Research on the evolutionary history of the morphological structure of cotton seeds: a new perspective based on high-resolution micro-CT technology.

Moreover, implications derived from seed coat thickness ratio analysis ( Figure 9B ) showed a low degree of characterization of seed coat thickness ratio among these distinct years, as seen by the mean value ranging between 0.031 and 0.034 showing an increasing trend — that was, the relative thickness of the seed coat increased.

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Through Pearson correlation analysis of 11 phenotypic characteristics of cotton seeds ( Figure 5 ), it revealed a highly significant positive correlation between the volume and surface area of the seed and the volume and surface area of the seed kernel, as well as the volume of the seed coat (r = 0.57~0.83, P < 0.001).

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While the seed coat specific surface area increased initially from 1904-1958 to 1990-2020, it underwent a decreasing trend afterwards, but there was no significant variation in seed coat specific surface area among these generational cohorts.

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