Parvin Rokhfrooz; Mohammad Farzam; Mohammad KhajeHoseini
Volume 27, Issue 1 , April 2020, , Pages 75-83
Abstract
Times and methods of seed harvesting and seed storage have important effects on seedling viability and establishment. Effects of seed harvesting times and storage duration were tested on seed germination of Krashninkoviaceratoides in the Shahrak-Imam Seed Production Station in Neyshabur Iran. Experiment ...
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Times and methods of seed harvesting and seed storage have important effects on seedling viability and establishment. Effects of seed harvesting times and storage duration were tested on seed germination of Krashninkoviaceratoides in the Shahrak-Imam Seed Production Station in Neyshabur Iran. Experiment treatments were: 1) two methods of cultivation for seed producing stands (rainfed or irrigation), 2) two methods of seed storage (cold room and normal condition), 3) seed scarification and coat removal in 6 times of seed harvesting, and 8 periods of seed storage. All treatments were designed as three independent experiments, and statistical analysis were performed accordingly. For each experiment, four replicates (25 seeds each) were located in a germinator with 14:10 hours light and dark periods. Methods of seed storage (cold room or ambient) did not affected seed germination rate. Rainfed grown stands led to higher germination percent as compared to those growing under irrigation. Seed coat removing significantly reduced germination rate. Under both cold and ambient storage conditions, seed germination rates did not significantly change till 242 days after harvesting; it gradually reduced and reached to zero at 271 days after seed harvest. According to the results of this research, the best time for seed collection is early October, seeds do not need coat removing or cold treatments, as they are able to germinate till 6 months after the ripening stage under the normal room storage conditions.
Sepedeh Anvarkhah; Mohammad Khaje hoseini; Mohammad Jangju
Volume 18, Issue 1 , May 2011, , Pages 71-89
Abstract
Seed dispersal distances of mother plant is a basic aspect in plant life history, and have great effects on plant ecology, evolution and conservation. Seed dispersal modes of species can often be recognized by morphological characteristics of fruits and seeds. A laboratory experiment was conducted ...
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Seed dispersal distances of mother plant is a basic aspect in plant life history, and have great effects on plant ecology, evolution and conservation. Seed dispersal modes of species can often be recognized by morphological characteristics of fruits and seeds. A laboratory experiment was conducted on seeds of 24 Northern Khorasan rangeland species during 2008. The size of seeds was measured by digital caliper with a precision of .0.01 mm (operating instruction in resolution 0.01 mm), and the seeds' shape were observed by binocular and drown by hand in scale of 30-80 times. Seeds were categorized in five categories based on their shapes and morphological traits namely, Nutrient Containing Structure (i.e. Artemisia seiber), Balloon Structure (i.e. Agropyron trichophorum),Elongated Appendages (ie. Salsola arbusculaformis), No Appendages (i.e. Stachys inflate and Iris songarica) and other Specializations (i.e. Kochia prostrate). According to the results, balloon structure category was identified as the most common seed dispersal mode in the zone of Northern Khorasan (with 9 species) which let the wind disperses the seeds easily. The elongated appendages category was placed in the next group and other categories owned third place. It can be concluded that balloon structure has provided the most suitable dispersal system for the seeds studied in Northern Khorasan rangeland