𝔖 Bobbio Scriptorium
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Boron — Key element in the actions of phytochrome and gravity?

✍ Scribed by Takuma Tanada

Publisher
Springer-Verlag
Year
1978
Tongue
English
Weight
241 KB
Volume
143
Category
Article
ISSN
0032-0935

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✦ Synopsis

Hypocotyl sections from dark-grown mung bean (Vigna radiata (L.) Wilczek) seedlings grown without boron exhibit little or no increase in the translocation of fluorescein in phloem cells following gravitational stimulation or red irradiation. In contrast, pretreatment of the hypocotyl sections with low concentrations of boric acid before red irradiation or gravitational stimulation results in a rapid increase in fluorescein movement. Mung bean root tips without boron fail to remain attached to a negativelycharged glass surface after several minutes of red irradiation. A low boron concentration in the solution induces tip attachment. The suggestion is made that boron is required to stabilize a positive electrostatic charge in the plasma membrane that is generated by the actions of phytochrome and gravity.

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