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Root Respiration, Photosynthesis and Grain Yield of Two Spring Wheat in Response to Soil Drying

机译:干旱对两种春小麦根系呼吸,光合作用和籽粒产量的影响

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摘要

The effects of soil water regime and wheat cultivar, differing in drought tolerance with respect to root respiration and grain yield, were investigated in a greenhouse experiment. Two spring wheat (Triticum aestivum) cultivars, a drought sensitive (Longchun 8139-2) and drought tolerant (Dingxi 24) were grown in PVC tubes (120 cm in length and 10 cm in diameter) under an automatic rain-shelter. Plants were subjected to three soil moisture regimes: (1) well-watered control (85% field water capacity, FWC); (2) moderate drought stress (50% FWC) and (3) severe drought stress (30% FWC). The aim was to study the influence of root respiration on grain yield under soil drying conditions. In the experiment, severe drought stress significantly (p < 0.05) reduced shoot and root biomass, photosynthesis and root respiration rate for both cultivars, but the extent of the decreases was greater for Dingxi 24 compared to that for Longchun 8139-2. Compared with Dingxi 24, 0.04 and 0.07 mg glucose m−2 s−1 of additional energy, equivalent to 0.78 and 1.43 J m−2 s−1, was used for water absorption by Longchun 8139-2 under moderate and severe drought stress, respectively. Although the grain yield of both cultivars decreased with declining soil moisture, loss was greater in Longchun 8139-2 than in Dingxi 24, especially under severe drought stress. The drought tolerance cultivar (Dingxi 24), had a higher biomass and metabolic activity under severe drought stress compared to the sensitive cultivar (Longchun 8139-2), which resulted in further limitation of grain yield. Results show that root respiration, carbohydrates allocation (root:shoot ratio) and grain yield were closely related to soil water status and wheat cultivar. Reductions in root respiration and root biomass under severe soil drying can improve drought tolerant wheat growth and physiological activity during soil drying and improve grain yield, and hence should be advantageous over a drought sensitive cultivar in arid regions.
机译:在温室试验中研究了土壤水分状况和小麦品种对根系呼吸和籽粒产量的干旱耐受性的影响。在自动防雨棚下,在长120 cm,直径10 cm的PVC管中种植了两个春小麦品种,一个耐旱品种(L春8139-2)和一个耐旱品种(定西24)。使植物经受三种土壤水分处理:(1)灌溉良好的对照(85%的田间持水量,FWC); (2)中度干旱胁迫(50%FWC)和(3)重度干旱胁迫(30%FWC)。目的是研究土壤干燥条件下根系呼吸对谷物产量的影响。在试验中,严重干旱胁迫显着(p <0.05)降低了两个品种的茎和根生物量,光合作用和根呼吸速率,但定西24的下降幅度大于龙春8139-2。与定西24号相比,0.04和0.07 mg葡萄糖m-2 s-1 的附加能量分别为0.78和1.43 J m-2 s-1 分别用于龙春8139-2在中度和重度干旱胁迫下的吸水率。尽管两个品种的籽粒产量都随着土壤水分的下降而降低,但龙春8139-2的损失要比定西24大,尤其是在严重干旱胁迫下。与敏感品种(ong春8139-2)相比,耐旱品种(定西24)在重度干旱胁迫下具有较高的生物量和代谢活性,导致籽粒产量进一步受到限制。结果表明,根系呼吸作用,碳水化合物分配(根:茎比)和谷物产量与土壤水分状况和小麦品种密切相关。在严峻的土壤干燥条件下减少根系呼吸和根系生物量可以改善耐旱小麦的生长和土壤干燥过程中的生理活性,并提高谷物产量,因此在干旱地区优于干旱敏感型品种。

著录项

  • 来源
    《Plant Growth Regulation》 |2005年第3期|233-240|共8页
  • 作者

    Hong Sheng Liu; Feng Min Li;

  • 作者单位

    Laboratory of Quantitative Vegetation Ecology Institute of Botany The Chinese Academy of SciencesThe Stake Key Laboratory of Arid Agroecology Lanzhou University;

    The Stake Key Laboratory of Arid Agroecology Lanzhou UniversityState Key Laboratory of Soil Erosion and Dryland Farming Institute of Soil Erosion and Water Conservation Chinese Academy of Sciences;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energy requirement; Grain yield; Root respiration; Soil water regime; Water use efficiency;

    机译:能量需求;粮食产量;根系呼吸;土壤水分状况;水分利用效率;

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