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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (3): 462-471.doi: 10.3724/SP.J.1006.2020.94038

• RESEARCH NOTES • Previous Articles    

Reason exploration for soil aeration promoting photosynthate transportation between sink and source in sweet potato

Yong-Chen LIU1,Cheng-Cheng SI2,Hong-Juan LIU1,*(),Bin-Bin ZHANG1,Chun-Yu SHI1,*()   

  1. 1. College of Agronomy, Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai’an 271018, Shandong, China;
    2. College of Horticulture and Landscape Architecture, Hainan University, Haikou 570228, Hainan, China
  • Received:2019-03-08 Accepted:2019-09-26 Online:2020-03-12 Published:2019-10-12
  • Contact: Hong-Juan LIU,Chun-Yu SHI E-mail:liumei0535@126.com;scyu@sdau.edu.cn
  • Supported by:
    This study was supported by the National Natural Science Foundation of China(31371577);This study was supported by the National Natural Science Foundation of China(31701357);the Potato Innovation Program for Chief Expert of Shandong Province(SDAIT-16-01)

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Abstract:

Field experiments were performed using the varieties of starchy sweet potato Shangshu 19 and Jixu 23 with three treatments including loose soil, control soil and compact soil, to clarify the regulatory mechanism of soil compaction on transportation of photosynthates between sink and source of sweet potato. Compared with control treatment, storage root yield and economic coefficient of loose soil treatment were significantly increased by 27.03%-38.74% and 6.30%-13.05% in two years, respectively, while those of compact soil treatment significantly decreased by 17.87%-15.92% and 10.83%-15.63%, respectively. The 13C labeling results of functional leaves showed that loose treatment significantly improved the import efficiency of photosynthate in storage roots. Loose soil treatment significantly increased sucrose and starch contents in storage roots, but significantly reduced starch content in aboveground organs, especially in lower-middle position of stem. Compact soil treatment significantly decreased sucrose and starch contents in storage roots, but significantly increased starch and sucrose contents in aboveground organs especially in lower-middle position of stem. Both difference of sucrose content between stem base and stem top and between stem base and storage root at 50-150 days after planting in loose treatment were significantly decreased. While, significantly increased in compact treatment. The variation range of sucrose content difference between stem base and storage root was larger than between stem base and stem top. There was a very significantly negative correlation between the sucrose content difference of stem base and storage root, and the sucrose and starch content in storage root. Improvement of soil aeration, can promote the transportation of photosynthates from stem base to storage root, increase carbohydrate content in storage root and enhance storage root yield.

Key words: sweet potato, soil aeration, storage root yield, photosynthate, transportation

Fig. 1

Patterns of main stem partition"

Table 1

Physical characteristics of the soil in planting"

年份Year 处理Treatment 土层深度
Soil layer
(cm)		 土壤紧实度
Soil volume weight (kPa)		 土壤容重
Soil
compactness
(g cm-3)		 土壤比重
Soil specific gravity
(g cm-3)		 总孔隙度
Total
porosity
(%)		 毛管孔隙度
Capillary porosity (%)		 非毛管孔隙度
Non-capillary porosity
(%)
2017 SS 5-10 126.49 1.26 2.58 51.35 24.86 26.49
15-20 224.23 1.30 2.57 49.35 25.50 23.85
CK 5-10 301.16 1.33 2.64 49.81 24.15 25.66
15-20 464.12 1.39 2.73 49.19 31.68 17.51
JS 5-10 541.63 1.46 2.73 46.38 31.78 14.60
15-20 927.74 1.49 2.75 45.71 38.30 7.41
2018 SS 5-10 143.17 1.25 2.57 50.69 24.62 26.07
15-20 174.17 1.29 2.58 49.62 25.46 24.16
CK 5-10 267.91 1.33 2.65 48.92 25.30 23.62
15-20 508.06 1.38 2.73 48.65 30.14 18.51
JS 5-10 826.07 1.47 2.74 46.66 31.21 15.45
15-20 1230.60 1.49 2.75 45.83 36.91 8.92

Table 2

Yield of storage root and its economic coefficient"

