scholarly journals Phloem: Cell Types, Structure, and Commercial Uses

2020 ◽  
Author(s):  
Marcelo R. Pace
Keyword(s):  
Cell Types ◽  
Phloem Cell

The Anatomy of the Bark of Libocedrus in New Zealand

IAWA Journal ◽  
1985 ◽  
Vol 6 (1) ◽  
pp. 23-34 ◽  
Author(s):  
Lek-Lim Chan
Keyword(s):  
New Zealand ◽  
Cell Types ◽  
Phloem Cell ◽  
Sieve Cells ◽  
Ray Parenchyma ◽  
Thin Walled

The anatomy of the bark of Libocedrus bidwillii and L. plumosa, both indigenous to New Zealand, is described. The phloem cell types include axial and ray parenchyma, sieve cells and fibres. Fibres are of two types, thin-walled and thick-walled. The ends of these fibres are mostly blunt or abrupt.

scholarly journals Callose accumulation in specific phloem cell types reduces axillary bud growth in Arabidopsis thaliana

2021 ◽  
Author(s):  
Andrea Paterlini ◽  
Delfi Dorussen ◽  
Franziska Fichtner ◽  
Martin Rongen ◽  
Ruth Delacruz ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Types ◽  
Axillary Bud ◽  
Phloem Cell ◽  
Bud Growth ◽  
Axillary Bud Growth

scholarly journals Blocking plasmodesmata in specific phloem cell types reduces axillary bud growth in Arabidopsis thaliana

2020 ◽  
Author(s):  
Andrea Paterlini ◽  
Delfi Dorussen ◽  
Franziska Fichtner ◽  
Martin van Rongen ◽  
Ruth Delacruz ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plant Architecture ◽  
Plant Cells ◽  
Cell Types ◽  
Phloem Cell ◽  
Companion Cells ◽  
Axillary Meristems ◽  
Bud Growth ◽  
Axillary Bud Growth ◽  
Developmental Switch

AbstractThe plasticity of above ground plant architecture depends on the regulated re-activation and growth of axillary meristems laid down in the axils of leaves along the stem, which often arrest as dormant buds. Plasmodesmata connecting plant cells might control the movement of regulators involved in this developmental switch. Constructs capable of occluding these structures were employed in phloem cell types, because of the importance of phloem in local and systemic trafficking. We show that over-accumulation of callose within companion cells of the Arabidopsis inflorescence reduces the growth rates of activated buds, but does not affect bud activation. Growth rate reductions were not dependent on the phloem-mobile strigolactone receptor, which regulates bud activation. Furthermore, there was no correlation with early bud sugar profiles, which can also affect bud activity and depend on phloem-mediated delivery. It is therefore possible that an as yet unknown mobile signal is involved in modulating branch growth rate.

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