不同甘薯品种抗旱性评价及耐旱指标筛选

doi:10.3724/SP.J.1006.2019.84087

Abstract

Abstract:

Field experiments were conducted under a rain proof shelter using 15 sweetpotato cultivars with drought stress treatment and well-watered treatment. The yield and agronomic traits of different sweetpotato cultivars under drought stress were studied. The sweetpotato cultivars were classified according to the drought resistance coefficient of each cultivar. The drought-tolerant cultivars (DC ≥ 0.6) included Jishu 21, Jishu 25, Jixu 23, Jishu 15, and Yanshu 25. The moderate drought-tolerant cultivars (0.4 ≤ DC < 0.6) included Xushu 18, Jishu 26, Beijing 553, Jizishu 2, and Jishu 18. The drought-sensitive cultivars (DC < 0.4) included Zhengshu 20, Jizishu 3, Jishu 22, Jizishu 1, and Ayamaraski. Drought stress caused the decline of leaf number per plant, vine length, leaf area index and biomass which was different among cultivars. The impact of drought stress on drought-tolerant cultivars was lower than that of drought-sensitive cultivars. Under drought stress, these were significant positive correlations of drought resistance with leaf number per plant, vine length, leaf area index and biomass of different cultivars. All the agronomic traits could be used as a comprehensive evaluation index for identifying drought resistance of sweetpotato cultivars. Xushu 18 could be used as a control cultivar in the identification and screening of drought tolerance.

Key words: sweetpotato, drought tolerant, comprehensive assessment, identified index

Hai-Yan ZHANG,Bei-Tao XIE,Bao-Qing WANG,Shun-Xu DONG,Wen-Xue DUAN,Li-Ming ZHANG. Evaluation of drought tolerance and screening for drought-tolerant indicators in sweetpotato cultivars[J].Acta Agronomica Sinica, 2019, 45(3): 419-430.

Figures/Tables 9

Table 1

Table 2

Table 3

Effects of drought stress on leaf number per plant in sweetpotato"

品种 Cultivar	栽后60 d 60 DAP			栽后100 d 100 DAP
品种 Cultivar	对照Control	干旱Drought	相对值RV	对照Control	干旱Drought	相对值RV
2012
徐薯18 Xushu 18	123 ab	59 b	0.48 bc	197 b	72 cd	0.37 b
济薯15 Jishu 15	121 b	62 a	0.51 bc	203 b	80 b	0.39 ab
济薯21 Jishu 21	110 d	57 b	0.52 b	185 c	75 c	0.41 a
济徐23 Jixu 23	118 bc	61 ab	0.52 b	194 b	76 c	0.39 ab
济薯25 Jishu 25	129 a	65 a	0.50 bc	213 a	85 a	0.40 a
北京553 Beijing 553	109 d	65 a	0.60 a	178 d	68 de	0.38 ab
郑薯20 Zhengshu 20	107 d	45 d	0.42 cd	168 e	56 f	0.33 c
烟薯25 Yanshu 25	127 a	58 b	0.46 bc	201 b	65 e	0.32 c
济薯22 Jishu 22	118 bc	59 b	0.50 bc	178 d	69 de	0.39 ab
济薯26 Jishu 26	128 a	60 b	0.47 bc	215 a	79 bc	0.37 b
凌紫Ayamaraski	98 e	39 e	0.40 d	199 b	49 g	0.25 d
济薯18 Jishu 18	114 c	51 c	0.45 c	187 c	63 e	0.34 c
济紫薯1号 Jizishu 1	125 ab	60 b	0.48 bc	200 b	70 d	0.35 bc
济紫薯2号 Jizishu 2	107 d	49 cd	0.46 bc	178 d	64 e	0.36 bc
济紫薯3号 Jizishu 3	112 cd	48 cd	0.43 cd	184 c	59 f	0.32 c
2013
徐薯18 Xushu 18	134 a	65 ab	0.49 ab	213 b	79 b	0.37 bc
济薯15 Jishu 15	110 d	51 c	0.46 bc	187 ef	62 e	0.33 d
济薯21 Jishu 21	128 b	70 a	0.55 a	209 bc	89 a	0.43 a
济徐23 Jixu 23	124 bc	65 ab	0.53 a	202 cd	80 b	0.40 ab
济薯25 Jishu 25	125 bc	63 b	0.50 ab	207 c	82 b	0.40 ab
北京553 Beijing 553	113 d	55 c	0.49 ab	182 f	68 d	0.37 bc
郑薯20 Zhengshu 20	126 b	63 b	0.50 ab	191 e	73 c	0.38 bc
烟薯25 Yanshu 25	131 ab	65 ab	0.50 ab	207 c	78 b	0.38 bc
济薯22 Jishu 22	135 a	69 a	0.51 ab	198 d	79 b	0.40 ab
济薯26 Jishu 26	121 c	53 c	0.44 c	208 c	72 c	0.35 cd
凌紫Ayamaraski	87 g	35 e	0.40 d	213 b	53 f	0.25 e
济薯18 Jishu 18	130 ab	63 b	0.48 bc	221 a	75 bc	0.34 cd
济紫薯1号 Jizishu 1	98 f	47 d	0.48 bc	156 g	55 f	0.35 cd
济紫薯2号 Jizishu 2	114 d	54 c	0.47 bc	189 e	69 d	0.37 bc
济紫薯3号 Jizishu 3	104 e	45 d	0.43 cd	171	55 f	0.32 d

