RT info:eu-repo/semantics/article
T1 Is the responsiveness to light related to the differences in stem straightness among populations of Pinus pinaster?
A1 Sierra de Grado, María del Rosario
A1 Pando Fernández, Valentín
A1 Martínez Zurimendi, Pablo
A1 Moulia, Bruno
K1 Compression wood
K1 Madera de compresión
K1 Gravitropism
K1 Gravitropismo
K1 Photomorphogenesis
K1 Fotomorfogénesis
K1 Phototropism
K1 Fototropismo
AB Stem straightness is related to wood quality and yield. Although important geneticdifferences in stem straightness among the natural populations of Pinus pinaster are well established,the main drivers of these differences are not well known. Since the responses of trees to light arekey ecological features that induce stem curvature, we hypothesized that populations with betterstraightness should exhibit lower photomorphogenetic and phototropic sensitivity. We comparedthree populations to identify the main processes driven by primary and secondary growth that explaintheir differences in response to light. One-year-old seedlings were grown under two treatments—directsunlight and lateral light plus shade—for a period of 5 months. The length and the leaning of the stemswere measured weekly. The asymmetry of radial growth and compression wood (CW) formationwere analyzed in cross-sections. We found differences among the populations in photomorphogeneticand phototropic reactions. However, the population with straighter stems was not characterized byreduced sensitivity to light. Photo(gravi)tropic responses driven by primary growth and gravitropicresponses driven by secondary growth explained the kinetics of the stem leaning and CW pattern.Asymmetric radial growth and CW formation did not contribute to the phototropic reactions.
PB MDPI
SN 2223-7747
YR 2019
FD 2019
LK https://uvadoc.uva.es/handle/10324/53605
UL https://uvadoc.uva.es/handle/10324/53605
LA eng
NO Plants, 2019, vol. 8, n. 10, 383
NO Producción Científica
DS UVaDOC
RD 11-jul-2024