Articles
BORON NUTRITION IN HIGHER PLANTS
Article number
984_2
Pages
37 – 45
Language
English
Abstract
A function of boron (B) in higher plants is proposed.
A B-polysaccharide complex was isolated and purified from plant cell walls and the sugar moiety was identified as rhamnogalacturonan II (RGII). In this complex B crosslinks two pectic polysaccharide chains through borate-aspiosyl ester bonding, and this bridge is strengthened by Ca2+. That is, the pectic network is assembled with B and Ca2+ as a nail and screw.
Deprivation of B from culture solutions brings about cell death, which is mediated by excessive production of reactive-oxygen molecules, such as hydrogen peroxide.
The link between incomplete cell wall and hydrogen peroxide evolution should be examined further.
A B-polysaccharide complex was isolated and purified from plant cell walls and the sugar moiety was identified as rhamnogalacturonan II (RGII). In this complex B crosslinks two pectic polysaccharide chains through borate-aspiosyl ester bonding, and this bridge is strengthened by Ca2+. That is, the pectic network is assembled with B and Ca2+ as a nail and screw.
Deprivation of B from culture solutions brings about cell death, which is mediated by excessive production of reactive-oxygen molecules, such as hydrogen peroxide.
The link between incomplete cell wall and hydrogen peroxide evolution should be examined further.
Authors
M. Kobayashi, T. Matoh
Keywords
calcium, cell wall, pectic polysaccharide, rhamnogalacturonan II
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