年份Year 品种
Variety		 处理Treatment 单株结薯数
Number of storage root (lump plant-1)		 单薯重
Fresh weight
(g lump-1)		 块根产量
Storage root yield (kg hm-2)		 经济系数
Economic coefficient
(%)
2017 商薯19
Shangshu 19		 SS 4.56 b 244.31 a 55660.87 a 70.47 a
CK 4.42 b 214.53 b 47280.21 b 65.90 b
JS 5.72 a 141.49 c 40206.75 c 61.79 c
济徐23
Jixu 23		 SS 3.58 b 315.09 a 55913.79 a 79.61 a
CK 3.47 b 274.83 b 46897.60 b 75.34 b
JS 4.39 a 188.87 c 41110.64 c 63.72 c
2018 商薯19
Shangshu 19		 SS 3.99 b 296.34 a 59113.79 a 80.13 a
CK 3.88 b 223.33 b 43361.92 b 67.57 b
JS 4.62 a 148.89 c 34353.97 c 56.35 c
济徐23
Jixu 23		 SS 2.99 b 363.18 a 54170.01 a 89.68 a
CK 2.91 b 243.25 b 34227.44 b 83.42 b
JS 3.56 a 154.82 c 27550.52 c 71.19 c

Fig. 2

Abundance changes of 13C in leaves, main stems and storage root (2017) Abbreviations are the same as those given in Table 1."

Table 3

Distribution rate of 13C assimilate in different organs during storage root expanding period (%, 2017, Variety: Shangshu 19)"

处理
Treatment		 块根
Storage root		 侧茎
Side stem		 侧叶和生长点
Side leaf and growing point		 主茎
Main stem		 标叶
Labeled leaf		 标茎
Labeled stem		 标柄
Labeled petiole
SS 53.62 15.57 27.18 2.91 0.39 0.19 0.15
CK 49.69 17.24 27.63 4.07 0.82 0.28 0.26
JS 44.75 17.47 31.12 5.17 0.85 0.27 0.38

Table 4

Sucrose content in different organs (%)"

