| 张文萍,管啸,钟诚,易宇,肖卫华,易达理,杨良玖,吴根义.施磷增氧条件对水稻光合特性及镉吸收分配的影响[J].农业环境科学学报,2022,41(9):1875-1886. |
| 施磷增氧条件对水稻光合特性及镉吸收分配的影响 |
| Effects of phosphorus and oxygation on photosynthetic characteristics, cadmium absorption, and distribution in rice |
| 投稿时间：2021-11-20 |
| DOI：10.11654/jaes.2021-1346 |
| 中文关键词: 叶片光合特性 镉吸收 施磷 增氧灌溉 氧磷互作 水稻 |
| 英文关键词: leaf photosynthetic characteristics cadmium absorption phosphorus application oxygation the interaction of oxygation and phosphorus application rice |
| 基金项目:湖南省水利科技一般项目（XSKJ2021000-16，XSKJ2021000-22）；国家自然科学基金青年科学基金项目（51909088） |
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| 中文摘要: |
| 为探明水稻镉吸收及叶片光合特性对增氧条件下施磷量的响应特征，明确施磷量和根际增氧的作用效果，以杂交水稻C两优608为材料，考虑施磷水平和灌溉方式两个主要因素，设置4个施磷（P2O5）水平，即P1（不施磷）、P2（0.18 g·kg-1）、P3（0.36 g·kg-1）、P4（0.54 g·kg-1），2种灌溉方式，即NI （不增氧灌溉）、OI （增氧灌溉），采用盆栽试验研究施磷与增氧对水稻各生育期叶片光合特性及成熟期镉吸收及迁移转运的影响规律，确定了水稻叶片光合特性与水稻镉吸收的对应关系，揭示了施磷与增氧降低水稻成熟期籽粒镉含量的机理。结果表明：与不施磷相比，无论增氧与否，施磷均可促进水稻成熟期根部、秸秆部镉的吸收与转运；增氧处理下水稻镉由秸秆部向籽粒的转运系数、籽粒镉累积分配比例均低于不增氧处理，秸秆部镉累积分配比例均高于不增氧处理；不外施磷肥情况下，增氧处理水稻成熟期籽粒镉含量最低（0.13 mg·kg-1），水稻各部位镉多集中于根部（33.95%）和秸秆部（46.18%），只有19.87%集中于籽粒。抽穗期、灌浆期是影响水稻成熟期镉吸收的关键时期，增氧在提高灌浆期净光合能力的同时，还促进了镉由水稻根部向秸秆部转移，降低了镉从秸秆部向籽粒的转移，使水稻镉进行重新分配。研究表明，增氧可通过调整水稻内在敏感性，降低水稻成熟期籽粒镉含量及镉从秸秆部向籽粒的转移能力。 |
| 英文摘要: |
| This study aimed to investigate the the response characteristics of cadmium(Cd) absorption and leaf photosynthetic characteristics under the interaction of oxygation and phosphorus application and to clarify the effect of oxygation and phosphorus application. In this study, a pot experiment was conducted using a hybrid rice C liangyou 608 as test material. Four P(P2O5)application levels, namely P1(no P), P2(0.18 g·kg-1), P3(0.36 g·kg-1), and P4(0.54 g·kg-1)and two irrigation methods consisting of non-oxygation irrigation(NI)method and oxygation irrigation(OI)method were designed. The dynamic change characteristics of leaf photosynthetic characteristics at different growth stage of rice and Cd migration and translocation regularity at maturity growth stage of rice were systematically studied. The relationship between Cd absorption and leaf photosynthetic characteristics was determined to reveal the mechanism of Cd content reduction in rice grains(Grain-Cd)under oxygation and P at maturity growth stage. The results showed that, compared with P1 treatment, P application promoted the absorption and translocation of Cd in rice roots and straw at maturity stage with NI or OI. In addition, translocation factors from straw to grain and Cd distribution percentage in rice grains under OI was lower than that under NI, and Cd distribution percentage in rice straw under OI was higher than that under NI. Grain-Cd of OIP1 was the lowest(0.13 mg·kg-1). Most of the Cd was concentrated in the roots(33.95%)and straw(46.18%), and only 19.87% of Cd was distributed in grains. Heading and filling stages were the key stages that affect Cd absorption at maturity stage. Oxygation method promoted the increase of photosynthetic capacity at the filling stage, promoted the transfer of Cd from root to straw, and reduced the transfer of Cd from straw to grain, redistributing Cd in rice. Our study implies that oxygation can adjust rice inner sensitivity to promote Cd redistribution in rice organs, and it provides a reference for promoting theoretical innovation and technical integration of regulating Cd absorption and translocation in rice in the hilly areas of south China. |
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