4.7 Review

How Does the Waterlogging Regime Affect Crop Yield? A Global Meta-Analysis

Journal

FRONTIERS IN PLANT SCIENCE
Volume 12, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.634898

Keywords

crop type; growth stage; waterlogging duration; grain yield; meta-analysis

Categories

Funding

  1. National Key R&D Program of China [2019YFD1000700, 2019YFD1000702, 2017YFD0300400]
  2. National Natural Science Foundation of China [31371529]
  3. National Millet and Sorghum Industrial Technology System [CARS-06-13.5-A26]
  4. National Science and Technology Supporting Plan [2014BAD07B03, 2019YFD100700, 2019YFD100702]

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The study found that waterlogging significantly decreases crop yield by reducing factors such as grain weight, biomass, plant height, photosynthetic rate, and leaf area index. The impact of waterlogging on crop yield varies depending on crop type, and the longer the duration of waterlogging, the greater the reduction in yield.
Waterlogging, an abiotic stress, severely restricts crop yield in various parts of the world. Thus, we conducted a meta-analysis of 2,419 comparisons from 115 studies to comprehensively evaluate the overall change in crop yield induced by waterlogging in the global region. The results suggested that waterlogging obviously decreased crop yield by 32.9% on average, compared with no waterlogging, which was a result of a reduced 1,000-grain weight (13.67%), biomass (28.89%), plant height (10.68%), net photosynthetic rate (P-n, 39.04%), and leaf area index (LAI, 22.89%). The overall effect of a waterlogging regime on crop yield is related to the crop type; the crop yield reduction varied between wheat (25.53%) and cotton (59.95%), with an overall average value of 36.81% under field conditions. In addition, we also found that compared with no waterlogging, waterlogging in the reproductive growth stage (41.90%) caused a greater yield reduction than in the vegetative growth stage (34.75%). Furthermore, decreases in crop yield were observed with an extension in the waterlogging duration; the greatest decreases in crop yield occurred at 15 < D <= 28 (53.19 and 55.96%) under field and potted conditions, respectively. Overall, the results of this meta-analysis showed that waterlogging can decrease crop yield and was mainly affected by crop type, growth stage, and experimental duration.

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