| 刘馨,游诗尧,周海霞,祁娟霞,张雪艳.钙离子浓度对NaCl胁迫下嫁接黄瓜幼苗光合与荧光特性的影响[J].干旱地区农业研究,2018,36(4):193~199 |
| 钙离子浓度对NaCl胁迫下嫁接黄瓜幼苗光合与荧光特性的影响 |
| Effects of calcium ion concentration on photosynthetic and fluorescence characteristics of grafted cucumber seedlings under NaCl stress |
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| DOI：10.7606/j.issn.1000-7601.2018.04.28 |
| 中文关键词: 嫁接黄瓜幼苗 NaCl胁迫 Ca2+浓度 光合特性 荧光特性 |
| 英文关键词:grafted cucumber seedlings concentrations of Ca2+ photosynthetic characteristics fluorescence characteristics |
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| 中文摘要: |
| 针对宁夏设施土壤盐渍化严重，作物盐害加剧等问题，以嫁接黄瓜幼苗为试验材料，研究100 mmol·L-1 NaCl处理下，施用不同浓度CaCl2对嫁接黄瓜幼苗光合和荧光特性的影响。结果表明：随着胁迫时间的延长，不同钙离子浓度处理下黄瓜幼苗叶片净光合速率(Pn)、气孔导度(Gs)均降低，蒸腾速率(Tr)、胞间CO2浓度(Ci)先下降后升高，10 mmol·L-1 Ca2+处理显著增加了植株的水分利用率；处理第11天，除10 mmol·L-1 Ca2+处理外，其他处理初始荧光均呈上升趋势，10 mmol·L-1 Ca2+处理的Fo值最低，仅为787.4，最大荧光(Fm)较高，仅次于CK，施入10 mmol·L-1 Ca2+可显著增加最大光化学效率(Fv/Fm)，分别为其他5个Ca2+浓度处理的17.69、1.33、1.66、2.82倍与1.22倍；当处理第11天，各处理qP值均出现上升的趋势，10 mmol·L-1 Ca2+处理的qP为0.677且接近于CK，经不同浓度CaCl2处理后，各处理间非光化学猝灭系数(qN)差异不显著，10 mmol·L-1 Ca2+处理的光合电子传递速率(ETR)显著高于其他处理。综上所述，施用10 mmol·L-1 Ca2+可显著缓解盐分对黄瓜幼苗的伤害，提高其耐盐性。 |
| 英文摘要: |
| In order to solve the problems of serious protected soil salinization in Ningxia and increasing salt damagetocrop, the grafted cucumber seedlings were used as experimental materials, to explore the effects of different concentrations of exogenous CaCl2 on photosynthetic and fluorescence characteristics of grafted cucumber seedlings under 100 mmol·L-1 NaCl stress. The results showed that,net photosynthetic rate (Pn), stomatal conductance (Gs) of cucumber seedlings declinedand, transpiration rate (Tr) and intercellular CO2 concentration (Ci) declined at first and then increased,under the treatment of gradient calcium concentration, 10 mmol·L-1 Ca2+ had significantly increased plant water use efficiency. On the 11 days of treatment, The initial fluorescence showed an rising trend in all but 10 mmol·L-1 Ca2+ treatment. the lowest Fo value of 10 mmol·L-1 Ca2+ treatment was 787.4, maximum fluorescence (Fm) was second only to CK, exogenous 10 mmol·L -1 Ca2+ can significantly increase the maximal photochemical efficiency (Fv/Fm), which were 17.69 times, 1.33 times, 1.66 times, 2.82 times and 1.22 timesofthe other 5 Ca2+ concentration treatments. On the 11 days of treatment, the qP values of all treatments showed an rising trend, the10 mmol·L-1 Ca2+ treatment with qP of 0.677 wasthe closest to CK. After different concentrations of CaCl2 treatment, there was no significant difference in non photochemical quenching coefficient (qN) between the treatments. The photosynthetic electron transfer rate (ETR) from 10 mmol·L-1 Ca2+ treatmentwas significantly higher than that from other treatments. In summary, exogenous 10 mmol·L-1 Ca2+ could significantly alleviate thesalt damage to cucumber seedlings and improve its salt tolerance. |
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