Latewood formation by localized cooling of stems in conifers

Localized low temperatures of the stem induced narrow diameters and obvious thickening of secondary cell walls of tracheids, which were identified as latewood tracheids. In addition, artificial cooling of stems induced cessation of cambial activity.

Cooled-water circulation (A) and the system for passing cooled water around the main stem, at breast height, of an adult specimen of <em>Chamaecyparis obtusa</em> (B). Arrows indicate the cooled and non-cooled control portions of the stem.
Cooled-water circulation (A) and the system for passing cooled water around the main stem, at breast height, of an adult specimen of Chamaecyparis obtusa (B). Arrows indicate the cooled and non-cooled control portions of the stem. Photo by Begum et al.

Begum et al. consider that cambium and its derivatives can respond directly to changes in temperature and a decrease in the temperature of the stem is a critical factor in the control of cambial activity and xylem differentiation in trees.

Reference List

Shahanara Begum, Kayo Kudo, Yugo Matsuoka, Satoshi Nakaba, Yusuke Yamagishi, Eri Nabeshima, Md Hasnat Rahman, Widyanto Dwi Nugroho, Yuichiro Oribe, Hyun-O Jin, Ryo Funada, 2015, 'Localized cooling of stems induces latewood formation and cambial dormancy during seasons of active cambium in conifers', Annals of Botany, vol. 117, no. 3, pp. 465-477 http://dx.doi.org/10.1093/aob/mcv181