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. 2021 Jul 2;12:698602. doi: 10.3389/fpls.2021.698602

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Copyright © 2021 Li, Chen, Pang, Wang and Dai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Distributions of up- and down-regulated DEGs in the two tree species. (A) Up and down-regulated DEGs in P. alba × P. glandulosa. (B) Up and down-regulated DEGs in L. kaempferi. In both panels, X vs. P represents the differential expression analysis between the xylem and phloem; likewise, X vs. L represents the differential expressed analysis between the xylem and leaf. The vertical dotted lines correspond to the log₂ (fold- change) = ±1, while the horizontal dotted lines are positioned at log₁₀ (Q-value) = ±1.3 (Q-value = 0.05). The genes at the intersection of two groups are the up- and down-regulated genes in xylem tissue.