Table 3

Table 4

Effects of drought stress on vine length in sweetpotato (cm) "

品种 Cultivar	栽后60 d 60 DAP			栽后100 d 100 DAP
品种 Cultivar	对照Control	干旱Drought	相对值RV	对照Control		干旱Drought		相对值RV
2012
徐薯18 Xushu 18	105.64 c	69.56 cd	0.66 a	148.95 f	81.89 c		0.55 ab
济薯15 Jishu 15	91.75 d	59.45 g	0.65 ab	163.79 e	81.45 c		0.50 cd
济薯21 Jishu 21	119.34 b	78.13 b	0.65 ab	157.57 e	90.32 b		0.57 a
济徐23 Jixu 23	117.56 b	73.56 bc	0.63 b	164.32 e	92.31 b		0.56 ab
济薯25 Jishu 25	114.56 b	77.45 b	0.68 a	185.64 c	104.53 a		0.56 ab
北京553 Beijing 553	98.46 d	64.13 ef	0.65 ab	138.45 g	75.88 d		0.55 ab
郑薯20 Zhengshu 20	107.23 c	64.12 ef	0.60 cd	142.56 fg	74.79 d		0.52 bc
烟薯25 Yanshu 25	131.89 a	78.56 b	0.60 cd	201.76 b	91.86 b		0.46 de
济薯22 Jishu 22	108.76 c	67.26 de	0.62 cd	158.29 e	84.56 c		0.53 bc
济薯26 Jishu 26	134.56 a	84.56 a	0.63 b	213.22 a	101.23 a		0.47 d
凌紫 Ayamaraski	97.56 d	56.46 g	0.58 d	119.56 h	63.56 e		0.53 bc
济薯18 Jishu 18	105.46 c	61.23 fg	0.58 d	188.45 c	81.46 c		0.43 e
济紫薯1号 Jizishu 1	112.67 bc	66.76 de	0.59 d	165.45 e	86.35 bc		0.52 bc
济紫薯2号 Jizishu 2	106.87 c	63.58 ef	0.59 d	138.45 g	73.69 d		0.53 bc
济紫薯3号 Jizishu 3	112.46 bc	69.56 cd	0.62 cd	176.45 d	90.23 b		0.51 bc
2013
徐薯18 Xushu 18	91.81 e	57.18 cd	0.62 b	133.39 e	70.69 de		0.53 bc
济薯15 Jishu 15	88.08 ef	50.35 e	0.57 cd	147.64 c	68.59 de		0.46 e
济薯21 Jishu 21	94.97 de	63.48 bc	0.67 a	141.67 d	79.11 b		0.56 ab
济徐23 Jixu 23	103.26 bc	70.02 a	0.68 a	152.15 c	87.02 a		0.57 a
济薯25 Jishu 25	104.92 bc	60.04 bc	0.57 cd	148.91 c	78.24 b		0.53 bc
北京553 Beijing 553	109.98 b	65.71 ab	0.60 bc	158.61 b	78.75 b		0.50 cd
郑薯20 Zhengshu 20	83.34 f	48.12 f	0.58 bc	127.26 f	62.20 e		0.49 d
烟薯25 Yanshu 25	121.39 a	63.90 bc	0.53 d	184.09 a	78.59 b		0.43 f
济薯22 Jishu 22	94.81 de	54.97 de	0.58 bc	139.88 d	71.58 d		0.51 c
济薯26 Jishu 26	99.58 cd	59.58 cd	0.60 bc	135.09 e	74.58 cd		0.55 ab
凌紫 Ayamaraski	84.06 f	44.60 f	0.53 d	105.18 g	51.42 f		0.49 d
济薯18 Jishu 18	101.24 c	58.78 cd	0.58 bc	151.31 c	69.60 de		0.46 e
济紫薯1号 Jizishu 1	98.56 cd	52.57 e	0.53 d	149.23 c	73.30 cd		0.49 d
济紫薯2号 Jizishu 2	93.00 de	56.24 de	0.60 bc	127.55 f	65.94 e		0.52 bc
济紫薯3号 Jizishu 3	98.36 cd	61.02 bc	0.62 bc	159.79 b	77.02 bc		0.48 de

