Effect of pollination time,the hour of daytime,pollen storage temperature and duration on pollen viability,germinability, and fruit set of date palm (Phoenix dactylifera L.) cv "Deglet Nour" |
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Institution: | 1. Laboratory of biotechnology and oasis genetic resources, Regional Center of Research in the Agricultural Oasis of Degache, BP 62, km1 road of Tozeur, 2260 Degache, Tunisia;2. Department of Plant Breeding, Swedish University of Agricultural Sciences, Växtskyddvägen1, P.O. Box 190, SE-234 22 Lomma, Sweden;3. Department of Arid land Agriculture, Faculty of Meteorology, Environment and Arid land Agriculture, King Abdulaziz University, P.O.Box. 80208, Jeddah, Saudi Arabia;4. Pomology Department, Faculty of Agriculture, Mansoura University, El-Mansoura, Egypt |
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Abstract: | Success artificial pollination with viable pollen is crucial process in the production chain of date palms. This study evaluated the impact of pollen storage temperature and duration, pollination time following spathe cracking, and the hour of daytime on pollen viability, germinability, fruit set and yield of 'Deglet Nour' date palm cultivar. In in vitro tests, fresh pollen showed the maximum viability (96.3%) and germination (85%) but it decreased thereafter upon the storage temperature (28, 4 and ?30 °C) and duration (3, 6, 9 and 12 months). In this respect, pollen stored at ?30 °C retained highest viability and germinability followed by those stored at 4 and then at 28 °C. In filed experiments, fruit set was 85, 75, 65, and 45% with pollination using fresh pollen, or pollen stored at ?30, 4 and 28 °C, respectively. Fruit set was 95%, 75%, and less than 50%, for pollination performed on the same day of spathe cracking, 6 and 12 days later, respectively. The highest fruit set percentage and yield/bunch were obtained with pollination performed between 12.0 pm and 15.0 pm in contrast to 8.0–11.0 am or 16.0–17.0. |
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Keywords: | Date palm Pollination Pollen viability Pollen germinability Fruit set Yield |
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