Crops ›› 2018, Vol. 34 ›› Issue (2): 171-176.doi: 10.16035/j.issn.1001-7283.2018.02.030

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Effects of Seeds Dressing Agent on Morphologyand Biochemical Characteristics of Direct-Sowing Rice Seeding

Huang Suihua,Luo Haowen,Huang Xingge,Fan Pingshan,Kong Leilei,Zhong Zhuojun,Tang Xiangru   

  1. College of Agronomy, South China Agricultural University/Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, Guangzhou 510624, Guangdong, China
  • Received:2017-10-17 Revised:2018-01-17 Online:2018-04-20 Published:2018-08-27

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Abstract:

In order to study the effects of seeds dressing agent on rice seedling quality and physiological-biochemical characteristics of rice, a pot experiment was conducted with two regular rice Basmati and Xiangyaxiangzhan, three different seeds dressing agent treatments (CK,T1 and T2), which were used Seed Dressing Agent 1 (0.6g ABT6, 40g paclobutrazol and 9.4g carbendazim) or Seed Dressing Agent 2 (0.5g ABT6, 40g paclobutrazol and 9.5g carbendazim) mixing with rice seeds before sowing. The results showed that both two seeds dressing agent-treatments could shorten plant height, increase stem diameter, root volume, root surface area, root length, activities of root, and improve dry weight per unit seeding height. Moreover, T1 and T2 could markedly increase the content of chlorophyll, net photosynthetic rate, and maximal photochemistry efficiency in rice seedling. Furthermore, the activities of Peroxidase (POD) and Catalase (CAT) in rice seedling were increased by using seeds dressing agents, and the reduction of Malonaldehyde (MDA) was found. The results also showed that both T1 and T2 seeds dressing agents could strengthen the qualities of rice seedling in direct-seeded rice.

Key words: Direct-sowing rice, Seeds dressing agent, Seeding quality, Physiological characteristics

Table 1

Effects of seed dressing agent on above ground morphological character"

处理
Treatment		 株高(cm)
Plant height		 茎基宽(mm)
Basal diameter		 叶面积(cm2)
Leaf area		 叶绿素含量(SPAD)
Chlorophyll content		 单位苗高干重(mg/cm)
Dry weight per unit seedling height
B CK 22.22±0.73a 6.27±0.15c 4.13±0.24a 19.73±0.18b 5.65±0.18b
T1 11.76±0.36b 7.58±0.52b 3.98±0.13a 25.40±0.52a 8.23±0.10a
T2 12.46±0.88b 9.29±0.29a 3.54±0.29a 24.17±0.22a 7.46±0.28a
X CK 18.82±0.69a 5.23±0.16b 2.78±0.21a 17.67±0.32c 3.28±0.05c
T1 11.26±0.88b 6.13±0.17a 2.75±0.13a 21.90±0.70a 4.45±0.17b
T2 11.13±0.48b 6.17±0.38a 2.78±0.15a 19.23±0.41b 5.48±0.20a

Table 2

Effects of seed dressing agent on root morphological character"

处理Treatment 根长Root length (mm) 表面积Superficial area (cm2) 根体积Root volume (cm3) 根尖数Tips
B CK 228.81±0.01b 16.43±0.53b 0.10±0.01b 1 006.50±57.45c
T1 247.97±0.02b 18.78±0.61b 0.12±0.01b 1 152.00±48.21b
T2 357.92±0.02a 26.39±1.68a 0.16±0.02a 1 656.00±27.14a
X CK 141.26±0.01a 9.81±0.12b 0.05±0.00c 622.50±28.00a
T1 151.98±0.00a 11.28±1.59ab 0.08±0.01b 589.83±16.91a
T2 193.92±0.02a 16.25±0.91a 0.11±0.00a 636.00±28.31a

Fig.1

Effects of seed dressing agent on root activity"

Table 3

Effects of seed dressing agent on chlorophyll content mg/g"

处理
Treatment		 叶绿素a
Chlorophyll a		 叶绿素b
Chlorophyll b		 类胡萝卜素
Carotenoid		 总叶绿素
Total chlorophyll
B CK 1.08±0.14c 0.55±0.02c 0.23±0.03c 1.76±0.15c
T1 1.63±0.11b 0.80±0.06b 0.33±0.02b 2.61±0.07b
T2 2.20±0.02a 1.22±0.03a 0.40±0.01a 3.70±0.03a
X CK 0.62±0.01b 0.27±0.00c 0.16±0.00b 0.94±0.00b
T1 0.70±0.00a 0.31±0.00a 0.17±0.00a 1.07±0.01a
T2 0.69±0.00a 0.30±0.00a 0.17±0.00a 1.04±0.01a

Table 4

Effects of seed dressing agent on photosynthetic parameters"

处理Treatment Pn [μmol/(m2·s)] Gs [μmol/(m2·s)] Ci (μmol/mol) Tr [mmol/(m2·s)]
B CK 9.470±0.19b 0.010±0.00b 355.960±18.70a 0.488±0.08b
T1 14.096±1.76a 0.020±0.00a 417.450±19.31a 0.998±0.08a
T2 11.227±0.02ab 0.022±0.00a 407.970±6.73a 1.118±0.08a
X CK 14.283±0.08c 0.005±0.00c 312.990±2.41b 0.251±0.04c
T1 14.954±0.09b 0.022±0.00a 382.390±10.77a 1.091±0.02a
T2 15.415±0.10a 0.011±0.00b 380.920±23.50a 0.548±0.01b

Fig.2

Effects of seed dressing agent on soluble sugar content and soluble protein content"

Table 5

Effects of seed dressing agent on chlorophyll fluorescence characteristics"

处理Treatment Fv/Fm Fm F0 NPQ qP ETR
B CK 0.74±0.00b 0.33±0.00c 0.15±0.00b 0.77±0.00a 0.17±0.00c 23.00±0.58c
T1 0.77±0.01a 0.41±0.01b 0.20±0.01ab 0.74±0.01a 0.26±0.00a 35.33±0.67a
T2 0.76±0.01a 0.44±0.01a 0.31±0.06a 0.78±0.01a 0.21±0.00b 26.50±0.29b
X CK 0.70±0.01c 0.16±0.01c 0.08±0.00c 0.73±0.00c 0.21±0.01b 25.00±0.58c
T1 0.75±0.00b 0.28±0.00b 0.14±0.00b 0.76±0.00b 0.21±0.01b 28.00±0.58b
T2 0.78±0.00a 0.35±0.00a 0.17±0.00a 0.77±0.00a 0.24±0.01a 31.00±0.58a

Table 6

Effects of seed dressing agent on anti-oxidant system of leaves"

处理
Treatment		 POD活性[U/(g·min)]
POD activity		 SOD活性[U/(g·min)]
SOD activity		 CAT活性[U/(g·min)]
CAT activity		 MDA含量(umol/g)
MDA content
B CK 117.53±5.09b 217.41±0.95a 97.95±8.59c 2.15±0.07a
T1 126.00±4.37ab 210.44±6.97a 140.31±5.79b 1.83±0.04b
T2 136.47±5.17a 214.50±4.24a 182.96±9.73a 2.01±0.03ab
X CK 129.38±3.25b 222.62±7.29a 152.00±8.00b 3.24±0.04a
T1 141.86±1.10a 242.10±5.31a 218.81±6.49a 2.84±0.11b
T2 132.79±4.24ab 214.40±5.33a 172.02±4.89ab 2.71±0.02b
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