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Chiral changes of cortical microtubule orientations in epidermis of sunflower hypocotyls. The effect of blue and red light

100%

Burian A.

Acta Societatis Botanicorum Poloniae

2007

tom 76

nr 4

269-275

Light and developmental processes affect the cortical microtubule (cMT) orientation. The cMT orientation with a special regard to its chirality was analyzed under the outer epidermal cell walls in different regions of sunflower hypocotyls kept in darkness and after irradiation with blue and red light. The results show that the cMT orientation depends on the cell position along hypocotyl, but generally cMTs are oblique. The oblique orientation has defined chirality: either of Z-form (right-handed) or S-form (left-handed). In the lower region of hypocotyls the Z-form dominates. After irradiation of hypocotyls with blue light this domination has been maintained and appeared also in the upper region. In contrast, after irradiation with red light the Z-form domination has not been apparent. It is proposed that in darkness, variations of cMT orientations in the epidermis along the hypocotyl are due to developmental processes, while blue and red light affect the cMT orientation via "shifting" these processes backward and forward, respectively.

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1 Acta Societatis Botanicorum Poloniae

1 Burian A.

1 2007

Wyniki wyszukiwania

Chiral changes of cortical microtubule orientations in epidermis of sunflower hypocotyls. The effect of blue and red light