不同时期干旱胁迫对甘薯生长和抗氧化能力的影响

doi:10.3864/j.issn.0578-1752.2020.06.005

Abstract

Abstract:

【Objective】 The aim of this study was to investigate the mechanism of yield reduction of sweetpotato (Ipomoea batatas (L.) Lam) caused by drought stress at different growth stages, so as to provide theoretical basis and technical support for production of sweetpotato in dryland areas. 【Method】 Field experiments were conducted under a rain exclusion shelter to investigate the effects of drought treatments at different growth stages on growth and the activity of antioxidant enzymes in sweetpotato. Two sweetpotato cultivars (JS 21, a drought-tolerant cultivar, and JZ 1, a drought-sensitive cultivar) were subjected to four drought stress treatments respectively, including WW (well watered during the whole growth period, constructed as a control), DS1 (drought stress during the establishment stage), DS2 (drought stress during the intermediate stage), and DS3 (drought stress during the final stage). 【Result】 Drought stress resulted in significant decrease of dry weight in sweetpotato, and which declined most under the earliest drought stress. Compared with the control, the dry weight of storage roots of DS1, DS2 and DS3 in drought-tolerant cultivar (JS 21) were 32.24%, 30.68% and 13.76%, respectively, while 44.02%, 39.54% and 17.87% in drought-sensitive cultivar (JZ 1), respectively. The activity of antioxidant enzymes of functional leaves, fibrous roots and storage roots increased after drought stress. Similarly, the earlier of the drought stress, the greater influence on the activity of antioxidant enzymes was observed in sweetpotato. The enzyme activity in the fibrous roots in each stage was higher than that in the storage roots and the functional leaves. Our results indicated that the fibrous roots were the most sensitive to drought stress. Drought stress could lead to the increase of the relative electrical conductivity of functional leaves, and the MDA content in functional leaves, fibrous roots and storage roots of sweetpotato. The earlier the application of the drought stress in sweetpotato, the greater the increase of the MDA content was observed. 【Conclusion】 The earlier of the drought stress, the greater influence on the activity of antioxidant enzymes was observed in sweetpotato, and could not be renovated. Therefore, the normal growth of leaves and roots were inhibited, and the formation and bulking of storage roots were limited. Establishment stage of sweetpotato was the most sensitive to drought stress.

Key words: sweetpotato, drought stress, yield, activity of antioxidant enzymes

HaiYan ZHANG,BeiTao XIE,BaoQing WANG,ShunXu DONG,WenXue DUAN,LiMing ZHANG. Effects of Drought Treatments at Different Growth Stages on Growth and the Activity of Antioxidant Enzymes in Sweetpotato[J].Scientia Agricultura Sinica, 2020, 53(6): 1126-1139.

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Figures/Tables 13

Table 1

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Table 4

Fig. 1

Fig. 2

Fig. 3

Table 5

Effects of drought stress at different stages on activities of SOD, POD, CAT, and APX of functional leaves in sweetpotato (U·g-1 FW)"

