Journal Article

Patterns of shoot mortality in <i>Betula platyphylla</i> in northern Japan

Kiyoshi Umeki, Tatsuyuki Seino, Eun-Mi Lim and Tsuyoshi Honjo

in Tree Physiology

Volume 26, issue 5, pages 623-632
Published in print May 2006 | ISSN: 0829-318X
Published online May 2006 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/26.5.623
Patterns of shoot mortality in Betula platyphylla in northern Japan

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To understand the development of crown structure in Betula platyphylla Sukatch., mortality patterns of long shoots were analyzed quantitatively. We selected 25 saplings growing under various light conditions and measured the relative photosynthetically active radiation (rPAR) at, and the three-dimensional position of, first-order branches. A long shoot was assigned “no buds” (NB) status if it lacked buds at the end of the growing season, including at the tips of short shoots. A long shoot was classified as dead if it was NB and all the offspring long shoots issuing from it were NB. The probability that a leafy long shoot (a current-year long shoot with leaves or an older long shoot with short shoots with leaves) would become NB by the end of the season was positively dependent on shoot age and branch age, and negatively dependent on shoot length, centripetal shoot order, branch height and rPAR at the branch. Randomization tests revealed that shoots became NB and dead in clusters of connected shoots. In particular, shoot clusters originating from 3-year-old shoots were more likely to die than expected if each shoot was assumed to become NB regardless of the connection. Stepwise logistic regression revealed that the maximum rPAR within the crown of an individual tree had a significant effect on the mortality rate of 3-year-old shoot clusters, together with the rPAR at the level of the branch and other structural entities. Correlative inhibition is an important mechanism for determining shoot mortality patterns.

Keywords: bud formation; correlative inhibition; crown development; crown structure; light conditions; spatial pattern

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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