Daily Changes in the Competence for Photo- and Gravitropic Response by Potato Plantlets
2014
Тип документа:
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт:
Competence for phototropic (PT) and gravitropic (GT) bending by potato
plantlets grown in vitro manifests regular daily changes indicating
possible involvement of circadian regulation. Unilateral stimulation of
plantlets with blue light at dawn resulted in moderate PT response
regarding both attained curvature and long lag phase. The PT response
was the strongest between 8:00 and 12:00 h. Throughout the afternoon and
in the evening, bending rate and maximal PT curvature declined
significantly until 23:00 h. The GT response was fastest and strongest
for plantlets stimulated early in the morning and late in the evening.
During the rest of the day, GT competence did not change much apart from
a minimum at 15:00. In conditions comprising either prolonged day or
prolonged night, plantlets appeared to maintain rhythmicity of
competence for PT and GT at least in the short-term. Introduction of a
dark period prior to the tropic stimulation at 11:00 h when both PT and
GT responses were strong resulted in the opposite effect: PT was
depressed, and GT was enhanced. There was a time threshold of 60 min for
the duration of the dark period so the plants can sense interruption in
the daylight. Levels of relative expression of a PHOT2 gene indicate
rhythmic daily changes. The PHOT2 gene was present at high levels during
morning hours and late in the evening. As the mid-day and the afternoon
hours approached, PHOT2 expression decreased and reached a daily minimum
at 17:00 h. We believe that our data offer strong support for the
conclusion that there is an involvement of circadian rhythms in control
of both PT and GT.
Напомена:
Erratum in: Journal of Plant Growth Regulation (2015), 34(2): 440-450; https://doi.org/10.1007/s00344-015-9507-8
Кључне речи:
Potato; Phototropism; Gravitropism; Circadian rhythmИзвор:
Journal of Plant Growth Regulation, 2014, 33, 3, 539-550
DOI: 10.1007/s00344-013-9403-z
ISSN: 1435-8107