Pre-harvest sprouting is a major physiological problem in rice caused by prolonged rainfall and high humidity during the harvest period, and it is one of the most important targets in current rice breeding programs. In this study, the effect of cold and freezing storage on the pre-harvest sprouting rate was investigated using ten rice varieties under four different treatments. The result showed storage treatments of panicle samples used for germinate evaluation had no significant influence on the pre-harvest sprouting rate. These findings may enhance the efficiency of mass screening for pre-harvest sprouting and support the development of tolerant rice varieties.

Endodormancy is a key determinant of cold and freezing hardiness in plant cycles. Short plant growth periods and increasing frequencies of frosting caused by increasing temperatures are major environmental challenges faced by trees in arid areas of central Mongolia. In the present study, the primary aim was to determine an effective method for cold hardiness with the use of six introduced and two Mongolian poplar clones. The secondary aim was selecting clones suitable for afforestation in Mongolia. Year old branches were subjected to four temperature treatments to induce cold hardiness. Electrolyte leakage, 2,3,5-triphenyltetrazolium chloride (TTC) reduction, leaf sprouting, and leaf browning rates were compared. High rates of electrolyte leakage and browning rates were observed along with low leaf sprouting at a low-temperature of ‒30°C. Temperatures between ‒25°C and ‒30°C damaged certain clones more than others. TTC reduction rate method for determining cold hardiness was considered effective in this case. In addition, Mongolian poplar P. sibirica differed distinctly from other poplar clones owing to the difference in dormancy-breaking whereas DN 247 and DN sim were better adapted to cold hardiness based on TTC reduction rate. These findings suggest that factors such as plant dormancy depth and physiological differences might significantly affect productivity and performance among plants. Evidently, further studies are required using other plant parts for selecting suitable poplar clones.

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• Response of citrus to freezing tolerance differs depending on genotypes and growing conditions
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• Standardization of electrolyte leakage data and a novel liquid nitrogen control improve measurements of cold hardiness in woody tissue
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Winter apple buds germplasm was cryopreserved in the Korean Genebank to back up the genetic resources maintained by field collections. We examined the standard two-step freezing protocol for the cryopreservation of winter buds of apple germplasm developed by National Center for Genetic Resources Preservation (NCGRP) in the USA. This protocol requires desiccation of the stem explants containing a single dormant bud to 30% moisture content, cooling at a rate of 1°C/h to −30°C for 24 hours, followed by rapid immersion in liquid nitrogen. To evaluate the viability of cryopreserved buds after at least 24 hours, the thawed and rehydrated segments are transferred to a greenhouse and used for vegetative propagation by chip budding onto rootstock or by in vitro sprouting. To optimize the protocol for the cryopreservation of winter-dormant apple buds suitable for Korean climate, we tested several treatments, including different degrees of desiccation, pre-freezing temperatures, and pre-freezing rates. The highest regeneration rates were obtained from cryopreserved samples with 35% moisture content, −35°C pre-freezing temperature, and 1°C/h pre-freezing rate. Finally, using our two-step freezing method, 14 accessions of apple germplasm were cryopreserved successfully, with an average regeneration rate of 55.0%.

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• MATHEMATICAL MODEL FOR DESCRIBING THE POST-CRYOPRESERVATION VIABILITY OF FRUIT AND BERRY CUTTINGS
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Grape (Vitis spp.), which is an important economic fruit crop worldwide, is the fourth most common fruit produced in Korea. Low temperature is one of the most important environmental factors that affect the successful cultivation of grapes. To screen for specific expression of abiotic stress-related genes against cold treatment in ‘Campbell Early’ and ‘Muscat Bailey A’ grapevines, the expression of various defense-related genes was investigated by real-time PCR and semi-quantitative RT-PCR. Among 67 genes analyzed by real-time PCR and RT-PCR, 43 and 10 were found to be up-regulated, while 4 and 37 were down-regulated in low temperature treated ‘Campbell Early’ and ‘Muscat Baily A’ grapevines, respectively. Genes encoding cold induced protein (CIP), lipoxygenase (LOX), glutathione S-transferase (GST), polygalacturonase-inhibiting protein (PGIP), and cold acclimation specific protein (CAS15A) were up-regulated, while those encoding cinnamyl alcohol dehydrogenase 2 (CAD2) and cold acclimation protein (WCS120) were down-regulated by low temperature treatment in both ‘Campbell Early’ and ‘Muscat Bailey A’. These changes in gene expression showed that defense response-related genes for cold acclimation were induced and wheat cold-specific gene decreased in grapevines. Among tested genes, the transcript levels of CLP, cell wall protein (CW), TIP, TLP, and WRKY transcription factor 10 (WRKY10) increased considerably in response to low temperature in ‘Campbell Early’ grapevine. These findings suggest that differentially expressed genes could be utilized as candidates for useful genetic resources and molecular markers after additional confirmation in various grapevine cultivars treated with low temperature in breeding programs for grapes with cold-tolerance.

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