Publications by authors named "Pei-Hua Gan"
Article Synopsis
- - The study focuses on the inverted cuttings of *Populus yunnanensis*, which exhibit larger stems and smaller new shoots, and highlights the role of phytohormones, specifically the polar auxin transport (PAT) system, in this response.
- - A genome-wide analysis identified three gene families related to auxin transport in different *Populus* species: PIN (15 genes), AUX/LAX (8 genes), and ABCB (31 genes), with transcriptome profiling suggesting that most PAT genes do not react significantly to cutting inversion, except for a few.
- - Four specific PAT genes (PyuPIN10, PyuPIN11, PyuLAX6, PyuABCB27) showed
Inverted cuttings of exhibit an interesting growth response to inversion. This response is characterized by enlargement of the stem above the shoot site, while the upright stem shows obvious outward growth below the shoot site. In this study, we examined transcriptome changes in bark tissue at four positions on upright and inverted cuttings of : position B, the upper portion of the stem; position C, the lower portion of the stem; position D, the bottom of new growth; and position E, the top of new growth.
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- Inverted cuttings of plants survive by rooting from the top and sprouting from the base, but their lateral branches grow less vigorously than upright ones.
- A study revealed that levels of plant hormones like indole-3-acetic acid (IAA) and gibberellic acid (GA₃) were lower in inverted cuttings during the late growth season, while abscisic acid (ABA) levels remained consistent for both types.
- The research also showed that increased activities of certain enzymes involved in cell wall metabolism helped the inverted plants cope with stress, with many differentially expressed genes linked to carbohydrate metabolism.
Methods for constructing trees using DNA sequences, known as molecular phylogenetics, have been applied to analyses of phylogenetic origin, evolutionary relatedness and taxonomic classification. Combining data sequenced in this study and downloaded from GenBank, we sampled 112 (chloroplast data) / 122 (ITS data) specimens belonging to 49 (chloroplast data) / 46 (ITS data) poplar species or hybrids from six (chloroplast data) / five sections (ITS data). Maximum parsimony and Bayesian inference were used to analyze phylogenetic relationships within the genus Populus based on eight chloroplast combinations and ITS regions.
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