Correlations between net auxin and secondary xylem development in young Populus deltoides

1984 ◽  
Vol 60 (4) ◽  
pp. 459-466 ◽  
Author(s):  
David K. DeGroote ◽  
Philip R. Larson
Keyword(s):  
Populus Deltoides ◽  
Secondary Xylem ◽  
Xylem Development

scholarly journals Auxin‐mediated Aux/ IAA ‐ ARF ‐ HB signaling cascade regulates secondary xylem development in Populus

2019 ◽  
Vol 222 (2) ◽  
pp. 752-767 ◽  
Author(s):  
Changzheng Xu ◽  
Yun Shen ◽  
Fu He ◽  
Xiaokang Fu ◽  
Hong Yu ◽  
...  
Keyword(s):  
Secondary Xylem ◽  
Signaling Cascade ◽  
Xylem Development

Xylary union between elongating lateral branches and the main stem in Populus deltoides

1983 ◽  
Vol 61 (4) ◽  
pp. 1040-1051 ◽  
Author(s):  
Philip R. Larson ◽  
David G. Fisher
Keyword(s):  
Populus Deltoides ◽  
Secondary Xylem ◽  
Cambial Activity ◽  
Main Axis ◽  
Main Stem ◽  
Leaf Trace ◽  
Primary Xylem ◽  
Lateral Bud ◽  
Lateral Branches ◽  
Secondary Vessels

The vasculature of elongating lateral branches was examined to determine how vessels produced in the branch unite with those produced in the main stem axis to form a continuous transport system. In a previous study it was found that differentiation of both primary and secondary xylem in a lateral bud or branch is independent of that in the main axis; i.e., xylem does not differentiate into the bud or branch from the main axis. When serial sections of the nodal region are followed downward, the bud vascular cylinder merges with that of the main axis and the adaxially situated bud traces (those nearest the stem) enter the bud gap margin first. The primary vessels of these bud traces differentiate in an oblique downward path along the margins of the bud gap, and they form radial files of primary vessels that lie adjacent to primary xylem of leaf traces in the stem. Traces situated more abaxially in the bud (those farther from the stem) contribute to other radial files of primary vessels, each of which lies progressively closer to the bud gap. Secondary xylem is initiated in the stem before it is in the branch. Consequently, the last-formed metaxylem vessels of the bud traces are continuous with secondary vessels of the stem. These latter vessels lie in the stem secondary xylem immediately external to primary xylem from the bud. Secondary xylem in the branch is initiated when foliage leaves and internodes mature. Secondary vessels formed in the branch traces are continuous with secondary vessels in the stem; these vessels are embedded in a matrix of fibers. Because cambial activity is more vigorous in the stem than in the branch, two vessels that are radially adjacent in the branch may be widely separated by fibers in the stem. The central trace of the axillant leaf enters the gap immediately below the last branch traces; at this level in the stem the leaf trace vasculature is entirely primary. The stem secondary xylem that overlies the leaf trace is continuous with that in the axillary branch.

scholarly journals Brassinosteroids promote parenchyma cell and secondary xylem development in sugar beet ( Beta vulgaris L.) root

Plant Direct ◽  
2021 ◽  
Vol 5 (10) ◽  
Author(s):  
Wei Wang ◽  
Yaqing Sun ◽  
Guolong Li ◽  
Shaoying Zhang
Keyword(s):  
Sugar Beet ◽  
Beta Vulgaris ◽  
Secondary Xylem ◽  
Parenchyma Cell ◽  
Xylem Development

Secondary xylem development in Arabidopsis : a model for wood formation

2002 ◽  
Vol 114 (4) ◽  
pp. 594-600 ◽  
Author(s):  
Nigel Chaffey ◽  
Ewa Cholewa ◽  
Sharon Regan ◽  
Björn Sundberg
Keyword(s):  
Secondary Xylem ◽  
Wood Formation ◽  
Xylem Development

scholarly journals A Small Guanosine Triphosphate Binding Protein PagRabE1b Promotes Xylem Development in Poplar

2021 ◽  
Vol 12 ◽  
Author(s):  
Ying-Li Liu ◽  
Li-Juan Wang ◽  
Yu Li ◽  
Ying-Hua Guo ◽  
Yuan Cao ◽  
...  
Keyword(s):  
Secondary Xylem ◽  
Rab Gtpases ◽  
Biological Processes ◽  
Flow Cytometry Analysis ◽  
Wild Type ◽  
Functional Identification ◽  
Guanosine Triphosphate ◽  
Positive Role ◽  
Xylem Development ◽  
Reverse Transcription Pcr

Rab GTPases are the subfamily of the small guanosine triphosphate (GTP)-binding proteins which participated in the regulation of various biological processes. Recent studies have found that plant Rabs play some specific functions. However, the functions of Rabs in xylem development in trees remain unclear. In this study, functional identification of PagRabE1b in Populus was performed. Quantitative reverse transcription PCR (qRT-PCR) results showed that PagRabE1b was highly accumulated in stems, especially in phloem and xylem tissues. Overexpression of PagRabE1b in poplar enhanced programmed cell death (PCD) and increased the growth rate and the secondary cell wall (SCW) thickness. Quantitative analysis of monosaccharide content showed that various monosaccharides were significantly increased in secondary xylem tissues of the overexpressed lines. Flow cytometry analysis revealed that the number of apoptotic cells in PagRabE1b-OE lines is more than a wild type (WT), which indicated that PagRabE1b may play an important role in PCD. Further studies showed that overexpression of PagRabE1b increased the expression level of genes involved in SCW biosynthesis, PCD, and autophagy. Collectively, the results suggest that PagRabE1b plays a positive role in promoting the xylem development of poplar.

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