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Differences in Response to Low Phosphorus Stress Among indica Rice Varieties and Their Agronomic and Physiological Characteristics

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  • Jiangsu Key Laboratory of Crop Genetics and Physiology / Jiangsu Key Laboratory of Crop Cultivation and Physiology / Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
*Corresponding author, E-mail: yapingzh2013@163.com

Received date: 2021-03-05

  Revised date: 2021-05-11

  Online published: 2021-07-10

Abstract

【Objective】 The purpose of this study is to explore the differences in response to low phosphorus stress among indica rice varieties and their agronomic and physiological characteristics. 【Method】 Twelve medium-maturity indica rice varieties applied in production in Jiangsu Province in the last 80 years were used and two levels of phosphorus concentrations, low phosphorus level (1/20 of the phosphorus concentration of the standard nutrient solution formulation, LP) and the normal phosphorus concentration (International Rice Research Institute standard nutrient solution formulation, control, NP), were designed. 【Result】 The low phosphorus tolerance index was chosen to evaluate the tolerance to low phosphorus (LP) for rice varieties, and the tested cultivars were classified into three categories based on the index: strong tolerance to LP (LP tolerance index ≥0.9), medium resistance to LP (0.5< LP tolerance index <0.9) and weak tolerance to LP (LP tolerance index ≤0.5). Two varieties with strong tolerance to low phosphorus and two with weak tolerance were chosen to investigate the agronomic and physiological characteristics. Plants grown at LP produced significantly lower grain yield than those grown at NP. Compared to NP, LP increased phosphorus translocation efficiency (PTE), internal phosphorus efficiency (IPE) and phosphorus harvest index (PHI). Under the LP condition, PTE and IPE were higher for the varieties with strong tolerance to low phosphorus than for the varieties with weak tolerance to low phosphorus. Compared to the varieties with weak tolerance to low phosphorus, the varieties with strong tolerance to low phosphorus had greater shoot and root biomass, NSC accumulation and remobilization in stem and sheath, less reduction in root oxidation activity, higher increase in acid phosphatase activity in root, more tillers, greater leaf area index and leaf photosynthetic rate at booting stage and grain filling stage. 【Conclusion】 Compared to the varieties with weak tolerance to low phosphorus, larger dry matter accumulation, NSC accumulation and remobilization, root oxidation activity, acid phosphatase activity, leaf photosynthesis rate, and phosphorus utilization efficiency were important agronomic and physiological traits for the varieties with strong tolerance to low phosphorus under LP level.

Cite this article

Shengfeng QIAO, Yaping DENG, Hanbing QU, Weiyang ZHANG, Junfei GU, Hao ZHANG, Lijun LIU, Zhiqin WANG, Jianchang YANG . Differences in Response to Low Phosphorus Stress Among indica Rice Varieties and Their Agronomic and Physiological Characteristics[J]. Chinese Journal OF Rice Science, 2021 , 35(4) : 396 -406 . DOI: 10.16819/j.1001-7216.2021.210304

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