油菜素内酯对盐碱胁迫下菊花幼苗生长及生理特性的影响
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2023年宁夏自然科学基金项目(2023AAC03147);2022年宁夏重点研发计划(2022BBF03035)


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    摘要:

    以菊花耐盐品种‘绚秋江月’和盐敏感品种‘绚秋尽染’为试材,用NaCl和NaHCO3按1∶1(质量比)配制成100 mmol/L复合盐碱处理液,对园林小菊幼苗进行盐碱胁迫处理,对其叶片喷施不同浓度(0.001、0.010、0.100、1.000 mg/L)外源油菜素内酯(BR),以喷施H2O为对照(CK),研究BR对盐碱胁迫下园林小菊幼苗生长及生理指标的影响。结果表明:与对照相比,在盐碱胁迫下外源喷施0.100 mg/L BR,‘绚秋江月’和‘绚秋尽染’叶片相对含水量分别提高了8.11%、16.95%;SPAD值分别增加了9.55%和13.97%;相对电导率分别下降了27.63%和24.69%;丙二醛(MDA)含量分别下降了41.24%和67.38%;脯氨酸(Pro)含量分别提高了86.49%和69.46%;过氧化氢酶(CAT)活性分别增大了16.25%和18.14%;过氧化物酶(POD)活性分别增大了46.15%和68.38%;超氧化物歧化酶(SOD)活性分别增大了12.36%和16.32%;抗坏血酸过氧化物酶(APX)活性分别增大了76.88%和95.04%。外源喷施0.100 mg/L BR可以更好地促进盐碱胁迫下园林小菊幼苗的生长发育,提高抗氧化酶活性,增强生物膜的稳定性,从而起到缓解盐碱胁迫对菊花幼苗的伤害,且对盐敏感品种‘绚秋尽染’盐碱受害的缓解效果更佳。

    Abstract:

    In this study, the salt-tolerant chrysanthemum cultivar ‘Xuanqiu Jiangyue’ and the salt-sensitive cultivar ‘Xuanqiu Duran’ were used as test materials, and NaCl and NaHCO3 were mixed with 1∶1 mass ration to prepare a compound saline-alkali solution at the concentration of 100 mmol/L. The seedlings of chrysanthemum were treated with saline-alkali stress, and the leaves were sprayed with four concentrations(0.001, 0.010, 0.100, 1.000 mg/L) of exogenous brassinolide(BR) with the H2O as the control(CK). The effects of BR on the growth and physiological indexes of chrysanthemum seedlings under saline-alkali stress were studied. The results showed that compared with the control, the relative water contents of the leaves of ‘Xuanqiu Jiangyue’ and ‘Xuanqiu Duran’ increased by 8.11% and 16.95%, respectively, and the chlorophyll contents increased by 9.55% and 13.97%, respectively, when sprayed with 0.100 mg/L BR under saline-alkali stress. The relative conductivities decreased by 27.63% and 24.69%, respectively. The contents of malondialdehyde(MDA) decreased by 41.24% and 67.38%, respectively. The contents of proline(Pro) increased by 86.49% and 69.46%. The activities of catalase(CAT) increased by 16.25% and 18.14%, respectively. The activities of peroxidase(POD) increased by 46.15% and 68.38%, respectively. The activities of superoxide dismutase(SOD) increased by 12.36% and 16.32%, respectively. The activities of ascorbate peroxidase(APX) increased by 76.88% and 95.04%, respectively. In summary, exogenous spraying of 0.100 mg/L BR could better promote the growth and development of chrysanthemum seedlings under saline-alkali stress, improve the activity of antioxidant enzymes and the stability of biofilms, thereby alleviate the damage of saline-alkali stress to chrysanthemum seedlings, and the alleviation effect of salt-alkali damage of salt-sensitive variety ‘Xuanqiu Duran’ was more obvious.

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王玲玲,虎淘淘,张昕怡,马潇源,张黎,靳磊,严瑞.油菜素内酯对盐碱胁迫下菊花幼苗生长及生理特性的影响[J].湖南农业大学学报:自然科学版,2024,50(3):.

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  • 在线发布日期: 2024-07-22
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