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SEED VIABILITY LEVEL OF MAIZE GENEPOOL ACCESSIONS AFTER LONG-TERM STORAGE

SEED VIABILITY LEVEL OF MAIZE GENEPOOL ACCESSIONS AFTER LONG-TERM STORAGE

Institution

Section

PLANT GENETIC RESOURCES CONSERVATION

Abstract

Monitored seed germination of maize (Zea mays L.) subspecies everta, indurate, indentata, semindentata, saсcharata. Z. mays subsp.everta seed storage at 7-8 % moisture content and unregulated temperature does not decrease seed germination during 8-9 years. Most accessions of Z. mays subsp. indurate, indentata seeds, at 6,5-8,0 % moisture content,  unregulated temperature conditions does not decrease germination for 10 years or longer. Z. mays subsp. semindentata seeds accessions at 6,9-7,9 % moisture content,  uncontrolled and positive low temperatureare does not decreased seed viability during 10 years storage. Z. mays subsp. saccharata accessions seeds at moisture content 6,5-7,5 %  does not decrease germination during 5-7 storage years.  Long-term seed storage is not recommended for Z. mays subsp. semindentata and saсcharata at moisture content higher then 8 %. Maize seeds under long-term storage increases viability in all subspecies to 25 % in some cases. Most often, such increasing was observed at low positive or negative temperatures. Seed maize varieties showed no benefits in greater capacity for storage then seed maize lines. Monitoring results of seed viability for Z. mays subsp. everta, indurate, indentata, semindentata, saccharata which stored at regular conditions showed a satisfactory viability level for seeds stored during 5-17 years, at 6-8 % moisture content in airtight containers. 

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