Potential bud bank responses to apical meristem damage and environmental variables: matching or complementing axillary meristems?

PLoS One. 2014 Feb 6;9(2):e88093. doi: 10.1371/journal.pone.0088093. eCollection 2014.

Abstract

Soil nutrients, dormant axillary meristem availability, and competition can influence plant tolerance to damage. However, the role of potential bud banks (adventitious meristems initiated only after injury) is not known. Examining Central European field populations of 22 species of short-lived monocarpic herbs exposed to various sources of damage, we hypothesized that: (1) with increasing injury severity, the number of axillary branches would decrease, due to axillary meristem limitation, whereas the number of adventitious shoots (typically induced by severe injury) would increase; (2) favorable environmental conditions would allow intact plants to branch more, resulting in stronger axillary meristem limitation than in unfavorable conditions; and (3) consequently, adventitious sprouting would be better enabled in favorable than unfavorable conditions. We found strong support for the first hypothesis, only limited support for the second, and none for the third. Our results imply that whereas soil nutrients and competition marginally influence plant tolerance to damage, potential bud banks enable plants to overcome meristem limitation from severe damage, and therefore better tolerate it. All the significant effects were found in intraspecific comparisons, whereas interspecific differences were not found. Monocarpic plants with potential bud banks therefore represent a distinct strategy occupying a narrow environmental niche. The disturbance regime typical for this niche remains to be examined, as do the costs associated with the banks of adventitious and axillary reserve meristems.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Environment*
  • Meristem / anatomy & histology
  • Meristem / physiology*
  • Organ Size
  • Plants / anatomy & histology
  • Species Specificity

Grants and funding

The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Grant Agency of the Czech Republic (P504/12/P540, GA526/09/0963) http://www.gacr.cz/; Institute of Botany, ASCR (RVO 67985939) http://www.ibot.cas.cz/; University of South Bohemia (GAJU 04-146/2013/P) http://www.jcu.cz/.