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| Study on Fruit Mechanical Properties and Peel Structure during Development of Watermelon with Different Crack Tolerance |
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| DOI：10.16768/j.issn.1004-874X.2020.10.003 |
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| Abstract: |
| 【Objective】The study was conducted to understand the mechanical properties of fruits and the changes of peel structure during the development of watermelon with crack tolerance and crack sensitive watermelon and reveal the relationship between watermelon crack tolerance and peel structure and fruit physical properties, providing a theoretical basis for the breeding of watermelon with crack tolerance.【Method】Taking crack tolerant germplasm S1111 and crack sensitive germplasm 201609019 as test materials, fruit hardness and crack stress at different development stages were analyzed by texture analyzer. The structure of peel structure was observed histologically by paraffin sectioning.【Result】In
the process of fruit development, the fruit hardness and crack stress of S1111 were 1.35-1.54 times and 1.85-6.03 times those of 201609019, respectively, with significant differences. Histological observation showed that there were obvious differences between the peel structures of S1111 and 201609019, The peel cells of S1111 were closely arranged with obvious sclerenchyma structure. The peel thickness and exocarp thickness of S1111 were significantly higher than those of 201609019. While the epidermal cells of 201609019 were longer, exocarp cells and mesocarp cells were larger, and the cell area was significantly larger than that of S1111, and the areas of exocarp cells and mesocarp cells were 1.67-3.28 times and 2.77-5.69 times those of S1111 respectively. Correlation analysis showed that fruit hardness and fruit crack stress were significantly positively correlated with peel thickness and exocarp thickness, but negatively correlated with epidermal cell length, exocarp cell area and mesocarp cell area.【Conclusion】The analysis on fruit hardness, fruit crack stress and peel structure of watermelon showed that the
crack stress and fruit hardness could be used to evaluate the crack tolerance of watermelon fruit, and it was more appropriate to
evaluate the fruit at the later development stage. |
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