• Title/Summary/Keyword: seed viability equation

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Analysis of Seed Storage Data and Longevity for Agastache rugosa (배초향 (Agastache rugosa) 종자의 저장 반응과 수명 분석)

  • Lee, Mi Hyun;Hong, Sun Hee;Na, Chae Sun;Kim, Jeong Gyu;Kim, Tae Wan;Lee, Yong Ho
    • Korean Journal of Environmental Biology
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    • v.35 no.2
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    • pp.207-214
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    • 2017
  • There is little information about the seed longevity of wild plants, although seed bank storage is an important tool for biodiversity conservation. This study was conducted to predict the seed viability equation of Agastache rugosa. The A. rugosa seeds were stored at moisture contents ranging from 2.7 to 12.5%, and temperatures between 10 and $50^{\circ}C$. Viability data were fitted to the seed viability equation in a one step and two step approach. The A. rugosa seeds showed orthodox seed storage behaviour. The viability constants were $K_E=6.9297$, $C_W=4.2551$ $C_H=0.0329$, and $C_Q=0.00048$. The P85 of A. rugosa seeds was predicted to 152 years under standard seed bank conditions. The P85 predicted by seed viability equation can be used as basic information for optimization of seed storage processes.

Seed Longevity of Rice Germplasm in the National Agrobiodiversity Center (종자은행 보존 벼 유전자원의 생태형별 종자수명)

  • Na, Young-Wang;Choi, Yu-Mi;Baek, Hyung-Jin;Lee, Sok-Young;Kang, Jung-Hun;Kim, Seok-Hyeon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.59 no.3
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    • pp.216-222
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    • 2014
  • The purpose of this study was to know the seed longevity of rice (Oryza sativa L.) germplasm for effective viability monitoring. The longevity was determined via germination tests of 3,066 accessions of rice germplasm from the National Agrobiodiversity Center, Rural Development Administration, Korea. The rice germplasm accessions have been conserved at a mid-term storage ($4^{\circ}C$, 30% RH) in plastic bottle containing dehydrated (blue) silica-gel and long-term storage ($-18^{\circ}C$, 35% RH) in hermetically sealed metal can on either sides for 25~26.5 years. The final germination percentages of 3,066 rice germplasm accessions of $6.5{\pm}1.0%$ seed moisture content with 94% initial germination stored at $4^{\circ}C$ for 26.5 years declined to 47% while at $-18^{\circ}C$ for 25 years maintained high germinability as 93%. Germination time courses, which represent the average performance of rice ecotypes stored at $4^{\circ}C$ and 30% RH, were fitted regression equation, to calculate the time at which germination characteristically declined to 50% ($P_{50}$). These $P_{50}$ values of Indica, Japonica, Javanica and Tongil type in rice were 39.9, 22.9, 25.4 and 31.8 years, respectively. The rice germplasm stored at $4^{\circ}C$ could be clustered in 4 groups using quartile of final germination after 26.5 years storage. The seed longevity ($P_{50}$) of each group was estimated by regression equation of changed germination percentages according to storage periods. The $P_{50}$ values of group I, group II, group III and group IV were 21.1, 23.6, 30.0 and 75.7 years.