Table 4

Table 5

Effects of drought stress on leaf area index in sweetpotato"

品种 Cultivar	栽后60 d 60 DAP			栽后100 d 100 DAP
品种 Cultivar	对照Control	干旱Drought	相对值RV	对照Control	干旱Drought	相对值RV
2012
徐薯18 Xushu 18	4.23 e	2.45 cd	0.58 de	4.03 e	2.07 d	0.51 bc
济薯15 Jishu 15	3.98 e	2.64 cd	0.66 b	3.96 e	2.14 cd	0.54 b
济薯21 Jishu 21	6.01 cd	4.34 ab	0.72 a	5.86 c	3.84 a	0.66 a
济徐23 Jixu 23	6.54 bc	3.98 b	0.61 bcd	6.31 b	3.57 a	0.57 b
济薯25 Jishu 25	6.78 bc	4.32 ab	0.64 bc	6.52 b	3.79 a	0.58 b
北京553 Beijing 553	3.65 ef	2.13 d	0.58 de	3.61 ef	1.82 de	0.50 bc
郑薯20 Zhengshu 20	3.78 ef	2.34 d	0.62 bcd	3.71 ef	1.41 ef	0.38 e
烟薯25 Yanshu 25	7.12 ab	4.72 a	0.66 b	6.89 b	3.62 a	0.53 b
济薯22 Jishu 22	4.03 e	2.45 cd	0.61 bcd	4.06 e	1.72 de	0.42 de
济薯26 Jishu 26	7.86 a	4.19 b	0.53 e	7.48 a	3.84 a	0.51 bc
凌紫 Ayamaraski	2.98 f	1.65 e	0.55 e	2.87 g	1.13 f	0.39 e
济薯18 Jishu 18	3.59 ef	2.11 d	0.59 cde	3.87 e	1.79 de	0.46 cd
济紫薯1号 Jizishu 1	7.21 ab	4.37 ab	0.61 bcd	6.76 b	2.67 b	0.40 de
济紫薯2号 Jizishu 2	3.45 f	2.14 d	0.62 bcd	3.33 f	1.69 de	0.51 bc
济紫薯3号 Jizishu 3	5.35 d	2.98 c	0.56 e	4.97 d	2.58 bc	0.52 b
2013
徐薯18 Xushu 18	3.61 c	1.93 cd	0.53 c	3.16 bc	1.49 de	0.47 c
济薯15 Jishu 15	3.96 c	2.28 c	0.57 bc	3.74 b	1.89 cd	0.51 bc
济薯21 Jishu 21	3.98 c	2.72 c	0.68 a	3.46 bc	2.23 c	0.64 a
济徐23 Jixu 23	6.20 b	4.34 a	0.70 a	5.97 a	3.71 a	0.62 a
济薯25 Jishu 25	6.45 b	4.29 a	0.67 a	6.19 a	3.86 a	0.62 a
北京553 Beijing 553	3.43 c	2.10 cd	0.61 b	3.39 bc	1.79 cd	0.53 b
郑薯20 Zhengshu 20	3.57 c	2.03 cd	0.57 bc	3.50 b	1.49 de	0.43 d
烟薯25 Yanshu 25	6.56 b	4.08 ab	0.62 b	6.02 a	3.08 b	0.51 bc
济薯22 Jishu 22	3.81 c	2.32 c	0.61 b	3.03 bc	1.29 e	0.43 d
济薯26 Jishu 26	7.58 a	4.42 a	0.58 bc	6.20 a	3.17 b	0.51 bc
凌紫 Ayamaraski	2.80 d	1.64 d	0.59 bc	2.09 d	1.06 e	0.51 bc
济薯18 Jishu 18	3.83 c	2.25 c	0.59 bc	3.11 bc	1.63 d	0.52 b
济紫薯1号 Jizishu 1	6.86 b	3.72 b	0.54 c	6.41 a	2.03 c	0.32 e
济紫薯2号 Jizishu 2	3.72 c	2.21 c	0.59 bc	3.10 bc	1.56 de	0.50 bc
济紫薯3号 Jizishu 3	3.45 c	2.09 cd	0.61 b	2.91 c	1.49 de	0.51 bc

Table 5

Table 6

Effects of drought stress on biomass of aboveground part in sweetpotato (g plant-1) "

