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Intercepted Solar Radiation during Seed Filling Determines Sunflower Weight per Seed and Oil Concentration
Author(s) -
Aguirrezábal Luis A. N.,
Lavaud Yorick,
Dosio Guillermo A. A.,
Izquierdo Natalia G.,
Andrade Fernando H.,
González Leila M.
Publication year - 2003
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2003.1520
Subject(s) - shading , photosynthetically active radiation , helianthus annuus , biology , sunflower , sowing , crop , agronomy , population , horticulture , dry weight , yield (engineering) , botany , photosynthesis , art , demography , materials science , sociology , metallurgy , visual arts
A reduction in intercepted photosynthetically active radiation (PAR) during a short period of seed filling could affect weight per seed and oil concentration in sunflower ( Helianthus annuus L.) depending when the reduction occurs. The main objectives of this work were (i) to determine the period of time during which intercepted PAR most influences final weight per seed and oil concentration, and (ii) to establish and validate relationships between intercepted PAR during such a period and oil yield components. Intercepted PAR was modified by shading (0, 50, or 80%) field grown crops during different periods of seed filling. Data from published and unpublished field experiments, in which intercepted PAR per plant was changed during the entire seed filling period by shading, thinning to reduce plant population, or both, were also used. All experiments were performed under adequate water and nutrient conditions. A reduction in intercepted PAR during 7 to 10 d of seed filling affected weight per seed and oil concentration. The developmental interval during which final weight per seed and oil concentration were best accounted for by accumulated intercepted PAR ( r 2 > 0.805) began at 250°C d and ended at 450°C days after flowering (DAF). The established relationships were validated with independent data. The relationships obtained in this work help to explain the effects of environment and crop management (sowing date, location, year) on oil yield variation.