年份
Year		 器官
Organ		 品种
Variety		 处理
Treatment		 栽后天数 Days after planting (d)
50 70 90 110 130 150
2017 叶片 商薯19 SS 3.22 a 4.27 a 4.39 a 5.86 a 6.74 a 5.11 a
Leaf Shangshu 19 CK 1.87 b 2.96 b 3.37 b 5.22 b 5.58 b 4.76 b
JS 1.53 c 2.74 b 3.01 c 4.70 c 4.81 c 4.41 c
济徐23 SS 3.75 a 4.18 a 4.25 a 5.61 a 6.94 a 4.60 a
Jixu 23 CK 2.91 b 3.33 b 3.51 b 4.59 b 5.70 b 4.19 b
JS 2.04 c 2.85 c 3.36 c 4.31 c 4.95 c 4.02 b
叶柄 商薯19 SS 10.31 a 10.89 a 12.50 a 13.04 a 13.23 a 10.76 a
Petiole Shangshu 19 CK 6.80 b 7.94 b 7.97 b 8.57 b 8.69 b 6.53 b
JS 5.88 c 6.93 c 7.50 c 7.85 c 7.91 b 5.78 c
济徐23 SS 10.24 a 10.61 a 10.35 a 11.56 a 12.55 a 10.30 a
Jixu 23 CK 7.48 b 7.64 b 7.93 b 8.33 b 8.55 b 6.83 b
JS 5.45 c 6.01 c 7.06 c 8.01 b 8.34 b 6.04 c
茎蔓 商薯19 SS 3.82 c 5.37 c 7.01 c 7.31 c 7.82 c 5.77 c
Stem Shangshu 19 CK 6.48 b 7.14 b 8.26 b 8.75 b 9.47 b 8.07 b
JS 7.84 a 8.48 a 9.46 a 9.67 a 9.73 a 9.16 a
济徐23 SS 4.62 c 5.52 c 5.88 c 6.62 c 8.00 c 6.65 c
Jixu 23 CK 6.11 b 6.57 b 7.82 b 8.91 b 9.48 b 9.21 b
JS 7.32 a 8.01 a 9.21 a 9.89 a 10.20 a 9.98 a
块根 商薯19 SS 7.40 a 7.74 a 8.31 a 9.10 a 11.26 a 8.92 a
Storage root Shangshu 19 CK 6.04 b 6.19 b 6.49 b 6.70 b 9.30 b 6.95 b
JS 5.50 c 6.01 c 5.81 c 6.33 c 8.96 c 6.42 c
济徐23 SS 7.35 a 8.62 a 9.31 a 9.26 a 10.82 a 9.20 a
Jixu 23 CK 5.70 b 6.48 b 7.41 b 7.44 b 9.08 b 6.82 b
JS 5.13 c 5.76 c 6.73 c 6.98 c 9.59 c 5.81 c
2018 叶片 商薯19 SS 2.97 a 3.74 a 4.57 a 4.68 a 3.59 a 4.82 a
Leaf Shangshu 19 CK 1.85 b 2.88 b 3.64 b 3.96 b 4.74 b 4.43 b
JS 1.45 c 2.29 c 3.03 c 3.46 c 3.81 c 3.39 c
济徐23 SS 2.32 a 3.48 a 4.05 a 4.35 a 4.88 a 4.62 a
Jixu 23 CK 1.88 b 2.80 b 3.53 b 3.69 b 4.03 b 3.54 b
JS 1.08 c 2.43 c 2.87 c 3.17 c 3.57 c 3.54 b
叶柄 商薯19 SS 8.26 a 9.58 a 13.00 a 14.54 a 14.93 a 13.55 a
Petiole Shangshu 19 CK 6.80 b 7.40 b 9.03 b 10.58 b 11.89 b 10.62 b
JS 5.97 c 6.42 c 8.23 c 8.62 c 8.87 c 10.45 b
济徐23 SS 9.10 a 9.94 a 14.07 a 14.25 a 15.25 a 12.44 a
Jixu 23 CK 7.29 b 7.96 b 9.83 b 11.20 b 10.89 b 10.10 b
JS 5.88 c 7.33 c 8.34 c 8.60 c 8.38 c 9.99 b
茎蔓 商薯19 SS 4.65 c 5.71 c 7.07 c 7.49 c 8.33 c 7.25 c
Stem Shangshu 19 CK 6.02 b 7.75 b 9.17 b 9.27 b 10.35 b 9.10 b
JS 7.11 a 9.17 a 10.42 a 10.74 a 11.22 a 10.52 a
济徐23 SS 4.98 c 6.00 c 6.76 c 7.18 c 8.34 c 7.06 c
Jixu 23 CK 6.61 b 6.97 b 8.84 b 9.19 b 10.29 b 8.50 b
JS 7.58 a 9.69 a 10.58 a 11.16 a 11.65 a 9.83 a
块根 商薯19 SS 5.60 a 7.29 a 9.85 a 11.02 a 12.72 a 11.49 a
Storage root Shangshu 19 CK 4.28 b 5.14 b 6.03 b 7.68 b 8.36 b 7.25 b
JS 3.57 c 4.15 c 4.66 c 6.04 c 6.24 c 5.96 c
济徐23 SS 5.19 a 7.29 a 10.24 a 11.78 a 12.93 a 11.99 a
Jixu 23 CK 3.68 b 4.99 b 6.16 b 7.05 b 7.75 b 7.00 b
JS 3.20 c 4.13 c 5.14 c 5.85 c 6.49 c 5.42 c

Table 5

Starch content in different organs (%)"

