A higher sink competitiveness of the rooting zone and invertases are involved in dark stimulation of adventitious root formation in Petunia hybrida cuttings

Plant Science : an International Journal of Experimental Plant Biology
Yvonne KlopotekUwe Druege

Abstract

The contribution of carbon assimilation and allocation and of invertases to the stimulation of adventitious root formation in response to a dark pre-exposure of petunia cuttings was investigated, considering the rooting zone (stem base) and the shoot apex as competing sinks. Dark exposure had no effect on photosynthesis and dark respiration during the subsequent light period, but promoted dry matter partitioning to the roots. Under darkness, higher activities of cytosolic and vacuolar invertases were maintained in both tissues when compared to cuttings under light. This was partially associated with higher RNA levels of respective genes. However, activity of cell wall invertases and transcript levels of one cell wall invertase isogene increased specifically in the stem base during the first two days after cutting excision under both light and darkness. During five days after excision, RNA accumulation of four invertase genes indicated preferential expression in the stem base compared to the apex. Darkness shifted the balance of expression of one cytosolic and two vacuolar invertase genes towards the stem base. The results indicate that dark exposure before planting enhances the carbon sink competitiveness of the rooting zone an...Continue Reading

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Citations

Apr 12, 2016·Frontiers in Plant Science·Uwe DruegeMohammad R Hajirezaei
Dec 24, 2018·International Journal of Molecular Sciences·Long-Bin ShenYan Yang
Oct 6, 2020·Frontiers in Plant Science·Sanaria AlallaqCatherine Bellini
Jan 20, 2021·Plant, Cell & Environment·Aurora Alaguero-CordovillaJosé Manuel Pérez-Pérez
Nov 15, 2020·Plants·Jesús M VielbaConchi Sánchez
Jun 8, 2021·Frontiers in Plant Science·Florencia Bannoud, Catherine Bellini

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