Co-Authors:
Szafran, E., Institute of Horticulture, Agricultural Research Organization, Volcani Center, P.O. Box 6, 50 250 Bet Dagan, Israel, Department of Life Science, Bar-Ilan University, Ramat Gan, Israel
David, I., Institute of Horticulture, Agricultural Research Organization, Volcani Center, P.O. Box 6, 50 250 Bet Dagan, Israel
Zilkah, S., Institute of Horticulture, Agricultural Research Organization, Volcani Center, P.O. Box 6, 50 250 Bet Dagan, Israel
Abstract:
The objective of the present study was to elicit stress responses in flower buds of 'AprilGlo' nectarine by water and temperature stress treatments, and to evaluate five potential stress indicators for quantifying the stress status in tissue. The flower bud abscission force gradually increased as the bud development proceeded. The bud abscission force of the drought-stressed trees was significantly lower than that under either the standard or the excess irrigation regime; it was also significantly dependent on the external temperature conditions. Free proline concentration in open flowers increased in response to deficit or excess stress irrigation; it also responded distinctively to low or high temperature. Nitrate reductase activity increased following deficit or excess irrigation stress. Water content of open flowers was not influenced by the previous season's irrigation stress. Photosystem II fluorescence of first expanded apical leaves decreased significantly, in a season-dependent manner, following either excess or deficit irrigation regimes. The intra-indicator types correlation was less significant following either deficit or excess water stress than following standard irrigation. It seems that except for the water content, the investigated indicators could reflect the physiological stress status prevailing in the tissue at the time of measurement. Combinations of different indicators might be needed to reliably quantify the overall condition of the reproductive organs.
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