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Plant Breeding and Biotechnology Vol.10 No.2.jpg
SCOPUS 학술저널

Development of a Seedling Screening Method for Low-Temperature Tolerance in Pumpkin (Cucurbita moschata) and Selection of the Tolerant Resources for Rootstock of Cucumber

DOI : 10.9787/PBB.2022.10.2.102

Pumpkin (Cucurbita moschata) has been increasingly used as bloomless rootstock for cucumber (Cucumis sativus), butit is sensitive to low-temperature, which is the major bottleneck for winter cultivation. Hence, to develop low-temperature tolerantrootstock varieties, it is needed to identify tolerant germplasm from a wide range of genetic resources. For this, we developed a selectioncriterion for a quick assessment of low-temperature tolerance in pumpkin germplasms from different geographical origins. Weconsidered various indexes for the fast evaluation of low-temperature tolerance, including seedling developmental stage, type ofseedling (excised or non-excised), growth space, etc. Under the testing condition (17℃/7℃, 8 hours light/16 hours dark, 150 μmol m-2s-1light intensity), we found a correlation (r=0.71*) in root growth between 3 weeks-cultured excised seedlings and 6 weeks-culturednon-excised seedlings. Therefore, we extrapolate that excised cotyledonary stage seedling treated for 3 weeks is sufficient todifferentiate the tolerant germplasms. Using this screening method, we identified the “S81015” could prevail low-temperature stress. Further, we tested grafting compatibility and growth of grafted cucumbers under the low-temperature condition to assess the effect ofrootstock and identify low-temperature tolerant and grafting-compatible rootstock germplasm. Upon grafting, we found a highcorrelation (r=0.97**) between the root fresh weight of 6 weeks-cultured non-excised seedlings and the shoot fresh weight of thegrafted cucumbers. In summary, we could identify the low-temperature tolerant pumpkin germplasms by screening at the earlydevelopmental stage. Further, as a rootstock, the tolerant pumpkins also fortified the low-temperature tolerance of grafted cucumbers.

INTRODUCTION

MATERIALS AND METHODS

RESULTS

DISCUSSION

ACKNOWLEDGEMENTS

REFERENCES

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