处理 Treatment	酶活性 Enzymatic activity	栽植后天数 Days after planting（d）
		济薯21 JS 21				济紫薯1号 JZ 1
		40	60	80	100	40	60	80	100
WW	SOD酶活性 SOD activity	250.56±27.15b	406.31±26.62b	385.77±26.75b	306.22±27.15c	183.21±28.01b	289.29±27.43b	256.07±27.57b	181.75±26.15c
DS1		320.43±25.39a	361.52±25.93c	328.00±25.40c	286.58±25.39d	214.00±26.12a	249.21±26.70c	214.13±26.13c	142.27±26.12d
DS2		255.91±26.80b	445.00±27.23a	393.03±26.49b	325.25±26.80b	171.68±27.63b	299.81±28.09a	259.81±22.23b	214.27±21.63b
DS3		254.23±25.21b	410.24±26.31b	420.97±25.14a	369.18±25.21a	178.41±25.93b	281.66±27.11b	291.86±21.85a	235.48±20.93a
WW	POD酶活性 POD activity	305.25±27.07b	396.21±17.14b	362.00±27.19c	290.50±27.08a	280.55±17.15b	349.75±15.30b	318.50±20.25b	277.50±17.31b
DS1		405.90±27.23a	373.28±11.07c	296.49±21.21d	169.25±17.24c	352.69±21.29a	334.50±17.89c	231.75±22.12c	162.25±10.18c
DS2		317.74±17.25b	421.76±17.16a	382.25±27.27b	267.25±27.05b	276.81±22.30b	388.73±16.13a	323.00±23.01b	308.75±17.24a
DS3		315.25±27.17b	406.50±17.28b	395.75±17.09a	299.25±17.32a	252.80±25.06b	348.69±15.24b	367.00±17.25a	318.50±17.68a
WW	CAT酶活性 CAT activity	19.45±3.15b	35.76±1.62b	29.37±2.75b	24.46±3.15b	17.91±3.94b	29.87±1.43b	23.55±2.57b	19.32±3.25a
DS1		30.67±1.80a	28.25±1.93c	25.45±1.40c	20.89±3.39c	23.24±2.12a	19.89±1.70c	14.33±3.13c	10.45±3.12b
DS2		20.38±1.58b	40.42±3.23a	33.67±1.49a	27.20±2.80a	17.84±1.63b	35.67±1.09a	25.52±2.29b	20.56±1.63a
DS3		19.78±0.63b	33.21±2.31b	35.21±2.14a	29.53±3.21a	18.35±2.93b	30.41±2.11b	29.56±1.85a	21.87±2.93a
WW	APX酶活性 APX activity	9.73±1.20b	18.88±0.81b	16.69±1.38a	14.23±1.58a	8.95±2.01b	16.94±0.72a	13.78±1.79ab	11.66±1.02a
DS1		15.34±0.61a	14.12±0.97c	12.73±0.70b	10.45±1.70bc	11.62±1.06a	9.95±0.85b	7.17±0.56c	5.23±1.09c
DS2		10.19±1.21b	20.21±1.62a	15.84±0.75a	11.60±1.40b	8.92±0.81b	17.84±0.54a	12.76±0.45b	9.28±0.81b
DS3		9.89±1.06b	16.61±1.16bc	17.61±1.07a	12.77±1.61ab	9.18±1.46b	16.21±1.06a	14.78±0.93a	10.94±1.96ab

Table 5

Fig. 4

Fig. 5

Table 6

Effects of drought stress at different stages on activities of SOD, POD, CAT, and APX of fibrous roots in sweetpotato (U·g-1 FW)"

处理 Treatment	酶活性 Enzymatic activity	栽植后天数 Days after planting (d)
		济薯21 JS 21				济紫薯1号 JZ 1
		40	60	80	100	40	60	80	100
WW	SOD酶活性 SOD activity	1429.78±289.17b	3253.62±216.59b	3079.03±219.65c	2402.85±209.17b	957.32±209.41b	2658.95±251.61b	2376.57±290.23b	1944.87±209.41c
DS1		2223.62±247.28a	2372.93±230.24c	2088.02±193.45d	1835.93±247.28d	1218.98±264.59a	1318.31±248.45c	1120.07±264.85c	1009.31±264.59d
DS2		1475.21±280.84b	3582.50±201.07a	3140.79±247.52b	2564.61±280.84c	859.25±245.56b	2848.40±244.89a	2408.41±229.61b	2121.29±245.63b
DS3		1460.97±243.04b	3287.04±219.26b	3378.28±273.46a	2938.00±243.04a	916.50±260.21b	2694.14±211.45b	2580.82±258.27a	2201.61±260.05a
WW	POD酶活性 POD activity	1115.75±101.22b	1388.63±61.41b	1286.00±241.38b	1071.50±81.24c	1041.64±71.44b	1249.25±91.89b	1155.5±81.76b	1092.5±71.89a
DS1		1417.70±90.68a	1319.84±83.21bc	1089.47±84.45c	707.75±71.73d	1258.07±72.15a	1103.50±81.77c	795.25±93.35c	586.75±50.54b
DS2		1153.207±71.76b	1565.29±77.47a	1446.75±83.62a	1201.75±89.16a	1030.42±98.69b	1366.19±71.39a	1169.00±65.89b	1126.25±71.73a
DS3		1145.75±89.54b	1419.50±65.85b	1387.25±75.81a	1107.75±71.97b	958.40±45.62b	1186.06±71.73bc	1301.00±75.76a	1155.5±84.56a
WW	CAT酶活性 CAT activity	90.35±12.45b	149.27±7.86b	130.11±71.28b	125.38±12.45a	85.72±11.52b	131.61±7.30b	122.65±10.05b	109.96±11.23a
DS1		134.69±9.17a	125.00±8.80c	113.80±8.13c	95.56±11.17b	104.95±9.35a	91.56±8.11c	69.32±7.38c	53.80±9.35b
DS2		93.51±8.40b	173.68±12.69a	146.68±7.20a	128.80±10.40a	83.37±7.88b	145.68±6.26a	124.08±9.88b	114.24±7.88a
DS3		91.12±6.64b	144.86±9.94b	152.84±7.47a	130.12±9.64a	85.42±8.78b	133.64±5.32b	130.24±8.56a	119.48±6.78a
WW	APX酶活性 APX activity	35.12±4.15b	64.76±2.62b	59.37±8.43a	54.79±4.15a	33.57±4.21b	49.87±2.43b	47.88±3.57b	44.65±3.06a
DS1		49.90±3.39a	46.67±2.93c	42.93±2.71c	36.85±3.38b	39.98±3.05a	35.52±2.15c	28.11±4.13c	22.93±4.12c
DS2		36.17±2.80b	72.89±4.23a	53.89±2.40b	47.93±2.45a	32.79±2.63b	53.56±2.75a	44.36±3.29b	39.08±2.63b
DS3		35.37±2.21b	63.29±3.31b	60.95±2.49a	49.37±3.21a	33.47±3.11b	49.55±4.15b	50.41±2.85a	40.83±4.59b