年份
Year		 器官
Organ		 品种
Variety		 处理
Treatment		 栽后天数 Days after planting (d)
50 70 90 110 130 150
2017 叶片 商薯19 SS 4.29 a 5.27 a 7.11 c 9.05 c 9.96 c 9.52 c
Leaf Shangshu 19 CK 3.64 b 4.64 b 8.96 b 11.38 b 11.60 b 10.84 b
JS 3.44 c 4.59 b 9.59 a 12.87 a 14.28 a 12.07 a
济徐23 SS 5.48 a 6.32 a 7.37 b 8.89 b 10.16 c 8.87 c
Jixu 23 CK 4.63 b 5.53 b 9.94 a 11.99 a 12.21 b 11.81 b
JS 4.32 c 5.19 c 10.39 a 12.15 a 13.71 a 12.24 a
叶柄 商薯19 SS 6.16 a 7.21 c 9.33 c 10.69 b 10.86 c 8.17 c
Petiole Shangshu 19 CK 5.09 b 7.94 b 10.95 b 12.14 a 12.50 b 9.88 b
JS 4.40 c 9.27 a 12.33 a 12.43 a 13.90 a 11.51 a
济徐23 SS 7.64 a 7.82 c 9.11 c 9.70 c 10.14 c 7.45 c
Jixu 23 CK 6.11 b 8.45 b 10.56 b 11.09 b 11.73 b 9.36 b
JS 5.58 c 9.69 a 12.15 a 12.38 a 13.81 a 11.13 a
茎蔓 商薯19 SS 16.01 c 16.85 c 19.44 c 15.54 c 17.06 c 12.86 b
Stem Shangshu 19 CK 18.37 b 19.05 b 21.61 b 19.02 b 19.75 b 13.34 a
JS 19.81 a 20.71 a 22.68 a 20.20 a 21.80 a 13.39 a
济徐23 SS 15.45 c 16.32 c 19.08 c 16.32 c 17.15 c 13.81 c
Jixu 23 CK 18.81 b 19.17 b 21.62 b 18.33 b 18.79 b 14.33 b
JS 20.69 a 21.52 a 23.85 a 19.52 a 20.61 a 15.68 a
块根 商薯19 SS 38.74 a 40.78 a 61.29 a 67.69 a 79.46 a 88.66 a
Storage root Shangshu 19 CK 24.75 b 29.61 b 44.92 b 58.35 b 66.81 b 71.28 b
JS 22.24 c 25.92 c 38.34 c 51.25 c 61.07 c 64.95 c
济徐23 SS 35.49 a 38.6 a 58.22 a 68.65 a 81.63 a 87.81 a
Jixu 23 CK 26.98 b 30.86 b 45.86 b 59.61 b 65.61 b 69.75 b
JS 24.31 c 27.9 c 38.79 c 51.04 c 58.05 c 60.52 c
2018 叶片 商薯19 SS 2.21 a 3.83 a 5.61 a 6.39 c 8.05 c 8.25 c
Leaf Shangshu 19 CK 1.72 b 3.04 b 5.62 a 7.25 b 10.16 b 9.88 b
JS 1.52 c 2.69 c 5.63 a 8.33 a 11.71 a 10.47 a
济徐23 SS 2.02 a 4.06 a 5.11 a 5.92 c 8.11 c 7.82 c
Jixu 23 CK 1.72 b 3.31 b 5.27 a 7.45 b 9.60 b 8.28 b
JS 1.44 c 2.32 c 5.38 a 8.30 a 11.17 c 10.19 a
叶柄 商薯19 SS 5.06 a 6.70 a 7.70 c 10.97 c 11.56 c 10.22 c
Petiole Shangshu 19 CK 4.33 b 6.52 ab 8.70 b 13.42 b 14.64 b 12.78 b
JS 3.74 c 6.20 b 10.07 a 15.33 a 16.02 a 14.43 a
济徐23 SS 5.79 a 6.57 a 8.26 c 11.46 c 11.23 c 10.25 c
Jixu 23 CK 3.96 b 6.47 a 10.21 b 14.00 b 15.29 b 12.41 b
JS 3.40 c 6.43 a 11.32 c 15.19 a 16.91 a 14.59 a
茎蔓 商薯19 SS 12.85 c 13.90 c 14.98 c 15.66 c 16.36 c 15.13 c
Stem Shangshu 19 CK 14.13 b 15.34 b 17.60 b 18.34 b 19.42 b 16.90 b
JS 15.23 a 17.22 a 19.09 a 20.34 a 22.25 a 18.44 a
济徐23 SS 11.74 c 12.41 c 13.87 c 14.86 c 15.46 c 12.48 c
Jixu 23 CK 13.23 b 14.74 b 15.30 b 16.98 b 17.45 b 13.92 b
JS 14.92 a 16.70 a 18.78 a 21.23 a 22.68 a 17.69 a
块根 商薯19 SS 34.04 a 41.80 a 60.46 a 66.33 a 76.01 a 83.07 a
Storage root Shangshu 19 CK 23.52 b 32.00 b 45.61 b 47.44 b 58.76 b 70.06 b
JS 20.72 c 27.10 c 40.10 c 41.89 c 50.12 c 60.51 c
济徐23 SS 37.92 a 44.20 a 62.13 a 65.75 a 75.70 a 86.02 a
Jixu 23 CK 22.92 b 28.36 b 42.12 b 47.90 b 58.03 b 65.40 b
JS 19.68 c 25.07 c 34.60 c 41.35 c 50.74 c 56.93 c

