Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 566304
Title Responses of Lowland, Upland and Aerobic Rice Genotypes to Water Limitation During Different Phases
Author(s) Vijayaraghavareddy, Preethi; Xinyou, Yin; Struik, Paul C.; Makarla, Udayakumar; Sreeman, Sheshshayee
Source Rice Science 27 (2020)4. - ISSN 1672-6308 - p. 345 - 354.
DOI https://doi.org/10.1016/j.rsci.2020.05.009
Department(s) Centre for Crop Systems Analysis
PE&RC
Crop Physiology
Publication type Refereed Article in a scientific journal
Publication year 2020
Keyword(s) Aerobic - Oryza sativa - Phenology - Upland - Water limitation - yield
Abstract

Rice yield reduction due to water limitation depends on its severity and duration and on the phenological stage of its occurrence. We exposed three contrasting rice genotypes, IR64, UPLRi7 and Apo (adapted to lowland, upland and aerobic conditions, respectively), to three water regimes (puddle, 100% and 60% field capacity) in pots during the vegetative (GSI), flowering (GSII) and grain filling (GSIII) stages. Stress at all the three stages significantly reduced yield especially in lowland genotype IR64. Effect of water limitation was more severe at GSII than at the other two stages. Stress at GSI stage reduced both source activity (leaf area and photosynthetic rate) and sink capacity (tiller number or panicle number per pot). When stress was imposed at GSII, spikelet fertility was most affected in all the three genotypes. In both GSII and GSIII, although leaf area was constant in all the three water regimes, estimated relative whole-plant photosynthesis was strongly associated with yield reduction. Reduced photosynthesis due to stress at any given stage was found to have direct impact on yield. Compared to the other genotypes, Apo had deeper roots and maintained a better water relation, thus, higher carbon gain and spikelet viability, and ultimately, higher biomass and productivity under water-limited conditions. Therefore, screening for these stage-dependent adaptive mechanisms is crucial in breeding for sustained rice production under water limitation.

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