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A novel water-saving and drought-resistance rice variety promotes phosphorus absorption through root secreting organic acid compounds to stabilize yield under water-saving condition

文献类型： 外文期刊

作者： Bi, Junguo 1 ; Hou, Danping 1 ; Zhang, Xianxian 2 ; Tan, Jinsong 1 ; Bi, Qingyu 1 ; Zhang, Kangkang 1 ; Liu, Yi 1 ; Wang, 1 ;

作者机构： 1.Shanghai Agrobiol Gene Ctr, 2901 Beidi Rd, Shanghai 201106, Peoples R China

2.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, 1000 Jinqi Rd, Shanghai, Peoples R China

3.Huazhong Agr Univ, Coll Plant Sci & Technol, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China

关键词： Water-saving and drought-resistance rice (WDR); Biomass; Phosphorus uptake; Root exudates; Irrigation regime; Metabolomics

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2021 年 315 卷

页码：

收录情况： SCI

摘要： More than 70% of global rice production depends on irrigation water, which has brought on a progressive reduction in the groundwater table. Further groundwater withdrawal are unsustainable for future rice production. Sustainable rice production calls for the use of resource-saving and environmentally friendly rice varieties. This study investigated the morphological and physiological mechanisms of biomass and tissue phosphorus accumulation in a water-saving and drought-resistance rice variety (Hanyou73) and a normal paddy rice variety (Hyou518) under different water management regimes. The two rice cultivars were grown in pot experiments carried out with factorial combinations of three water regimes, conventional irrigation (high irrigation rate, HR), 60% of conventional irrigation (medium irrigation rate, MR), and 20% of conventional irrigation (low irrigation rate, LR) for four-years. While the grain yield of Hanyou73 was similar as Hyou518 under HR, it was significantly higher than Hyou518 under MR and LR. Under deficit irrigation, the tissue-specific biomass of Hanyou73 was higher than that of Hyou518, and the total P accumulation of Hanyou73 was 70% greater than that of Hyou518. Meanwhile, the root growth, root oxidation activity, and absorption area of Hanyou73 under the MR and LR treatments were significantly higher than those of Hyou518. Analysis of root exudate metabolites revealed an abundance of organic acids produced by the Hanyou73 roots under, which may account for its higher P uptake. Overall, the findings of this study indicate that Hanyou73 promoted P uptake to maintain higher yields under deficit irrigation. The higher P uptake by Hanyou73 may be related to its altered root physiology, which may be the mechanism by which Hanyou73 adapts to water saving irrigation conditions and maintains its yield traits.

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