Co-Authors:
Buskila, Y., Department of Postharvest Science of Fresh Produce, Volcani Center, ARO, Rishon LeZion, Israel, Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Hebrew University of Jerusalem, Robert H. Smith Faculty of Agriculture, Food and Environment, Rehovot, Israel
Sela, N., Department of Plant Pathology and Weed Science, Volcani Center, ARO, Rishon LeZion, Israel
Teper-Bamnolker, P., Department of Postharvest Science of Fresh Produce, Volcani Center, ARO, Rishon LeZion, Israel
Tal, I., George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
Shani, E., George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
Weinstain, R., George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
Gaba, V., Department of Plant Pathology and Weed Science, Volcani Center, ARO, Rishon LeZion, Israel
Tam, Y., Department of Plant Pathology and Weed Science, Volcani Center, ARO, Rishon LeZion, Israel
Lers, A., Department of Postharvest Science of Fresh Produce, Volcani Center, ARO, Rishon LeZion, Israel
Eshel, D., Department of Postharvest Science of Fresh Produce, Volcani Center, ARO, Rishon LeZion, Israel
Abstract:
The potato tuber is a swollen underground stem that can sprout under dark conditions. Sprouting initiates in the tuber apical bud (AP), while lateral buds (LTs) are repressed by apical dominance (AD). Under conditions of lost AD, removal of tuber LTs showed that they partially inhibit AP growth only at the AD stage. Detached buds were inhibited by exogenous application of naphthaleneacetic acid (NAA), whereas 6-benzyladenine (6-BA) and gibberellic acid (GA3) induced bud burst and elongation, respectively. NAA, applied after 6-BA or GA3, nullified the latters' growth-stimulating effect in both the AP and LTs. GA3 applied to the fifth-position LT was transported mainly to the tuber's AP. GA3 treatment also resulted in increased indole-3-acetic acid (IAA) concentration and cis-zeatin O-glucoside in the AP. In a tuber tissue strip that included two or three buds connected by the peripheral vascular system, treatment of a LT with GA3 affected only the AP side of the strip, suggesting that the AP is the strongest sink for GA3, which induces its etiolated elongation. Dipping etiolated sprouts in labeled GA3 showed specific accumulation of the signal in the AP. Transcriptome analysis of GA3's effect showed that genes related to the cell cycle, cell proliferation, and hormone transport are up-regulated in the AP as compared to the LT. Sink demand for metabolites is suggested to support AD in etiolated stem growth by inducing differential gene expression in the AP. © The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissions@oup.com.
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