Genotypic Differences in the Responses of Gas Exchange, Chlorophyll Fluorescence, and Antioxidant Enzymes to Aluminum Stress in Festuca arundinacea
Genotypic Differences in the Responses of Gas Exchange, Chlorophyll Fluorescence, and Antioxidant Enzymes to Aluminum Stress in Festuca arundinacea
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羊茅气体交换、叶绿素荧光和抗氧化酶对铝胁迫反应的基因型差异
DOI：
10.1134/s102144371103006x
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发表时间：
2011-07-01
影响因子：
1.4
通讯作者：
Jia, X. L.
中科院分区：
文献类型：
--
作者：
Jin, S. H.;Li, X. Q.;Jia, X. L.
研究了铝胁迫下8个高羊茅品种的气体交换、叶绿素荧光和抗氧化活性。结果表明，在铝胁迫条件下，叶片净光合速率(P(N))和气孔导度(g(S))下降，胞间CO2浓度(C(I))稳定或升高。Al胁迫后，开放PSII反应中心的激发捕获效率(F‘(V)/F’(M))、PSII光化学最大量子产率(F(V)/F(M))、PSII电子传递量子产率(Phi(PSII))和光化学猝灭(QP)均降低，而非光化学猝灭(NPQ)增加。此外，铝胁迫还提高了高羊茅各品种的抗氧化活性和丙二醛含量。然而，耐铝品种与铝敏感品种之间存在着较大的基因型差异。简历。Barrington是最敏感的品种，cv.交火2号是耐性最强的品种。天线色素不能有效地耗散过多的激发能，不能有效地清除活性氧，从而导致cv膜脂过氧化。巴灵顿在铝胁迫条件下。
In this study, the gas exchange, chlorophyll fluorescence, and antioxidant activity in eight tall fescue cultivars were investigated under aluminum stress. The results showed that the net photosynthetic rate (P(N)) and stomatal conductance (g(s)) were decreased, while the intercellular CO(2) concentration (C(i)) was stable or increased under Al stress conditions. The efficiency of excitation capture by open PSII reaction centers (F'(v)/F'(m)), the maximum quantum yield of PSII photochemistry (F(v)/F(m)), the quantum yield of PSII electron transport (Phi(PSII)), and the photochemical quenching (qP) were also decreased after Al stress, while the non-photochemical quenching (NPQ) was increased. Moreover, Al stress increased the antioxidant activities and MDA contents in each tall fescue cultivars. However, there was a lot genotype differences between the Al-tolerant and Al-sensitive cultivars. Cv. Barrington was the most sensitive cultivar and cv. Crossfire 2 was the most tolerant cultivar. The excessive excitation energy could not be dissipated efficiently by antenna pigments, and reactive oxygen species could not be scavenged efficiently, thereby resulting in membrane lipid peroxidation in cv. Barrington under Al stress conditions.