品种 Cultivar	栽后60 d 60 DAP			栽后100 d 100 DAP
品种 Cultivar	对照Control	干旱Drought	相对值RV	对照Control	干旱Drought	相对值RV
2012
徐薯18 Xushu 18	59.24 c	35.48 c	0.60 ab	85.97 d	44.53 c	0.52 bcde
济薯15 Jishu 15	50.13 cd	30.83 cd	0.62 ab	82.17 d	42.25 cd	0.51 cdef
济薯21 Jishu 21	58.78 c	38.69 bc	0.66 a	85.24 d	48.52 bc	0.57 a
济徐23 Jixu 23	65.49 b	41.19 ab	0.63 a	93.53 c	51.61 ab	0.55 ab
济薯25 Jishu 25	72.43 a	44.31 ab	0.61 ab	99.89 b	53.97 a	0.54 abc
北京553 Beijing 553	47.63 de	26.65 de	0.56 cd	75.83 e	38.70 d	0.51 cdef
郑薯20 Zhengshu 20	42.22 e	23.17 e	0.55 cd	67.22 f	30.08 e	0.45 g
烟薯25 Yanshu 25	73.84 a	45.41 a	0.61 ab	107.65 a	54.49 a	0.51 cdef
济薯22 Jishu 22	45.47 e	24.26 e	0.53 d	72.39 e	32.85 e	0.45 g
济薯26 Jishu 26	65.32 b	40.48 ab	0.62 ab	91.68 c	49.27 b	0.54 abc
凌紫 Ayamaraski	31.99 f	18.50 f	0.58 bc	57.39 g	22.75 f	0.40 h
济薯18 Jishu 18	53.12 c	30.17 cd	0.57 bc	75.57 e	35.76 de	0.47 fg
济紫薯1号 Jizishu 1	65.33 b	38.80 bc	0.59 bc	83.80 d	40.99 cd	0.49 ef
济紫薯2号 Jizishu 2	45.69 e	27.33 de	0.60 ab	63.66 f	31.81 e	0.50 def
济紫薯3号 Jizishu 3	78.26 a	49.07 a	0.63 a	105.02 a	54.99 a	0.52 bcde
2013
徐薯18 Xushu 18	65.18 c	37.15 c	0.57 cdef	96.72 d	47.82 c	0.49 cde
济薯15 Jishu 15	55.61 de	32.84 d	0.59 bcd	93.43 de	46.32 c	0.50 bcde
济薯21 Jishu 21	66.10 c	44.61 b	0.67 a	94.42 de	55.13 b	0.58 a
济徐23 Jixu 23	67.93 c	41.93 bc	0.62 bc	97.94 d	53.08 b	0.54 b
济薯25 Jishu 25	80.99 a	48.65 a	0.60 bc	112.57 b	59.76 a	0.53 bc
北京553 Beijing 553	57.04 d	30.81 de	0.54 efg	92.29 de	45.88 c	0.50 bcde
郑薯20 Zhengshu 20	50.27 e	26.46 e	0.53 fg	81.52 f	35.09 d	0.43 g
烟薯25 Yanshu 25	82.62 a	49.92 a	0.60 bc	121.50 a	60.36 a	0.50 bcde
济薯22 Jishu 22	55.20 d	28.27 e	0.51 g	89.39 e	39.18 d	0.44 fg
济薯26 Jishu 26	74.08 b	45.02 ab	0.61 bc	104.93 c	55.31 b	0.53 bc
凌紫 Ayamaraski	41.09 f	22.60 f	0.55 efg	75.88 g	28.43 e	0.37 h
济薯18 Jishu 18	54.70 de	30.14 d	0.55 efg	78.72 fg	36.13 d	0.46 efg
济紫薯1号 Jizishu 1	74.10 b	43.06 b	0.58 cde	95.71 d	45.62 c	0.48 defg
济紫薯2号 Jizishu 2	64.23 c	37.24 c	0.58 cde	90.64 de	43.82 c	0.48 defg
济紫薯3号 Jizishu 3	81.60 a	45.36 ab	0.56 def	110.23 b	57.70 ab	0.52 bcd

Table 6

Table 7

Effects of drought stress on biomass underground part in sweetpotato (g plant-1) "

