| 28-高芸苔素内酯对低温弱光胁迫辣椒幼苗光合和荧光特性的影响 |
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| 引用本文： | 杨万基,蒋欣梅,高欢,刘舒娅,孙天宇,马创举,白国梁,于锡宏. 28-高芸苔素内酯对低温弱光胁迫辣椒幼苗光合和荧光特性的影响[J]. 南方农业学报, 2018, 49(4): 741-747. DOI: 10.3969/j.issn.2095-1191.2018.04.19 |
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| 作者姓名： | 杨万基 蒋欣梅 高欢 刘舒娅 孙天宇 马创举 白国梁 于锡宏 |
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| 作者单位： | 东北农业大学 园艺园林学院,哈尔滨,150030 |
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| 摘 要： | [目的]探讨28-高芸苔素内酯(28-HBR)对低温弱光胁迫辣椒幼苗光合和荧光特性的影响,为冬春季培育辣椒壮苗提供技术支持.[方法]以辣椒品种亚洲雄风为试材,分别于正常温光[昼/夜温度24 ℃/18 ℃,光照500.0 μmol/(m2·s)]和低温弱光[昼/夜温度12℃/6℃,光照100.0 μmol/(m2·s)]下喷施清水和150.0 mg/L 28-HBR后1、5、9和13 d,测定分析各处理幼苗的生物量、叶绿素含量、气体交换参数及叶绿素荧光参数等指标.[结果]在低温弱光下,喷施150.0 mg/L 28-HBR 9 d后辣椒幼苗的生物量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、调节性能量耗散Y(NPQ)、非光化学猝灭系数NPQ和qN显著提高(P<0.05,下同),胞间CO2浓度(Ci)显著下降;处理13 d后,辣椒幼苗的生物量、Pn、Y(NPQ)、NPQ和qN显著下降,而叶绿素a/b(Chla/b)和Ci显著升高.相关性分析结果表明,生物量与叶绿素a(Chla)含量、叶绿素b(Chlb)含量、Gs、Tr、qN和qP呈显著正相关.[结论]喷施150.0 mg/L 28-HBR可促进低温弱光胁迫辣椒幼苗的光合作用,使其生物量增加,Y(NPQ)提高,从而保护光合系统,缓解低温弱光胁迫对辣椒幼苗造成的伤害.
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| 关 键 词： | 辣椒幼苗 28-高芸苔素内酯 低温弱光胁迫 光合特性 |
Effects of 28-homobrassinolide on photosynthetic and fluorescence characteristics of pepper seedlings under low temperature with dim light |
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| YANG Wan-ji,JIANG Xin-mei,GAO Huan,LIU Shu-ya,SUN Tian-yu,MA Chuang-ju,BAI Guo-liang,YU Xi-hong. Effects of 28-homobrassinolide on photosynthetic and fluorescence characteristics of pepper seedlings under low temperature with dim light[J]. Journal of Southern Agriculture, 2018, 49(4): 741-747. DOI: 10.3969/j.issn.2095-1191.2018.04.19 |
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| Authors: | YANG Wan-ji JIANG Xin-mei GAO Huan LIU Shu-ya SUN Tian-yu MA Chuang-ju BAI Guo-liang YU Xi-hong |
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| Abstract: | [Objective]Effects of 28-homobrassinolide(28-HBR)on photosynthetic characteristics and fluorescence characteristics of pepper seedlings under low temperature with dim light were explored in order to provide reference for culture of pepper seedlings in winter and spring seasons.[Method]The pepper variety Yazhouxiongfeng was used as mate-rial.The seedlings were sprayed with clear water and 150.0 mg/L 28-HBR under normal temperature and light[night/day temperature 24℃/18℃,light 500.0 μmol/(m2·s)]and low temperature with dim light[night/day temperature 12℃/6℃, light 100.0 μmol/(m2·s)]respectively. Biomass,chlorophyll content,gas exchange parameters and chlorophyll fluores-cence parameters of pepper seedlings were measured 1,5,9 and 13 d after treatments.[Result]Under low temperature with dim light,biomass,net photosynthesis rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),regulated energy dissipation of the quantum yield Y(NPQ),non photochemical quenching coefficient(NPQ),qN of the pepper seedlings 9 d after spraying 150.0 mg/L 28-HBR 9 d significantly increased(P<0.05,the same below),but intercellular CO2concen-tration(Ci)significantly decreased.After 13 d of treatment,the results showed that the biomass,Pn,Y(NPQ),NPQ and qN significantly decreased,but chlorophyll a/b(Chla/b)and Cisignificantly increased.The correlation analysis indicated that,biomass had significant positive correlation with chlorophyll a(Chla)content,chlorophyll b(Chlb)content,Pn, Gs,Tr,qN and qP.[Conclusion]Spraying 150.0 mg/L 28-HBR can improve photosynthesis of pepper seedlings under low temperature with dim light,thereby protects photosynthetic system,and reduces the damage on pepper seedlings caused by low temperature with dim light. |
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