TITLE

Shoot population recruitment from a bud bank over two seasons of undisturbed growth of Leymus chinensis

AUTHOR(S)
Ji-tao Zhang; Chun-sheng Mu; De-li Wang; Jun-feng Wang; Gui-xiang Chen
PUB. DATE
December 2009
SOURCE
Botany;Dec2009, Vol. 87 Issue 12, p1242
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Shoots of many clonal species are iterated seasonally by programmed growth from bud banks. Buds are not all the same but differ in their positions; these positions determine their densities, trigger times, and seasonal dynamics. To determine how different bud types contribute to a shoot population in an undisturbed environment, the densities of each bud type and daughter-shoot type were investigated in Leymus chinensis (Trin.) Tzvelev. New horizontal rhizomes (A1-1) start to grow in late May, but new vertical buds (including the vertical apical rhizome buds (A1-2), axillary rhizome buds (B1), and axillary shoot buds (C1)) emerge in late June; after late June or late July, the density of A1-1 gradually decreased, whereas the vertical buds increased. In mid-season, the presence of a high proportion of A1-1, suggests that plants pursue a spreading strategy. Late in the season, a high proportion of vertical buds suggests that they adopt a propagation strategy. At the end of the growing season, the stable contributions of type-specific buds (A1-2, 16%; B1, 5%; C1, 79%) to the overall shoot population may explain the dominance of this species throughout the eastern Eurasian Steppe. Developing a clearer understanding of bud dynamics and their type-specific contributions under undisturbed conditions, is a necessary prerequisite for predicting their responses under disturbed conditions.
ACCESSION #
47129599

 

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