品种 Cultivar	栽后60 d 60 DAP			栽后100 d 100 DAP
品种 Cultivar	对照Control	干旱Drought	相对值RV	对照Control	干旱Drought	相对值RV
2012
徐薯18 Xushu 18	5.60 de	3.08 d	0.55 de	24.03 cd	10.79 de	0.45 d
济薯15 Jishu 15	5.23 ef	2.74 de	0.52 ef	22.34 de	9.87 de	0.44 d
济薯21 Jishu 21	6.14 cd	3.98 bc	0.65 a	29.59 b	17.42 ab	0.59 a
济徐23 Jixu 23	7.45 b	4.54 b	0.61 abc	31.43 ab	17.49 ab	0.56 a
济薯25 Jishu 25	9.78 a	5.76 a	0.59 bcd	34.56 a	19.73 a	0.57 a
北京553 Beijing 553	6.25 c	3.58 cd	0.57 cd	29.76 b	15.43 bc	0.52 bc
郑薯20 Zhengshu 20	5.98 d	2.76 de	0.46 g	24.89 cd	9.67 de	0.39 e
烟薯25 Yanshu 25	6.56 c	3.87 c	0.59 bcd	29.78 b	16.45 abc	0.55 ab
济薯22 Jishu 22	7.00 b	4.31 b	0.62 ab	33.33 a	16.28 abc	0.49 c
济薯26 Jishu 26	9.56 a	5.43 a	0.57 cd	33.54 a	17.56 ab	0.52 bc
凌紫 Ayamaraski	4.37 f	2.10 e	0.48 fg	18.75 e	7.73 e	0.41 de
济薯18 Jishu 18	5.86 d	2.89 de	0.49 fg	25.02 cd	10.78 de	0.43 de
济紫薯1号 Jizishu 1	7.56 b	3.66 c	0.48 fg	28.67 bc	9.70 de	0.34 f
济紫薯2号 Jizishu 2	4.65 f	2.39 e	0.51 ef	19.88 e	8.73 e	0.44 d
济紫薯3号 Jizishu 3	6.08 cd	3.08 d	0.51 ef	29.09 b	13.21 cd	0.45 d
2013
徐薯18 Xushu 18	4.67 e	2.48 d	0.53 de	20.71 cd	9.19 cd	0.44 d
济薯15 Jishu 15	4.95 de	2.53 d	0.51 ef	21.54 cd	9.45 cd	0.44 d
济薯21 Jishu 21	4.64 e	3.06 c	0.66 a	29.41 ab	15.51 ab	0.53 abc
济徐23 Jixu 23	6.91 b	4.08 b	0.59 bc	30.17 a	16.65 ab	0.55 ab
济薯25 Jishu 25	9.07 a	5.17 a	0.57 bcd	33.11 a	18.72 a	0.57 a
北京553 Beijing 553	4.99 de	2.93 cd	0.59 bc	23.09 c	12.06 bc	0.52 bc
郑薯20 Zhengshu 20	5.58 cd	2.45 d	0.44 g	23.92 c	9.16 cd	0.38 e
烟薯25 Yanshu 25	5.46 cd	3.12 c	0.57 bcd	25.67 bc	14.07 abc	0.55 ab
济薯22 Jishu 22	6.11 bc	3.72 b	0.61 b	29.55 ab	14.37 abc	0.49 c