Table 6

Fig. 6

Table 7

Effects of drought stress at different stages on activities of SOD, POD, CAT, and APX of storage roots in sweetpotato (U·g-1 FW)"

处理 Treatment	酶活性 Enzymatic activity	栽植后天数 Days after planting (d)
		济薯21 JS 21				济紫薯1号 JZ 1
		60	80	100	120	60	80	100	120
WW	SOD酶活性 SOD activity	1578.09±187.11b	2234.70±158.95b	2021.72±150.98 c	1684.19±123.11a	707.68±40.21b	1591.09±131.47b	1208.37±133.62b	799.62±78.21b
DS1		1962.34±145.01a	1888.36±168.39c	1604.01±160.16d	1276.19±120.01c	1176.99±71.21a	970.67±120.18c	877.69±121.37c	582.49±51.21c
DS2		1507.49±141.72b	2547.50±148.34a	2161.69±179.62b	1488.86±131.72b	744.22±97.88b	1648.97±141.53a	1328.97±125.66b	878.48±44.23b
DS3		1598.28±157.26b	2256.32±174.22b	2315.36±156.19a	1530.47±117.26b	781.26±78.27b	1549.15±126.42b	1605.24±135.68a	995.16±38.27a
WW	POD酶活性 POD activity	557.88±85.46b	694.32±74.28b	643.00±54.38c	535.75±44.16b	520.82±44.31b	624.63±54.59b	577.75±41.54b	516.25±34.59a
DS1		708.85±94.54a	659.92±82.14c	544.73±82.42d	353.88±34.48c	629.03±55.57a	601.75±34.51c	447.63±54.69c	343.38±30.36b
DS2		576.60±74.51b	752.65±94.31a	673.38±74.54b	588.88±44.10a	515.21±56.78b	673.10±64.26a	584.50±35.68b	523.13±44.49a
DS3		572.88±84.33b	709.75±95.13b	693.63±74.18a	568.88±34.65a	479.20±58.91b	593.03±81.01c	640.50±70.15a	537.75±34.21a
WW	CAT酶活性 CAT activity	56.90±4.45b	89.52±2.86b	76.74±4.25b	66.92±2.45b	53.81±5.98b	75.74±2.30a	63.10±4.72a	58.64±2.45a
DS1		79.35±4.17a	74.50±3.87c	68.90±2.20c	59.78±4.17c	64.47±4.35a	57.78±3.12b	46.66±5.48b	38.90±2.35b
DS2		58.76±3.45b	98.84±4.69a	85.34±2.47a	70.40±2.46a	53.69±2.88b	79.34±1.26a	68.04±3.88a	52.12±2.88a
DS3		57.56±2.61b	84.43±4.94b	88.42±4.43a	72.06±4.65a	54.71±2.78b	74.82±6.45a	70.12±2.56a	55.74±4.78a
WW	APX酶活性 APX activity	17.08±1.09b	30.17±1.21b	28.91±1.17a	24.86±0.97a	16.05±1.67b	26.25±1.53a	24.26±1.81a	21.44±1.67a
DS1		26.93±1.45a	24.78±2.54c	22.29±1.47b	18.24±1.45b	20.32±1.95a	19.35±1.07b	15.40±0.92b	12.96±1.35b
DS2		17.78±1.89b	33.60±1.19a	27.60±1.65a	22.62±2.27a	15.53±0.82b	29.37±0.84a	21.57±3.26a	18.39±1.92a
DS3		17.25±1.56b	29.19±2.39b	30.96±2.85a	23.92±2.09a	15.98±1.52b	26.70±1.88a	25.94±2.37a	19.55±1.55a

