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Crude extract of the cyanobacterium, Hapalosiphon sp., causes a cessation of root elongation and cell division in several plant species
Author(s) -
SANEVAS NUTTHA,
SUNOHARA YUKARI,
MATSUMOTO HIROSHI
Publication year - 2006
Publication title -
weed biology and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 36
eISSN - 1445-6664
pISSN - 1444-6162
DOI - 10.1111/j.1445-6664.2006.00188.x
Subject(s) - biology , shoot , mitotic index , meristem , anaphase , allium , botany , elongation , mitosis , cell division , germination , telophase , division (mathematics) , metaphase , balsaminaceae , cell , microbiology and biotechnology , impatiens , chromosome , cell cycle , materials science , mathematics , arithmetic , genetics , ultimate tensile strength , biochemistry , metallurgy , gene , cultivar
The phytotoxic activities of the crude extract from the cyanobacterium, Hapalosiphon sp., on the initial growth and root cell division of several plant species were investigated. Although the germination percentages of the plants were not affected by the extract, their root and shoot growth were remarkably suppressed, depending on the extract concentrations. Roots were more sensitive to the extract than shoots and the sensitivity, determined by the I 50 concentrations between the susceptible and tolerant species, differed by 5 and 11 times in dicotyledonous and monocotyledonous plants, respectively. The mitotic index for wheat ( Triticum aestivum L. cv. Norin 61) root cells was not affected, but the mitotic index for onion ( Allium cepa L. cv. Raputa II) was reduced with the increasing concentration of the extract. In the onion root meristem, the number of cells in prophase, metaphase, anaphase, and telophase were decreased significantly with 6 g DW L −1 (g dry weight of algae L −1 ). This suggests that the extract might inhibit the processes regulating the entry of cells into mitosis.