Table 6

Contents of sucrose and starch in different positions of stem (%, 2018)"

项目 Item 部位
Position		 品种
Variety		 处理
Treatment		 栽后天数 Days after planting (d)
50 70 90 110 130 150
蔗糖Sucrose 茎顶部
Stem top		 商薯19 SS 3.07 a 4.45 a 5.03 a 5.36 a 5.87 a 5.40 a
Shangshu 19 CK 1.64 b 3.25 b 4.33 b 4.74 b 5.37 b 4.88 b
JS 1.19 c 2.46 c 3.85 c 4.25 c 4.71 c 4.48 c
济徐23 SS 2.50 a 4.61 a 5.13 a 5.72 a 6.25 a 5.26 a
Jixu 23 CK 2.07 b 3.18 b 4.47 b 5.10 b 5.43 b 4.36 b
JS 1.70 c 2.49 c 3.91 c 4.73 c 4.74 c 4.00 c
茎中部
Stem middle		 商薯19 SS 2.60 c 2.87 c 3.35 c 4.07 c 5.58 c 4.44 c
Shangshu 19 CK 3.76 b 3.24 b 4.12 b 5.30 b 6.60 b 5.82 b
JS 5.13 a 4.37 a 5.69 a 6.71 a 8.24 a 6.75 a
济徐23 SS 1.69 c 2.48 c 3.33 c 4.12 c 5.45 c 3.93 c
Jixu 23 CK 2.08 b 3.14 b 4.01 b 5.32 b 6.26 b 4.97 b
JS 4.71 a 4.54 a 5.33 a 7.01 a 7.96 a 6.25 a
茎基部
Stem base		 商薯19 SS 8.75 c 9.58 c 10.10 c 10.41 c 11.34 c 10.27 c
Shangshu 19 CK 9.87 b 11.50 b 12.84 b 11.69 b 12.51 b 11.51 b
JS 10.91 a 13.32 a 14.88 a 14.47 a 15.47 a 13.79 a
济徐23 SS 8.30 c 9.53 c 9.93 c 9.94 c 10.89 c 9.52 c
Jixu 23 CK 9.93 b 11.20 b 12.10 b 11.33 b 12.36 b 11.12 b
JS 11.40 a 13.41 a 14.49 a 14.27 a 14.86 a 13.35 a
淀粉Starch 茎顶部
Stem top		 商薯19 SS 11.93 c 13.12 c 14.53 c 15.40 c 16.17 c 14.46 c
Shangshu 19 CK 13.17 b 14.49 b 16.82 b 17.79 b 18.17 b 16.50 b
JS 14.53 a 16.36 a 18.79 a 20.09 a 21.11 a 18.12 a
济徐23 SS 11.99 c 12.26 c 13.24 c 15.02 c 15.58 c 11.86 c
Jixu 23 CK 13.07 b 14.66 b 15.30 b 16.30 b 17.41 b 13.19 b
JS 14.39 a 16.54 a 18.36 a 19.53 a 20.47 a 16.65 a
茎中部
Stem middle		 商薯19 SS 14.11 c 14.89 c 15.72 c 17.17 c 18.19 c 17.09 c
Shangshu 19 CK 15.37 b 17.59 b 17.89 b 19.56 b 20.47 b 19.96 b
JS 17.62 a 19.00 a 21.05 a 21.96 a 22.71 a 21.56 a
济徐23 SS 13.88 c 14.56 c 15.29 c 16.38 c 17.31 c 15.35 c
Jixu 23 CK 16.21 b 18.18 b 19.01 b 19.62 b 20.54 b 17.76 b
JS 18.28 a 20.07 a 20.85 a 22.27 a 22.52 a 20.05 a
茎基部
Stem base		 商薯19 SS 18.73 c 19.73 c 21.16 c 21.69 c 22.23 c 21.17 c
Shangshu 19 CK 22.32 23.34 c 24.36 c 24.29 c 25.49 c 24.62 b
JS 24.69 a 25.57 a 26.47 a 27.40 a 28.84 a 27.85 a
济徐23 SS 17.56 c 19.59 c 50.80 c 21.22 c 21.92 c 20.17 c
Jixu 23 CK 21.34 b 23.16 b 23.88 b 23.80 b 25.11 b 23.26 b
JS 23.47 a 25.11 a 26.83 a 27.75 a 29.47 a 28.09 a