济薯26 Jishu 26	9.24 a	5.19 a	0.56 cd	32.74 a	17.08 a	0.52 a
凌紫 Ayamaraski	3.43 f	1.60 e	0.47 fg	15.08 e	6.16 d	0.41 d
济薯18 Jishu 18	4.18 e	1.89 e	0.45 g	18.93 de	7.97 d	0.42 d
济紫薯1号 Jizishu 1	6.08 bc	2.71 d	0.45 g	28.67 ab	10.45 cd	0.36 e
济紫薯2号 Jizishu 2	3.75 f	1.77 e	0.47 fg	16.99 e	7.29 d	0.43 d
济紫薯3号 Jizishu 3	4.50 e	2.20 de	0.49 ef	22.22 cd	9.99 cd	0.45 cd

Table 7

Table 8

Table 9

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品种类型 Cultivar type	序号 No.	品种名称 Cultivar name	选育单位 Breeding organization
淀粉型	1	徐薯18 Xushu 18	江苏徐州甘薯研究中心 Xuzhou Sweetpotato Research Center
High-starch	2	济薯15 Jishu 15	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	3	济薯21 Jishu 21	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	4	济徐23 Jixu 23	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	5	济薯25 Jishu 25	山东省农业科学院作物研究所 Crop Research Institute of SAAS
鲜食型	6	北京553 Beijing 553	原华北农业科学研究所 North China Institute of Agricultural Sciences
Table-used	7	郑薯20 Zhengshu 20	河南省农业科学院粮食作物研究所 Crop Research Institute of HAAS
	8	烟薯25 Yanshu 25	烟台市农业科学研究院 Yantai Academy of Agricultural Sciences
	9	济薯22 Jishu 22	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	10	济薯26 Jishu 26	山东省农业科学院作物研究所 Crop Research Institute of SAAS
色素型	11	凌紫Ayamaraski	日本品种 Japanese Genotype
Rich in pigment	12	济薯18 Jishu 18	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	13	济紫薯1号 Jizishu 1	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	14	济紫薯2号 Jizishu 2	山东省农业科学院作物研究所 Crop Research Institute of SAAS
	15	济紫薯3号 Jizishu 3	山东省农业科学院作物研究所 Crop Research Institute of SAAS