Table 7

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处理 Treatment	发根分枝期 Establishment stage (Planting-30 d)	蔓薯并长期 Intermediate stage (30-60 d)	快速膨大期 Final stage (60-90 d)
WW	75%±5%	75%±5%	75%±5%
DS1	35%±5%	75%±5%	75%±5%
DS2	75%±5%	35%±5%	75%±5%
DS3	75%±5%	75%±5%	35%±5%

处理 Treatment		栽植后天数 Days after planting (d)
		济薯21 JS 21				济紫薯1号 JZ 1
		40	60	80	100	40	60	80	100
地上部生物量 Biomass of aboveground part	WW	18.93±1.65a	58.56±2.45a	79.76±2.15a	87.24±2.77a	19.52±1.84a	62.79±2.04a	75.72±2.14a	85.13±2.63a
	DS1	13.49±1.4b	40.43±1.31c	46.43±1.87d	61.79±3.48d	13.38±0.69b	36.20±2.64c	42.24±3.56d	53.27±1.73d
	DS2	18.21±1.74a	46.49±2.26b	60.52±2.74c	73.31±3.14c	23.65±1.37a	43.56±3.15b	56.34±2.46c	68.87±3.04c
	DS3	19.56±1.88a	59.54±2.04a	70.24±2.34b	79.73±1.65b	21.61±1.04a	59.74±3.05a	66.75±3.12b	77.28±3.18b
地下部生物量 Biomass of underground part	WW	1.43±0.58a	5.39±0.36a	17.89±0.59a	31.13±0.69a	1.65±0.25a	6.82±0.79a	15.36±1.08a	30.96±1.05a
	DS1	0.83±0.35b	3.95±0.90c	11.21±0.69d	20.96±1.16d	0.81±0.25bc	3.43±0.25c	7.83±0.48d	16.26±1.12d
	DS2	1.27±0.19a	4.71±0.68b	13.72±0.66c	24.65±1.19c	1.26±0.24ab	4.41±0.57b	10.66±0.17c	22.23±0.98c
	DS3	1.36±0.77a	5.72±1.02a	16.18±0.39b	28.44±1.48b	1.73±0.38a	6.28±0.47a	13.75±1.07b	26.97±1.06b

处理 Treatment	栽植后天数 Days after planting (d)
	济薯21 JS 21				济紫薯1号 JZ 1
	40	60	80	100	40	60	80	100
WW	1.73±0.03a	4.01±0.45a	5.63±0.25a	5.21±0.38a	1.65±0.34a	4.25±0.45a	6.43±0.31a	5.85±0.34a
DS1	1.25±0.24b	2.15±0.31c	2.78±0.18d	2.08±0.05d	1.14±0.15b	2.61±0.15c	2.77±0.37d	2.33±0.21d
DS2	1.72±0.02a	3.22±0.27b	3.88±0.25c	3.27±0.04c	1.63±0.43a	3.45±0.26b	3.82±0.26c	3.46±0.25c
DS3	1.77±0.16a	3.99±0.19a	4.97±0.45b	4.54±0.25b	1.69±0.47a	4.36±0.36a	5.12±0.13b	4.63±0.19b

Effects of Drought Treatments at Different Growth Stages on Growth and the Activity of Antioxidant Enzymes in Sweetpotato

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处理 Treatment	济薯21 JS 21		济紫薯1号 JZ 1
处理 Treatment	薯干产量 Dry weight (kg·hm^-2)	相比对照 Compared with CK (%)	薯干产量 Dry weight (kg·hm^-2）	相比对照 Compared with CK (%)
WW	3210.02±149.60a	—	4192.22±117.21a	—
DS1	2175.14±104.54c	32.24	2346.95±94.03c	44.02
DS2	2225.24±134.03c	30.68	2534.54±95.57c	39.54
DS3	2768.43±143.75b	13.76	3443.27±111.90b	17.87

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