Open AccessDemonstration and study of characters of foliar « compensatory growth» phenomenon in grapevine (<em>Vitis vinifera</em> L.)
Author(s) -
Jean-Claude Fournioux
Publication year - 1996
Publication title -
oeno one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.516
H-Index - 13
ISSN - 2494-1271
DOI - 10.20870/oeno-one.1996.30.2.1109
Subject(s) - compensatory growth (organ) , vitis vinifera , xanthium , apical dominance , biology , photosynthesis , gibberellic acid , elongation , growth rate , gibberellin , auxin , botany , vine , plant growth , horticulture , shoot , germination , gene , mathematics , endocrinology , biochemistry , kidney , materials science , geometry , ultimate tensile strength , metallurgy
Defoliation and decapitation experiments showed that the growth of a grapevine leaf was inhibited by both the terminal bud and the younger higher leaves. There is a phenomenon of synergy between these two influences. A young leaf freed of these two influences showed a higher growth rate than the norm ; this is « compensatory growth ». It is when a leaf is in its phase of maximal growth that it is most able to realize this &laquo compensatory growth ». This is not due to a longer growth time, but more to a faster growth rate. This « compensatory growth » is not the consequence of competition between leaf growth and internodal elongation. Exogenous applications of auxins prevented or restricted this growth; gibberellic acid had no effect. These results partly explain those of other authors who demonstrate that reduction in the leaf area of a vine is accompanied by an increase in photosynthetic efficiency of the remaining leaves.