丛枝菌根对干旱胁迫下油用牡丹幼苗光化学活性的影响
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国家自然科学基金项目(U1804233);河南省教育厅项目(19A2180002)


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    摘要:

    采用盆栽法,对重度干旱(土壤相对含水量为30%)和轻度干旱(土壤相对含水量为55%)胁迫3 d和6 d的接种丛枝菌根真菌(Gigaspora rosea)的油用牡丹‘凤丹’幼苗叶片叶绿素荧光参数进行测定。结果显示:与未接菌相比,干旱胁迫下接菌‘凤丹’的PSII潜在活性Fv/Fo和性能指数PIabs均升高;重度干旱胁迫3、6 d,接菌‘凤丹’的Mo和Vj较未接菌处理分别显著降低14.5%、29.8%和12.9%和16.2%,φEo和φo分别显著提高9.7%、52.2%和8%、23.6%;与未接菌相比,轻度干旱胁迫3、6 d,接菌‘凤丹’的单位面积吸收的光能ABS/CSo、单位面积捕获的光能Tro/CSo、单位面积电子传递的量子产额ETo/CSo、单位面积传递到PSⅠ末端的量子产额REo/CSo均提高,但不显著;重度干旱胁迫3、6 d,接菌‘凤丹’的Tro/CSo、ETo/CSo和单位面积反应中心数RC/CSm分别显著提高37.8%、41.1%、47.7%、73.8%、50.1%、141.8%;干旱胁迫下,接菌‘凤丹’的调节性能量耗散量子产量Y(NPQ)均显著高于未接菌处理,非调节性能量耗散量子产量Y(NO)显著低于未接菌处理。表明,丛枝菌根可以提高干旱胁迫下(尤其是重度干旱下)PSII反应中心活性,增加对光能的吸收和捕获,提高电子传递能力和光化学效率,同时将剩余的光能以热耗散的形式散发,从而避免光损伤,进而提高干旱胁迫下油用牡丹幼苗的光化学活性和抗旱性。

    Abstract:

    The chlorophyll fluorescence parameters of potted oil peony ‘Fengdan’ seedlings inoculated with arbuscular mycorrhizal fungus Gigasporarosea under severe drought(soil relative water content is 30%) and mild drought(soil relative water content is 55%) stress for 3 and 6 days were compared and analyzed. The results showed that the potential PSII activity Fv/Fo and performance index PIabs of ‘Fengdan’ seedlings inoculated with arbuscular mycorrhiza were increased under different drought stress compared with the non-inoculated seedlings. Compared with the non-inoculated treatment, in inoculated ‘Fengdan’ with 3 and 6 days under severe drought stress, Mo significantly decreased by 14.5% and 29.8% respectively; Vj significantly decreased by 12.9% and 16.2% respectively; φEo significantly increased by 9.7% and 52.2% respectively; and φo significantly increased by 8% and 23.6%, respectively. Compared with the non-inoculated treatment, in inoculated ‘Fengdan’ with mild drought stress for 3days and 6 days, absorption of energy per unit area(ABS/CSo), capture of light energy per unit area(Tro/CSo), quantum yield electron transfered per unit area(ETo/CSo), quantum yield transfered at the end of PSⅠ per unit area(REo/CSo) were improved, but with no significant difference. Compared with the non-inoculated treatment, in inoculated ‘Fengdan’ with under severe drought stress for 3 and 6 days, Tro/CSo were significantly increased by 37.8% and 41.1% respectively, ETo/CSo significantly increased by 47.7% and 73.8% respectively, and the number of response centers per unit area(RC/CSm) significantly increased by 50.1% and 141.8%, respectively. Under drought stress, regulatory energy dissipation quantum yield Y(NPQ) of inoculated ‘Fengdan’ was significantly higher than that of non-inoculated ‘Fengdan’, and non-regulatory energy dissipative quantum yield Y(NO) was significantly lower than that of non-inoculated. The research showed that arbuscular mycorrhizal can improve PSII reaction center activity under the drought stress, especially under the severe drought, increase the absorption and capture of light energy, improve the efficiency of electron transfer ability and light chemistry, at the same time, more remaining energy distributed in the form of heat dissipation, avoid the light damage, then improve drought resistance and photochemical activity of oil tree peony seedlings under drought stress.

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张文科,宋程威,魏冬峰,石兆勇,侯小改.丛枝菌根对干旱胁迫下油用牡丹幼苗光化学活性的影响[J].湖南农业大学学报:自然科学版,2021,47(5):.

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  • 在线发布日期: 2021-11-02
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