不同再生稻品种的镉积累转运差异
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湖南创新型省份建设专项经费资助项目(2025QK1006);国家重点研发计划专项(2023YFD2301400、2018YFD0301005)


Differences in cadmium accumulation and translocation among different ratoon rice varieties
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    摘要:

    以8个再生稻品种湘早籼45号(V1)、Y两优911(V2)、恒两优金农丝苗(V3)、甬优4149(V4)、Y两优9918(V5)、凤两优464(V6)、隆两优1988(V7)和两优121(V8)为材料,于2021年开展大田试验,比较了8个不同再生稻品种间产量与Cd吸收、转运及积累特性差异。结果表明:V5的头季与再生季产量均最高,实际产量分别为6.81、5.62 t/hm2,影响产量的主要因素是每穗粒数;头季与再生季糙米Cd含量从高至低依次为V3、V5、V1、V6、V8、V7、V2、V4,其原因主要是品种间Cd富集系数存在差异;头季除V3和V5外,其他品种糙米Cd含量均低于0.2 mg/kg;再生季中V2、V4、V7、V8的糙米Cd含量低于0.2 mg/kg;V3、V5的头季与再生季水稻穗部的Cd积累量较高,V2、V4的较低;相关性分析结果表明,糙米Cd含量与植株各器官(根、茎 、叶及稻桩)Cd含量及糙米镉富集系数呈极显著正相关,整体上与各器官镉转运系数的相关性不显著;此外,各品种头季糙米镉含量均低于再生季的,V3、V5及V6的穗部Cd积累量表现为头季的显著高于再生季的,而其他品种表现相反。兼顾水稻产量和糙米Cd含量情况,甬优4149(V4)可能适合种在镉污染稻田里,Cd超标风险较小。

    Abstract:

    Using eight ratoon rice varieties, Xiangzaoxian 45(V1), Yliangyou 911(V2), Hengliangyou Jinnongsimiao (V3), Yongyou 4149(V4), Yliangyou 9918(V5), Fengliangyou 464(V6), Longliangyou 1988(V7) and Liangyou 121 (V8) as materials, a field experiment was carried out in 2021 to compare the differences in yield and Cd absorption, translocation and accumulation characteristics among the 8 different ratoon rice varieties. The results showed that V5 had the highest yield in both the first and ratoon crops, with actual yields of 6.81 t/hm2 and 5.62 t/hm2, respectively. The main factor affecting yield was the number of grains per ear. V3 showed the highest Cd content in brown rice of the first and ratoon crops, followed by V3, V5, V1, V6, V8, V7, V2 and V4. The main reason was that there were significant differences in Cd bioaccumulation factors among varieties. In the first crop, except for V3 and V5, the Cd content of brown rice of other varieties was lower than 0.2 mg/kg; in the ratoon crop, the Cd content of brown rice of V2, V4, V7, and V8 was lower than 0.2 mg/kg. The Cd accumulation in the rice panicle in the first and ratoon crops was higher in V3 and V5, and lower in V2 and V4. The results of correlation analysis showed that the Cd content in brown rice and the Cd accumulation in the panicle were extremely significantly positively correlated with the Cd content in various organs of the plant(roots, stems, leaves and stubble) and the Cd bioaccumulation factors of brown rice, but were not significantly correlated with the Cd translocation factors of various organs. In addition, the Cd content of brown rice in the first crop of each variety was lower than that in the ratoon crop. The Cd accumulation in the panicle of V3, V5 and V6 was significantly higher in the first crop than that in the ratoon crop, while the other varieties was on the contrary. Taking into account the rice yield and Cd content in brown rice, Yongyou 4149(V4) is a variety with a lower risk of exceeding the Cd standard for rice fields contaminated with Cd.

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袁帅,蒋艳方,陈基旺,陈平平,张桂莲,周文新,易镇邪*.不同再生稻品种的镉积累转运差异[J].湖南农业大学学报(自然科学版),2025,51(3):1-8.

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  • 在线发布日期: 2025-07-15
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