Do changes in spring phenology affect earlywood vessels? Perspective from the xylogenesis monitoring of two sympatric ring‐porous oaks

• Published in: The New phytologist Vol. 209; no. 2; pp. 521 - 530
• Main Authors: Pérez‐de‐Lis, Gonzalo, Rossi, Sergio, Vázquez‐Ruiz, Rosa Ana, Rozas, Vicente, García‐González, Ignacio
• Format: Journal Article
• Language: English
• Published: England Academic Press 2016; New Phytologist Trust; Wiley Subscription Services, Inc
• Subjects: budburst; cambium; Diameters; earlywood; ecological wood anatomy; Enlargement; growing degree days; heat sums; hydraulic diameter; Leaves; Monitoring; Oak; Phenology; Plant Leaves - physiology; Quercus; Quercus - anatomy & histology; Quercus - growth & development; Quercus - physiology; Quercus pyrenaica; Quercus robur; Spain; Species; Species Specificity; spring; Sympatric populations; tree and stand measurements; Trees - growth & development; Vessels; Weather; Wood - growth & development; Xylem; Xylem - anatomy & histology; Xylem - physiology; Iberian Peninsula; xylem; budburst; cambium; ecological wood anatomy; Quercus; growing degree days; hydraulic diameter
• ISSN: 0028-646X; 1469-8137
• DOI: 10.1111/nph.13610

This study addresses relationships between leaf phenology, xylogenesis, and functional xylem anatomy in two ring‐porous oak species, the temperate Quercus robur and the sub‐Mediterranean Q. pyrenaica. Earlywood vessel (EV) formation and leaf phenology were monitored in 2012 and 2013. Ten individuals per species were sampled at each of three sites located in NW Iberian Peninsula. EV areas measured on microcore sections were used to calculate the hydraulic tree diameter (Dₕ), in order to model relationships to phenology. Thermal requirements were evaluated using growing degree days (GDD). A species‐specific timing of growth resumption was found. The onset of EV formation and budburst were associated to a particular GDD in each species. The onset and duration of EV enlargement affected Dₕ (and EV size) in Q. robur, but hardly in Q. pyrenaica. The relationship between the timings of EV formation and xylem structure appears to be stronger for the temperate oak, whose larger vessels may result from thermal‐induced earlier resumption. In contrast, the sub‐Mediterranean oak would maintain a more conservative hydraulic architecture under warming conditions.