to weaken. It indicated that low concentration of gibberellin could alleviate the inhibition of salt stress on cherry radish, but high concentration might cause new stress, 30 mg/L gibberllin was the appropriate concentration to alleviate salt stress of cherry radish.

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