外源褪黑素调控活性氧代谢诱导梨果实抗采后黑斑病

doi:10.16420/j.issn.0513-353x.2021-0159

园艺学报 ›› 2022, Vol. 49 ›› Issue (5): 1102-1110.doi: 10.16420/j.issn.0513-353x.2021-0159

外源褪黑素调控活性氧代谢诱导梨果实抗采后黑斑病

向妙莲¹, 吴帆¹, 李树成¹, 马巧利¹, 王印宝¹, 肖刘华¹, 陈金印¹^,², 陈明¹^,^*()

¹江西农业大学农学院,江西省果蔬采后处理关键技术与质量安全协同创新中心,江西省果蔬保鲜与无损检测重点实验室,南昌 330045
²萍乡学院,江西萍乡 337055

收稿日期:2022-01-12 修回日期:2022-02-28 出版日期:2022-05-25 发布日期:2022-05-25
通讯作者: 陈明 E-mail:mingchen@jxau.edu.cn
基金资助:
江西省果蔬采后处理关键技术及质量安全协同创新中心项目(JXGS-03);江西省教育厅研究项目(GJJ160355);江西省教育厅青年科学基金项目项目(GJJ13255)

Exogenous Melatonin Regulates Reactive Oxygen Metabolism to Induce Resistance of Postharvest Pear Fruit to Black Spot

XIANG Miaolian¹, WU Fan¹, LI Shucheng¹, MA Qiaoli¹, WANG Yinbao¹, XIAO Liuhua¹, CHEN Jinyin¹^,², CHEN Ming¹^,^*()

¹Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province,Jiangxi Key Laboratory for Postharvest Technology and Non-destructive Testing of Fruits & Vegetables,College of Agronomy,Jiangxi Agricultural University,Nanchang 330045,China
²Pingxiang University,Pingxiang,Jiangxi 337055,China

Received:2022-01-12 Revised:2022-02-28 Online:2022-05-25 Published:2022-05-25
Contact: CHEN Ming E-mail:mingchen@jxau.edu.cn

摘要/Abstract

摘要：

为探究外源褪黑素（Melatonine,MT）诱导梨果实抗采后黑斑病的作用,以‘翠冠’梨为材料,测定MT对梨黑斑病菌（Alternaria alternata）的抑菌作用和诱导果实抗黑斑病的效应。结果表明,0.025 ~ 0.300 mmol · L^-1 MT处理对A. alternata菌丝生长和孢子萌发均无明显抑制作用,但MT处理梨果实可显著降低黑斑病发生,其中0.100 mmol · L^-1 MT诱导梨抗黑斑病的效应最高可达45.04%。与对照相比,0.100 mmol · L^-1 MT处理显著提高了梨果实过氧化氢酶（CAT）、超氧化物歧化酶（SOD）、过氧化物酶（POD）、抗坏血酸过氧化物酶（APX）和多酚氧化酶（PPO）活性和总酚含量,有效降低丙二醛（MDA）积累,暗示MT处理诱导梨果实对黑斑病的抗性可能与其调控活性氧代谢有关。

关键词: 梨, 果实, 黑斑病, Alternaria alternata, 褪黑素, 诱导抗病, 活性氧代谢

Abstract:

‘Cuiguan’pears were used as materials to explore the effect of exogenous melatonin（MT）on the induced resistance to postharvest pear black spot caused by Alternaria alternata. To this end,the resistance to A. alternata and black spot were detected in MT treated pear fruits. The results showed that MT treatment（0.025-0.300 mmol · L^-1）had no significant inhibition on mycelial growth and spore germination rate of A. alternata. However,it could remarkably reduce black spot of pear fruit and 0.100 mmol · L^-1 MT treatment had the highest induced resistance effect of 45.04%. In comparison with the control,the activities of CAT,SOD,POD,APX and PPO,as well as the content of total phenolics,were obviously increased in 0.100 mmol · L^-1 MT treated fruits and the accumulation of MDA was just effectively reduced on the contrary. The above results indicated that exogenous melatonin inducing pear fruit resistance against A. alternata infection might be related to the regulation of reactive oxygen species metabolism.

