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Delayed leaf senescence during the grain filling phase, or stay green (SG), may be functional or cosmetic; the first being considered a valuable trait in breeding of many crop species. To establish whether canopy senescence patterns exhibited by two sunflower (Helianthus annuus L.) hybrids visually selected for slow post-anthesis canopy leaf area index (LAI) loss reflected functional, rather than...
Loss of nitrogen from the leaves and a reduction in specific leaf nitrogen (SLN, g N m -2 ) is associated with grain filling in sunflower (Helianthus annuus L.). To explore the relationship between crop radiation-use efficiency (RUE, g MJ -1 ) and SLN, crop biomass accumulation and radiation interception were measured between the bud-visible and physiological-maturity stages...
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