Table 7

Difference of sucrose contents between adjacent organs (%)"

年份Year 栽后天数Days after planting (d) 品种
Variety		 处理Treatment 柄-叶
Petiole-
Leaf		 柄-茎顶部Petiole-
Stem top		 茎基部-茎顶部
Stem base-
Stem top		 茎基部-块根Stem top-
Storage root
2017 90 商薯19 SS 96.03 a 55.62 a 10.34 c -5.95 c
Shangshu 19 CK 81.13 b 15.55 c 31.08 b 35.90 b
JS 85.44 b 25.39 b 60.84 a 60.84 a
济徐23 SS 83.56 a 35.90 a -2.53 c -28.05 c
Jixu 23 CK 77.27 b 22.44 b 44.57 b 29.36 b
JS 71.02 c 26.28 b 63.22 a 43.12 a
110 商薯19 SS 75.98 a 54.81 a -1.36 c -21.55 c
Shangshu 19 CK 48.59 b 28.38 b 30.64 b 26.76 b
JS 50.20 b 32.25 b 54.62 a 44.28 a
济徐23 SS 69.31 a 34.60 a -22.53 c -35.03 c
Jixu 23 CK 57.89 b 10.35 c 15.48 b 16.41 b
JS 60.06 b 17.07 b 45.18 a 41.99 a
130 商薯19 SS 65.00 a 41.98 a -36.07 c -60.95 c
Shangshu 19 CK 43.59 c 22.68 c 25.80 b -3.61 b
JS 48.74 b 27.46 b 44.76 a 5.43 a
济徐23 SS 57.57 a 33.05 a -49.03 c -66.01 c
Jixu 23 CK 40.00 c 19.94 c 18.65 b -7.31 b
JS 51.02 b 29.75 b 38.01 a -5.46 a
2018 90 商薯19 SS 95.99 a 88.36 a 67.04 c 2.56 c
Shangshu 19 CK 84.95 a 70.22 b 99.07 b 72.14 b
JS 92.21 b 72.52 b 117.78 a 104.62 a
济徐23 SS 110.58 a 93.16 a 63.79 c -3.02 c
Jixu 23 CK 94.39 c 75.00 b 92.15 b 65.08 b
JS 97.68 b 72.29 b 114.98 a 95.33 a
110 商薯19 SS 102.48 a 92.27 a 64.18 c -5.68 c
Shangshu 19 CK 91.05 b 76.23 b 84.58 b 41.45 b
JS 85.38 b 68.04 c 109.26 a 82.20 a
济徐23 SS 106.44 a 85.44 a 53.97 c -16.85 c
Jixu 23 CK 100.85 b 74.91 b 75.91 b 46.60 b
JS 92.25 c 58.05 c 100.38 a 83.64 a
130 商薯19 SS 91.07 a 87.05 a 63.50 c -11.47 c
Shangshu 19 CK 85.95 b 75.53 b 79.91 b 39.79 b
JS 79.78 c 61.30 c 106.66 a 84.97 a
济徐23 SS 103.02 a 83.76 a 54.22 c -17.08 c
Jixu 23 CK 92.04 b 67.01 b 77.99 b 45.90 b
JS 80.44 c 55.32 c 103.25 a 78.36 a

Table 8

Analysis of correlation coefficient between differences in sucrose content in sweet potato organs and sucrose and starch contents in tuber root"

品种Variety 相邻器官间蔗糖含量差
Sucrose content differences between adjacent organ		 与块根蔗糖含量的相关系数Correlation coefficient of sucrose
content between adjacent organs with sucrose content in storage root		 与块根淀粉含量的相关系数
Correlation coefficient of sucrose content between adjacent organs with starch content
in storage root
商薯19
Shangshu 19		 柄-叶 Petiole-Leaf -0.274 -0.679**
柄-茎顶部 Petiole-Stem top -0.308 -0.732**
茎基部-茎顶部 Stem base-Stem top -0.758** -0.934**
茎基部-块根 Stem top-Storage roots -0.924** -0.882**
济徐23
Jixu 23		 柄-叶 Petiole-Leaf -0.210 -0.582*
柄-茎顶部 Petiole-Stem top -0.243 -0.651**
茎基部-茎顶部 Stem base-Stem top -0.839** -0.933**
茎基部-块根 Stem top-Storage roots -0.913** -0.856**
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