| 脱落酸对低温胁迫下玉米幼苗生长和光合特性的影响 |
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| 引用本文： | 田礼欣,杨晔,左师宇,刘旋,魏湜,孙磊,李晶.脱落酸对低温胁迫下玉米幼苗生长和光合特性的影响[J].作物杂志,2018,34(6):76-152. |
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| 作者姓名： | 田礼欣 杨晔 左师宇 刘旋 魏湜 孙磊 李晶 |
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| 作者单位： | 1 东北农业大学农学院,150030,黑龙江哈尔滨2 黑龙江省农业科学院土壤肥料与环境资源研究所,150086,黑龙江哈尔滨 |
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| 基金项目： | 国家重点研发计划(2017YFD0300400) |
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| 摘 要： | 脱落酸（ABA）是作物生产中广泛应用的一种植物激素。探究ABA对低温胁迫下玉米幼苗光合特性的影响,为阐明低温胁迫下玉米幼苗叶片光合结构的防御保护机制提供理论依据。以玉米品种“久龙5号”为试验材料,采用盆栽试验,探讨了低温胁迫0、2、4、6、8d下不同浓度脱落酸对玉米幼苗生长及光合特性的影响。结果表明,低温胁迫显著抑制玉米幼苗的正常生长,导致SPAD值下降,叶片净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、PSⅡ光化学最大效率（Fv/Fm）和潜在光化学效率（Fv/Fo）水平下降,初始荧光（Fo）显著升高。外源喷施适当浓度的ABA能够显著缓解由低温胁迫导致的玉米叶片Pn、Tr和Gs下降幅度,提高Fv/Fm和Fv/Fo,降低Fo水平。由此可见,外源施加适当浓度的ABA能提高幼苗叶片的光合能力,提高PSⅡ反应中心活性,促进物质积累,提高玉米幼苗的耐冷性。同时,外源施加ABA存在一定的浓度效应,即“低促高抑”。本研究所设计浓度范围中15mg/L ABA浓度对光合抑制缓解效果最显著。
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| 关 键 词： | 玉米 脱落酸 低温胁迫 光合特性 |
| 收稿时间： | 2018-06-04 |
Effects of Abscisic Acid on Growth and Photosynthetic Characteristics of Maize Seedlings under Low Temperature Stress |
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| Tian Lixin,Yang Ye,Zuo Shiyu,Liu Xuan,Wei Shi,Sun Lei,Li Jing.Effects of Abscisic Acid on Growth and Photosynthetic Characteristics of Maize Seedlings under Low Temperature Stress[J].Crops,2018,34(6):76-152. |
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| Authors: | Tian Lixin Yang Ye Zuo Shiyu Liu Xuan Wei Shi Sun Lei Li Jing |
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| Institution: | 1 College of Agronomy, Northeast Agricultural University, Harbin 150030, Heilongjiang, China2 Institute of Soil Fertilizer and Environment Resources, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, Heilongjiang, China |
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| Abstract: | Abscisic acid (ABA) is a plant hormone widely used in the physiological and biochemical processes of plants. The effects of ABA on photosynthetic characteristics of maize seedlings under low temperature stress were explored, which provided a theoretical basis for elucidating the defense and protection mechanism of photosynthetic structure of maize seedling leaves under low temperature stress. A pot experiment of maize seedlings (variety Jiulong 5) was conducted to investigate the changes of growth and photosynthetic characteristics of maize seedlings under different concentrations of abscisic acid at 0, 2, 4, 6 and 8 days after low temperature stress. The results showed that, the normal growth of maize seedlings was inhibited significantly under chilling stress. All the decreases in SPAD value, Pn, Tr, Gs, Fv/Fm, Fv/Fo and the increases in Fo reflected the inhibitory effects of chilling stress. Exogenous appropriate concentration of ABA led to a marked increase in Pn, Tr, Gs, Fv/Fm, Fv/Fo and the reduction in Fo of maize seedlings. Therefore, exogenous appropriate concentration of ABA could promote the photosynthesis, PSⅡ reactivity and substance accumulation, as well as enhance the chilling resistance of maize seedlings. Meanwhile, exogenous ABA has a certain concentration effect, that is, “low promotion and high inhibition”. The concentration of 15mg/L ABA in the designed concentration range was the most effective in alleviating the photosynthesis inhibition of chilling stress. |
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| Keywords: | Maize Abscisic acid Chilling stress Photosynthetic characteristics |
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