品种 Cultivar	2012			2013			抗旱评价 DE
	鲜薯产量 Fresh weight (kg hm^-2)		抗旱系数 DC	鲜薯产量 Fresh weight (kg hm^-2)		抗旱系数 DC
	对照Control	干旱Drought	抗旱系数 DC	对照 Control	干旱 Drought	抗旱系数 DC
徐薯18 Xushu 18	18735 fg	10305 d	0.55 ef	20970 d	11955 d	0.57 e	中抗Medium resistance
济薯15 Jishu 15	20205 de	13530 c	0.67 bc	22740 c	14325 c	0.63 d	抗Resistance
济薯21 Jishu 21	19200 ef	13635 b	0.71 a	21525 d	15720 b	0.73 a	抗Resistance
济徐23 Jixu 23	22950 b	15840 a	0.69 ab	24540 b	15945 b	0.65 c	抗Resistance
济薯25 Jishu 25	25080 a	17550 a	0.70 a	27090 a	18420 a	0.68 b	抗Resistance
北京553 Beijing 553	16350 hi	9315 e	0.57 de	18570 e	9840 e	0.53 fg	中抗Medium resistance
郑薯20 Zhengshu 20	20250 cd	7890 f	0.39 h	23400 c	8430 f	0.36 h	不抗Not resistance
烟薯25 Yanshu 25	21600 c	14040 b	0.65 c	22920 c	14445 c	0.63 cd	抗Resistance
济薯22 Jishu 22	16875 h	6405 g	0.38 h	18525 e	6480 h	0.35 hi	不抗Not resistance
济薯26 Jishu 26	23520 b	13635 bc	0.58 d	26820 a	14490 c	0.54 ef	中抗Medium resistance
凌紫Ayamaraski	13140 k	4590 i	0.35 i	13530 h	4470 j	0.33 i	不抗Not resistance
济薯18 Jishu18	17550 g	8595 e	0.49 g	15600 g	7950 g	0.51 ef	中抗Medium resistance
济紫薯1号 Jizishu 1	15450 ij	5250 h	0.34 i	16845 f	5895 i	0.35 i	不抗Not resistance
济紫薯2号 Jizishu 2	14640 j	7470 f	0.51 f	16065 fg	8520 f	0.53 g	中抗Medium resistance
济紫薯3号 Jizishu 3	16200 hi	5985 gh	0.37 hi	16935 f	6435 h	0.38 h	不抗Not resistance

年份Year	生育期 Growth stage	叶片数 Leaf number	蔓长 Vine length	叶面积系数 Leaf area index	生物量 Biomass
年份Year	生育期 Growth stage	叶片数 Leaf number	蔓长 Vine length	叶面积系数 Leaf area index	地上部 Aboveground	地下部 Underground
2012	40 DAP	0.61^*	0.59^*	0.53^*	0.37	0.50
	60 DAP	0.62^*	0.53^*	0.49	0.42	0.48
	80 DAP	0.69^**	0.65^**	0.52^*	0.60^*	0.63^*
	100 DAP	0.73^**	0.52*	0.67^**	0.60^*	0.61^*
2013	40 DAP	0.56^*	0.61^*	0.56^*	0.46	0.42
	60 DAP	0.50	0.61^*	0.49	0.51	0.50
	80 DAP	0.59^*	0.59^*	0.53^*	0.64^*	0.65^**
	100 DAP	0.65^**	0.60^*	0.71^**	0.63^*	0.61^*

Evaluation of drought tolerance and screening for drought-tolerant indicators in sweetpotato cultivars

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