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OILSEEDS STORAGE UNDER CONTROLLED CONDITIONS

Institution

Section

Plant genetic resources conservation

Abstract

Goal. To determine optimal regimens for storage of the following oil crop accessions on the basis of the monitoring results on the seed status under controlled storage conditions: common sunflower, winter and spring rape, brown and black mustard, opium poppy, false flax, upland cotton, peanut, castor bean, Indian sesame, arugula, perilla, chufa sedge, lallemantia, oil radish, turnip rape, safflower.

Results and Discussion. Based on to the monitoring results on oilseeds- 12 sunflower accessions, 15 winter and spring rape accessions, seven brown and black mustard accessions, 12 opium poppy accessions, 6 false flax accessions, 3 safflower accessions, 2 accessions of oil radish, 2 upland cotton accessions, 1 accession of each of the following plants: peanut, castor bean, Indian sesame, arugula, perilla, chufa sedge, lallemantia, and turnip rape, which were stored in hermitically sealed containers under controlled conditions, at 4oC, or at -20oC - optimum moisture levels in seeds were determined. To maintain the viability of seeds on high levels, the moisture content in seeds should be: for common sunflower - 2-4.5 % during 9-15 years; for winter and spring rape - 2.5-3.7 % during 5-18 years; for brown and black mustard – 2.5-3.7 % during 4-12 years; for  opium poppy ­ 2.4-3.6 % during 4 years; and for safflower - 2.4-2.9%, during 5-10 years. At -20oC the germination capacity of seeds remains unchanged for at least 5 years with the following values of moisture content: for false flax ­ 2-4 %, for lallemantia - 2.6 %; for peanut – 3.1 %; for castor bean ­ 3.8%; for arugula, chufa sedge, Indian sesame, oil radish, perilla, turnip rape below - <4 %. It was established that in the depository with non-regulated temperature the germination capacity of common sunflower seeds with 2.5-3.7 % moisture content remained unchanged for only 4 years. Then we observed a gradual reduction in it. Seeds of the oil crop cultivars studied had no advantages upon storage in comparison with seeds of lines of the same crops. Seeds of accessions grown in places with heavier precipitation had worse indexes of germination after long-term storage.

            Conclusions. Based on to the monitoring results on the status of oilseeds after long-term storage under controlled conditions, optimal regimens for storage of a number of oil crops were determined. High levels of the viability of oilseeds were preserved, when seeds were stored with the moisture content of < 4.5 % at -20oC or at 4oC. 

Keywords

oil crops, seeds, storage, moisture content, temperature, genebank