【摘要】：為探索根區(qū)降溫條件對葡萄(Vitis vinifera)葉片凍害的影響,以1年生美樂葡萄(V.vinifera cv.‘Merlot’)幼苗為試材,設(shè)置根區(qū)正常降溫和緩沖降溫2種降溫條件,人工模擬霜凍,分析了葉片凍害指數(shù)和葉片的熒光參數(shù)。結(jié)果表明,根區(qū)正常降溫會導(dǎo)致根系受凍,同時葉片發(fā)生嚴(yán)重的凍害,凍害指數(shù)達(dá)74.36%;根區(qū)緩沖降溫使根區(qū)溫度保持在0°C以上,葉片凍害指數(shù)降低53.29%,僅有21.07%的葉片遭受了凍害。根區(qū)緩沖降溫處理能有效提高葉片霜凍恢復(fù)過程中光化學(xué)淬滅系數(shù)(qP)和天線色素轉(zhuǎn)化效率(F_v~'/F_m~'),加快PSII光合電子傳遞量子效率(Φ_(PSII))的恢復(fù),提高熱耗散能力(NPQ),減輕霜凍后的光抑制(F_v/F_m),有利于葉片霜凍后的恢復(fù)。
[Abstract]:In order to explore the effect of root zone cooling conditions on the freezing injury of (Vitis vinifera) leaves of grape, the seedlings of V.vinifera cv. Merlot', one year old, were used as test materials. Two cooling conditions, normal cooling and buffer cooling, were set up to simulate frost artificially. The freezing injury index and fluorescence parameters of leaves were analyzed. The results showed that the normal cooling of root zone would result in the freezing of root system, and the freezing injury index of leaves was 74.360.The temperature of root zone could be kept above 0 擄C by buffer cooling of root zone, and the index of freezing injury of leaves decreased by 53.29%, and only 21.07% of leaves suffered from freezing injury. The root zone buffer and cooling treatment can effectively improve the photochemical quenching coefficient (qP) and the conversion efficiency of antenna pigment (FV / FM), and accelerate the recovery of PSII photosynthetic electron transport (桅 _ (PSII) during the frost recovery of leaves. Improving the heat dissipation ability of (NPQ), can reduce the light inhibition (F_v/F_m) after frost, which is beneficial to the recovery of leaves after frost.
【作者單位】： 山東農(nóng)業(yè)大學(xué)園藝科學(xué)與工程學(xué)院/作物生物學(xué)國家重點實驗室;
【基金】：國家現(xiàn)代葡萄產(chǎn)業(yè)技術(shù)體系建設(shè)專項(No.CARS-30) 長江學(xué)者和創(chuàng)新團隊發(fā)展計劃(No.IRT15R42)
【分類號】：S426;S663.1

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