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    ARTICLE

    Leaf angle and light interception in sunflower (Helianthus annuus L.). Role of the petiole’s mechanical and anatomical properties

    Hernández LF

    Phyton-International Journal of Experimental Botany, Vol.79, pp. 109-115, 2010, DOI:10.32604/phyton.2010.79.109

    Abstract The relationships between (1) leaf biomass and morphology (lamina area and petiole and lamina inclination), (2) petiole’s mechanical and structural properties, and (3) the vertical light gradient inside the crop’s canopy were studied in field grown sunflower (Helianthus annuus L.) plants, maintained at optimum soil water and mineral levels. At flowering, incident photosynthetic active radiation (PAR) was measured at the top of the canopy and on individual leaves using a quantum sensor. The fraction of direct incident radiation which passed through the canopy reaching each individual leaf was then calculated. Individual petiole and lamina inclination angles (iaPetioleMore >

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