ROUSSEAUX Maria Cecilia
Light Quality Environment and Photomorphological Responses of Young Olive Trees
LADUX, FEDERICO J.; TRENTACOSTE, EDUARDO R.; SEARLES, PETER S.; ROUSSEAUX, M. CECILIA
Año: 2021 vol. 7
Tree densities have increased greatly in olive orchards over the last few decades. In manyannual crop species, increased density reduces the horizontal red/far-red (R/FR) and blue/green(B/G) ratios during canopy development even before direct shading occurs, and such changes areknown to alter plant morphology. This study with olive trees evaluated: (1) whether the leaf areaindex (LAI) of neighboring trees modifies the light quality environment prior to a tree being directlyshaded and (2) the potential morphological responses of three olive cultivars to changes in lightquality. Increasing LAI using different spatial arrangements of potted, three-year-old trees reducedthe horizontal R/FR ratio more than that of the B/G ratio. Cultivar-specific responses to low R/FRratio were observed for individual leaf area and aboveground/belowground biomass ratio usinglaterally positioned FR mirrors or green fences. No statistically significant responses were detectedin response to green vegetation fences that reduced both horizontal R/FR and B/G ratios, but acluster analysis grouped together the overall morphological responses to both FR mirrors and greenfences. These results in olive trees suggest that cultivar differences in response to light quality maybe relevant for understanding adaptation to dense orchards and identifying cultivars best suitedto them.