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Evaluation of Postharvest Physiological Deterioration （PPD） Resistance and Analysis of Physiological Changes in Cassava Cultivar Xinxuan 048 Inbred Lines
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Affiliation:

1.Guangxi South Subtropical Agricultural Science Research Institute， Chongzuo 532415;2.Cash Crops Research Institute， Guangxi Academy of Agricultural Sciences， Nanning 530007;3.College of Agriculture， Guangxi University， Nanning 530000;4.Institute of Tropical Bioscience and Biotechnology， Chinese Academy of Tropical Agricultural Sciences， Haikou 571101

Fund Project:

Foundation projects： National Key Research and Development Program Project of China （2023YFD1600601）； Guangxi Natural Science Foundation （2024GXNSFBA010406， 2024GXNSFAA010006）； Guangxi Academy of Agricultural Sciences Basic Research Business Special Project （Guinongke 2023YM27， Guinongke 2023YM28， Guinongke 2021YT157）

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    Abstract:

    Postharvest physiological deterioration （PPD） poses a significant constraint to the commercialization of cassava. In this study， we evaluated 166 germplasms from Xinxuan 048 （XX048） inbred cassava line. The degree of tuber decay was assessed at 0， 6， 12， 18， 24 and 30 days postharvest， with corresponding physiological indicators measured. The results showed that X045， X126， X077， X088， and X147 browning occurred later. Notably the browning areas in the five germplasms remained below 10% （PPD Grade 1） by 30 day， indicating superior storage tolerance. In contrast， X024， X062， X085， X100， and X133 showed browning occurred earlier. After 24 days， the browning area in these germplasms exceeded 50%， and reaching 100% （PPD Grade 6） by 30 day， demonstrating their poor storage tolerance. These germplasms can serve as excellent resources for storage tolerance cassava breeding. Starch and dry matter contents are lower in storable germplasms， while β-carotene content is higher. MDA content and antioxidant enzyme （SOD， CAT， POD） activities increase significantly in the late storage phase， and greater increments in non-storable germplasms. Correlation analysis showed that the browning area was positively correlated with dry matter content， starch content and POD enzyme activity， while also showing positive associations with SOD and CAT enzyme activity as well as MDA content. Conversely， a negative correlation was observed with β-carotene content. These results suggest that cassava tubers with high dry matter content and starch content are more susceptible to postharvest decay and exhibit weak PPD resistance. This study provides valuable data for investigating the mechanisms underlying PPD resistance in cassava and supports the breeding of PPD-resistant varieties. The identified germplasms offer a foundation for further research on storage tolerance， PPD resistance mechanisms， and cassava breeding program. These findings hold significant implications for cassava cultivation and postharvest management.

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  • Received:December 14,2024
  • Online: May 29,2025
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