Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (4): 848-856.doi: 10.3864/j.issn.0578-1752.2020.04.016

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles    

Effects of Light Intensity on c-fos, Biological Clock Gene Expression and Melatonin in Cherry Valley Meat Ducks

JiaJie CUI,Qiang XIE,ShuangShuang ZHAI,Tao GONG,YongWen ZHU,Lin YANG(),WenCe WANG()   

  1. College of Animal Science, South China Agricultural University/Guangdong Provincial Key Laboratory of Animal Nutrition and Regulation, Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642
  • Received:2019-01-24 Accepted:2019-04-17 Online:2020-02-16 Published:2020-03-09
  • Contact: Lin YANG,WenCe WANG E-mail:ylin@scau.edu.cn;wangwence@scau.edu.cn

Abstract:

【Objective】 The objective of this study was to investigate the effects of different intensities of light stimulation on c-fos and related clock genes in hypothalamus, diencephalon, pituitary and mesencephalon, as well as melatonin levels in plasma and liver of cherry valley meat duck under continuous darkness. 【Method】 A total of one hundred and forty four 1-day-old cherry valley meat ducks were raised to the age of 21 days. 22-day-old cherry valley meat ducks were randomly divided into 2 groups. Each group had 6 replicates, with 12 ducks per replicate, and kept dark for 7 days, the ducks were given ad libitum access to water and feed. After 7 days lasting darkness, 28-day-old ducks received a LED white light stimulation of different intensities for 1.5 h and then a dark adaptation for 1.5 h. One duck from each replicate was slaughted for sample collection, the expression levels of c-fos and circadian clock genes in the hypothalamus, diencephalon, pituitary and mesencephalon were measured, and plasma and liver melatonin levels were measured. 【Result】 The expression level of c-fos in hypothalamus and mesencephalon of the 10 Lx group was significantly higher than that in the 80 Lx group (P<0.05). The level of c-fos in the diencephalon was significantly lower than that in the 80 Lx group (P<0.05), and there was no significant difference of c-fos expression in pituitary in the two groups(P>0.05). Compared with the 80 Lx group, the expression of clock gene clock, Bmal1, Bmal2 and Per2 in the 10 Lx group in the hypothalamus was significantly increased (P<0.05), and the expression of Cry1 was little increased in the 10 Lx group (P=0.06) .The expression level of Bmal1 in the diencephalon was significantly higher in the 10 Lx group (P<0.05), while Bmal2, Clock, Per2 and Cry1 showed no significant difference (P>0.05) in two groups. The expression of Clock and Per2 in the mesencephalon was significantly higher in the 10 Lx group than that in the 80 Lx group (P<0.05). The expression of Bmal1, Bmal2 and Cry1 in the two groups had no significant difference (P>0.05). The expression of clock genes in pituitary was not significant affect by light intensity (P>0.05). Compared with the 80 Lx, the plasma level of melatonin in 10 Lx group was significantly lower (P<0.05), while the melatonin levels in the liver were significantly higher. 【Conclusion】 In the continuous darkness, transient high intensity light stimulation could inhibit the expression of c-fos in the hypothalamus and mesencephalon, and increase the expression of c-fos in the diencephalon, while the stimulation could attenuate the amplitude of gene expression in the hypothalamus and diencephalon of the meat duck.

Key words: cherry valley meat duck, continuous darkness, light intensity, c-fos, biological clock

Table 1

Primer information"

基因 Gene 序列号 Accession No. 引物序列(5'-3') Primer sequence (5′-3′) 大小 Product (bp)
c-fos NM_205508.1 F: CAGCCCACCCTCATCTCCTC 144
R: CCTTCGTCCGATGCTCTGC
Clock XM_005012718.3 F: GCACTCCTCCAAGGCAAAG 169
R: AACACTGGCTGGGACACG
Cry1 XM_005011518.2 F: GGCTGTTTGTCTTGTCGT 145
R: ACCGTGGATTGTTAGTCG
Bmal1 XM_013106919.2 F: TGTTTCCACCAGCGTTCT 133
R: AATGCCAGGGACAGTAGG
Bmal2 NM-204133.1 F: CGGCGTTCCTTCTTCTGTC 165
R: TTCCTCTTCCACTCCCACC
Per2 XM_005028592.3 F: AAGCGTTGTATCACTCAC 106
R: ACTCGGACCATCTTCTAT
β-actin NM_001310421.1 F: TACGCCAACACGGTGCTG 215
R: GATTCATCATACTCCTGCTTG

Fig. 1

Effects of different light intensity treatments on the relative expression of c-fos mRNA in meat ducks Columns with ** mean extremely significant difference(P<0.01), Columns with * mean significant difference(P<0.05). The same as below"

Table 2

Effects of different light intensity treatments on the relative expression of Bmal1 mRNA in meat ducks"

10 Lx 80 Lx 标准误 Sem PP value
下丘脑Hypothalamus 1.15A 0.87B 0.05 <0.01
间脑Diencephalon 1.43A 0.76B 0.08 <0.01
垂体Pituitary 1.20 1.04 0.19 0.60
中脑Mesencephalon 1.26 1.20 0.20 0.87

Table 3

Effects of different light intensity treatments on the relative expression of Bmal2 mRNA in meat ducks"

10 Lx 80 Lx 标准误 Sem PP value
下丘脑Hypothalamus 1.03A 0.51B 0.09 <0.01
间脑Diencephalon 1.03 0.72 0.12 0.08
垂体Pituitary 1.05 0.98 0.12 0.74
中脑Mesencephalon 0.89 0.76 0.12 0.45

Table 4

Effects of different light intensity treatments on the relative expression of Clock mRNA in meat ducks"

10 Lx 80 Lx 标准误 Sem PP value
下丘脑Hypothalamus 0.96a 0.44b 0.13 0.02
间脑Diencephalon 1.09 0.65 0.35 0.19
垂体Pituitary 0.78 0.54 0.10 0.14
中脑Mesencephalon 0.81a 0.50b 0.07 0.02

Table 5

Effects of different light intensity treatments on the relative expression of Cry1 mRNA in meat ducks"

10 Lx 80 Lx 标准误 Sem PP value
下丘脑Hypothalamus 0.93 0.48 0.14 0.06
间脑Diencephalon 0.90 0.62 0.10 0.09
垂体Pituitary 1.00 0.76 0.12 0.23
中脑Mesencephalon 1.01 0.86 0.08 0.18

Table 6

Effects of different light intensity treatments on the relative expression of Per2 mRNA in meat ducks"

10 Lx 80 Lx 标准误 Sem PP Value
下丘脑Hypothalamus 0.84A 0.41B 0.05 <0.01
间脑Diencephalon 0.93 0.78 0.36 0.11
垂体Pituitary 1.08 0.97 0.09 0.43
中脑Mesencephalon 0.82a 0.59b 0.06 0.04

Fig. 2

Effects of different light intensity treatments on plasma and liver melatonin content in meat ducks"

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