Published in Scientific Papers. Series B, Horticulture, Vol. LXVII, Issue 1
Written by Andrei TANASE, Dorin SUMEDREA, Alina FLOREA, Anca ONACHE, Magdalena NEGRU, Mihaela OPREA, Adrian ASĂNICĂ
Chlorophyll fluorescence analysis is one of the modern techniques used to study the effect of stress on the photosynthetic process. In our research, we monitored through periodic determinations the index of chlorophyll, the content of the main parameters of chlorophyll fluorescence and photosynthetic potential, in order to determine the thermal resistance threshold at three varieties of table grapes grown in the Stefanesti, Arges County area. All plants analyzed were subjected to three temperature thresholds: 3.3-7.1ºC, 19.4-21.6ºC and 36.5-43.5ºC (increased heat stress). The 'Argessis’ variety proved to be the most resistant, followed by 'Victoria’, and the 'Augusta’ variety was the most affected by high temperatures, with highly significant positive correlations. Very significant positive correlations were found between OJIP indicators and Phi Do indicator, Pearson correlation values ranging from 0.749 to 0.701. These methods are supportive valuable indicators for establishing the tolerance of table grape varieties to water stress, for tailored irrigation management and for an appropriate choose of resilient varieties in the climate change context.
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