Crops ›› 2018, Vol. 34 ›› Issue (1): 107-112.doi: 10.16035/j.issn.1001-7283.2018.01.017

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Varietal Difference in Yield and Cd Accumulation and Distribution in Panicle of Rice Affected by Soil Cd Content

Yuan Zhengui,Chen Pingping,Guo Lili,Tu Naimei,Yi Zhenxie   

  1. College of Agronomy, Hunan Agricultural University/South Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410128, Hunan, China
  • Received:2017-08-25 Revised:2017-10-13 Online:2018-02-20 Published:2018-08-24

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Abstract:

Three late rice varieties with different grain Cd accumulation ability, Tianyouhuazhan, Xing No.2 and Xiangwanxian No.13, were used as materials to study the effect of increasing soil Cd content on rice yield and Cd accumulation and distribution in rice panicle and its varietal difference under different soil Cd content conditions. The results showed that: (1) Increasing soil Cd induced yield decrease, and yield of all varieties decreased significantly by adding 1.0mg/kg Cd, and the decreasing extent of Tianyouhuazhan was the biggest. Effects of increasing soil Cd on rice yield components had varietal difference, while the main reasons for yield decreasing was almost the same, that was mainly by decreasing effective kernels, seed setting rate and harvest index. (2) Cd content in rice panicle and grain was significantly increased with the increment of soil Cd content, while it existed no linear correlation, and the increasing extent showed the trend of Tianyouhuazhan>Xing No.2>Xiangwanxian No.13. (3) Cd accumulation in rice panicle was significantly increased with the increment of soil Cd content, showing the trend of Tianyouhuazhan>Xing No.2>Xiangwanxian No.13. (4) Cd in rice panicle was mainly accumulated in filled grains, while the proportion of Cd in filled grains to Cd in whole panicle was decreased with the increment of soil Cd content, and the proportion of Cd in filled grains to Cd in whole panicle showed the trend of Xing No.2>Tianyouhuazhan>Xiangwanxian No.13. The results showed that the effects of increasing soil Cd content on yield and accumulation and distribution of Cd in rice panicle existed clear varietal difference, and the different rice variety should be selected in paddy filed with difference Cd content.

Key words: Rice, Soil Cd content, Yield, Cd accumulation and distribution, Varietal difference

Table 1

Effects of soil Cd content on yield and yield components of rice"

品种
Variety		 Cd浓度
Cd concentration		 单穴有效穗数
Effective panicles
per hill		 每穗实粒数
Filled grains
per panicle		 结实率
Seed setting rate		 千粒重(g)
1000-grain weight		 单穴产量
Yield per hill		 收获指数
Harvest index
天优华占 Cd1 11.25ab 78.64a 0.68a 22.95b 20.31a 0.53a
Tianyouhuazhan Cd2 11.75a 73.83b 0.59b 23.16a 20.09a 0.50b
Cd3 10.58b 68.21c 0.60b 23.30a 16.82b 0.50b
星2号Xing No.2 Cd1 11.25a 69.73b 0.76a 25.71a 20.17a 0.48a
Cd2 9.50b 79.22a 0.73ab 25.90a 19.50a 0.45a
Cd3 9.00b 78.03a 0.69b 25.98a 18.25b 0.46a
湘晚籼13号 Cd1 10.00a 69.34a 0.59a 25.11b 17.41a 0.41a
Xiangwanxian No.13 Cd2 9.50b 69.28a 0.59a 25.87a 17.03a 0.39b
Cd3 9.90a 65.42b 0.59a 24.76b 16.04b 0.40ab

Table 2

Effects of soil Cd content on Cd content in different parts of panicle and grain of rice mg/kg"

品种
Variety		 Cd浓度
Cd concentration		 穗各部分Cd含量
Cd content in parts of panicle		 谷粒各部分Cd含量
Cd content in parts of grain
实粒
Filled grain		 空粒
Empty grain		 枝梗
Branch		 谷壳
Hull		 糙米
Brown rice		 精米
Milled rice
天优华占Tianyouhuazhan Cd1 0.3311c 0.4254c 0.4660c 0.1687c 0.3342c 0.3240c
Cd2 1.8104b 2.5177b 3.1910b 0.9226b 1.8274b 1.7717b
Cd3 2.5754a 4.9516a 6.6490a 1.3124a 2.5995a 2.5203a
星2号Xing No.2 Cd1 0.2075c 0.3346c 0.3081c 0.1112c 0.2162c 0.1952c
Cd2 1.5778b 2.0053b 2.2895b 0.8451b 1.6433b 1.4839b
Cd3 2.2946a 4.2543a 5.1146a 1.2290a 2.3898a 2.1581a
湘晚籼13号Xiangwanxian No.13 Cd1 0.0983c 0.1219c 0.2029c 0.0599c 0.1033c 0.0904c
Cd2 0.5169b 0.7114b 1.2193b 0.3150b 0.5433b 0.4755b
Cd3 0.9509a 1.3159a 2.1325a 0.5794a 0.9995a 0.8748a

"

品种Variety Cd浓度Cd concentration 实粒 Filled grain 空粒Empty grain 枝梗Branch 总量Total
天优华占 Cd1 6.72c 0.92c 0.43c 8.07c
Tianyouhuazhan Cd2 36.37b 6.27b 3.28b 45.92b
Cd3 43.31a 9.27a 6.10a 58.68a
星2号 Cd1 4.19c 0.44c 0.34c 4.97c
Xing No.2 Cd2 30.76b 3.26b 2.43b 36.44b
Cd3 41.86a 7.92a 5.24a 55.03a
湘晚籼13号 Cd1 1.71c 0.32c 0.20c 2.23c
Xiangwanxian No.13 Cd2 8.80b 1.92b 1.23b 11.96b
Cd3 15.25a 3.16a 2.18a 20.58a

Table 4

Effects of soil Cd content on Cd distribution proportion in different parts of rice panicle"

品种
Variety		 Cd浓度
Cd concentration		 占穗部Cd总量比例(%)
Proportion to total Cd in panicle
实粒
Filled grain		 空粒
Empty grain		 枝梗
Branch
天优华占 Cd1 83.32 11.35 5.33
Tianyouhuazhan Cd2 79.21 13.65 7.14
Cd3 73.80 15.80 10.40
星2号 Cd1 84.28 8.88 6.84
Xing No.2 Cd2 84.40 8.94 6.66
Cd3 76.07 14.40 9.53
湘晚籼13号 Cd1 76.58 14.38 9.04
Xiangwanxian No.13 Cd2 73.62 16.08 10.30
Cd3 74.10 15.33 10.57
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