水稻籽粒中镉的来源

doi:10.3864/j.issn.0578-1752.2018.10.013

Abstract

Abstract:

【Objective】 The objective of this study aimed to understand the sources of cadmium accumulated in the rice grain and to offer scientific support and best timing of agronomic measures to secure safety rice production. 【Method】 The study involved a pot hydroponic experiment with three Cd concentrations of 0, 0.2 and 0.5 mg·L^-1 by transplanting uniform rice plants at fully heading stage from a field with Cd contamination. Besides, the rice in the same field were also observed. The rice samples from hydroponic culture were harvested at maturity and those from the field were sampled at full heading stage, milk stage, dough stage and maturity. Dry weight and tissue Cd contents were analyzed for all the samples. 【Result】 The results showed that Cd accumulated in the rice grain was mainly transferred from the root and culm where Cd was stored before full heading in the Cd 0 treatment of the hydroponic culture. When available Cd was low in the soil (i.e., the treatment with rice kept growing in the paddy field), Cd accumulated in the rice grain was from both plant tissues stored Cd before heading and soil Cd uptake by rice after heading. The leaf and chaff appeared as net sources for Cd transferred to the rice grain, while the culm and root behaved as both pools for Cd accumulation and sources to the grain. When the rice grew in relatively high Cd content media (i.e., Cd 0.2 and Cd 0.5 treatments), Cd accumulated in the rice grain was mainly from direct uptake of Cd by the plant and small portions from different rice organs. 【Conclusion】 The Cd accumulated in the grain is transferred from different rice organs before heading stage and from direct uptake from soil/medium; the higher the available Cd in soil/medium, the higher Cd accumulated in the grain; only when there is no available Cd in the soil/medium, the Cd stored in different rice organs becomes the sole source of grain Cd. The culm and root are the two major locations for Cd storage and output in the rice plant. Heading to maturity stages are crucial to control Cd accumulation in rice grain and thus, are key period to secure production of safety rice if proper measures are taken to reduce available Cd in the growth medium as well as its uptake by direct root uptake and transport to the grain.

Key words: rice grain, cadmium, origin, contamination

Hua YU, YuXian SHANGGUAN, ShiHua TU, YuSheng QIN, Kun CHEN, DaoQuan CHEN, QianCong LIU. Sources of Cadmium Accumulated in Rice Grain[J].Scientia Agricultura Sinica, 2018, 51(10): 1940-1947.

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References 34

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处理 Treatment	糙米重 Brown rice wt (g/plant)	谷壳重 Chaff wt (g/plant)	茎秆重 Culm wt (g/plant)	叶重 Leaf wt (g/plant)	根重 Root wt (g/plant)
田间样 Field sample
齐穗期 Full heading stage	-	8.93a	35.82a	15.41ab	6.35bcd
灌浆期 Milk stage	9.13c	8.53a	31.95b	13.80ab	6.29bcd
腊熟期 Dough stage	27.53b	8.90a	28.07c	13.52ab	5.19d
成熟期 Mature stage	35.98a	8.94a	27.81c	12.19b	5.53cd
水培样(成熟期) Hydroponics sample (Mature stage)
Cd 0	36.54a	8.11a	26.39cd	15.97a	8.70a
Cd 0.2	35.43a	7.93a	24.28d	15.16ab	7.95ab
Cd 0.5	34.08a	7.90a	24.85cd	14.18ab	7.36abc

处理 Treatment	Cd浓度 Cd content		Cd累积量 Cd accumulated
处理 Treatment	(mg·kg^-1)	(±%*)	(μg/ plant)	(±%)
田间样 Field sample
齐穗期 Full heading stage	-	-	-	-
灌浆期 Milk stage	0.1693c	-	1.49b	-
腊熟期 Dough stage	0.1323c	-21.85	3.67b	+145.92
成熟期 Mature stage	0.1233c	-27.17	4.40b	+194.28
水培样(成熟期) Hydroponics sample (Mature stage)
Cd 0	0.1488c	-	5.44b	-
Cd 0.2	1.1999b	+706.38	42.89a	+688.97
Cd 0.5	1.5925a	+970.23	55.24a	+916.11

处理 Treatment	茎秆镉 Cd in culm		叶片镉 Cd in leaf		谷壳镉 Cd in chaff		根部镉 Cd in root
处理 Treatment	浓度 Content (mg·kg^-1)	累积量 Accumulation (μg/plant)	浓度 Content (mg·kg^-1)	累积量 Accumulation (μg/plant)	浓度 Content (mg·kg^-1)	累积量 Accumulation (μg/plant)	浓度 Content (mg·kg^-1)	累积量 Accumulation (μg/plant)
田间样Field sample
齐穗期 Full heading stage	0.2875c	10.32c	0.0912c	1.41c	0.0812c	0.73bc	3.2637b	21.05b
灌浆期Milk stage	0.5260c	16.83c	0.0834c	1.14c	0.0731c	0.60bcd	3.2951b	20.85b
腊熟期Dough stage	0.5686c	16.09c	0.0835c	1.13c	0.0425de	0.37cd	3.2845b	20.39b
成熟期Mature stage	0.6583c	18.45c	0.0791c	0.97c	0.0275e	0.25d	3.9529b	22.18b
水培样(成熟期) Hydroponics sample (Mature stage)
Cd 0	0.5040c	13.27c	0.3108c	4.95c	0.0584cd	0.48cd	0.8034b	6.88b
Cd 0.2	7.5569b	182.02b	1.8003b	27.23b	0.1103b	0.87b	25.6589a	203.16a
Cd 0.5	13.7115a	337.09a	4.3433a	61.56a	0.1756a	1.39a	28.9305a	211.05a

处理 Treatment	Cd分配比例 Distribution of Cd（%）
处理 Treatment	糙米 Brown rice	谷壳 Chaff	茎秆 Culm	叶 Leaf	根 Root
田间样Field sample
齐穗期 Full heading stage	-	2.19	30.79	4.19	62.83
灌浆期Milk stage	3.65	1.46	41.14	2.78	50.97
腊熟期Dough stage	9.51	0.97	41.63	2.92	44.98
成熟期Mature stage	9.51	0.54	39.90	2.09	47.97
水培样(成熟期) Hydroponics sample (Mature stage)
Cd 0	17.53	1.54	42.80	15.95	22.18
Cd 0.2	9.40	0.19	39.90	5.97	44.54
Cd 0.5	8.29	0.21	50.59	9.24	31.67

Sources of Cadmium Accumulated in Rice Grain

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