Key words: pear, fruit, black spot, Alternaria alternata, melatonin, induced resistance, reactive oxygen metabolism

中图分类号:

S661.2

向妙莲, 吴帆, 李树成, 马巧利, 王印宝, 肖刘华, 陈金印, 陈明. 外源褪黑素调控活性氧代谢诱导梨果实抗采后黑斑病[J]. 园艺学报, 2022, 49(5): 1102-1110.

XIANG Miaolian, WU Fan, LI Shucheng, MA Qiaoli, WANG Yinbao, XIAO Liuhua, CHEN Jinyin, CHEN Ming. Exogenous Melatonin Regulates Reactive Oxygen Metabolism to Induce Resistance of Postharvest Pear Fruit to Black Spot[J]. Acta Horticulturae Sinica, 2022, 49(5): 1102-1110.

图/表 5

表1 不同浓度外源MT对Alternaria alternate的抑菌作用

Table 1 Effects of different concentrations of exogenous MT on the inhibition of Alternaria alternate

MT/（mmol · L^-1）	孢子萌发率/% Spore germination rate	菌落直径/cm Diameter of colony
0（对照Control）	98.67 ± 1.25 a	4.83 ± 0.31 a
0.025	98.00 ± 1.41 a	4.67 ± 0.25 a
0.050	97.33 ± 1.25 a	4.68 ± 0.10 a
0.100	98.00 ± 0.82 a	4.57 ± 0.12 a
0.200	97.67 ± 1.25 a	4.87 ± 0.05 a
0.300	98.33 ± 1.24 a	4.53 ± 0.12 a

表2 不同浓度MT处理对梨果实抗采后黑斑病的效应

Table 2 Effects of different concentrations of MT induced resistance of postharvest pear fruit to black spot

MT/（mmol · L^-1）	病斑直径/mm Lesion diameter	诱导效应/% Induction effect
0（对照Control）	23.96 ± 2.76 a	—
0.025	15.63 ± 1.69 bc	34.78 ± 3.54 bc
0.050	14.29 ± 0.83 cd	40.35 ± 1.73 b
0.100	13.17 ± 1.34 d	45.04 ± 2.80 a
0.200	16.38 ± 2.60 b	31.65 ± 5.41 c
0.300	16.58 ± 1.89 b	30.78 ± 3.94 c

表3 0.100 mmol · L-1 MT不同处理时间对梨果实抗采后黑斑病的效应

Table 3 Effects of different treatment time of 0.100 mmol · L-1 MT induced resistance of postharvest pear fruit to black spot

时间/h Time	病斑直径/mm Lesion diameter	诱导效应/% Induction effect
0（对照Control）	20.38 ± 2.45 a	—
24	15.74 ± 0.64 b	22.77 ± 3.16 d
36	12.53 ± 0.98 d	38.51 ± 4.36 b
48	11.21 ± 0.86 e	44.96 ± 4.22 a
60	12.00 ± 0.69 de	41.10 ± 3.37 ab
72	13.63 ± 1.54 c	33.13 ± 3.57 c

图1 MT处理对接种Alternaria alternata梨果实中CAT、POD、PPO、SOD和APX活性的影响 *和**分别表示接种后同一时间,MT处理与对照差异显著（P < 0.05）或极显著（P < 0.01）。下同。

Fig. 1 Effect of melatonin treatment on CAT,POD,PPO,SOD and APX activities in pear fruit * and ** showed significant（P < 0.05）and extremely significant（P < 0.01）difference between MT treatment and control,at the same time after inoculation respectively. The same below.

图2 MT处理对接种Alternaria alternata梨果实MDA和总酚含量的影响

Fig. 2 Effect of MT treatment on content of MDA and total phenol in pear fruits

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外源褪黑素调控活性氧代谢诱导梨果实抗采后黑斑病

Exogenous Melatonin Regulates Reactive Oxygen Metabolism to Induce Resistance of Postharvest Pear Fruit to Black Spot

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外源褪黑素调控活性氧代谢诱导梨果实抗采后黑斑病

Exogenous Melatonin Regulates Reactive Oxygen Metabolism to Induce Resistance of Postharvest Pear Fruit to Black Spot

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