scholarly journals The Leaf and Stem Anatomy of Two Endemic Salvia (Section Salvia, Lamiaceae) from Turkey: S. aucheri subsp. canascens and S. heldrichiana

2021 ◽  
Author(s):  
Gülnur EKŞİ ◽  
Gülderen YILMAZ
Keyword(s):  
Stem Anatomy

Hymenachne acutigluma (Steud.) Gilliland in GBS 20:314 - An exceptionally important perennial grass for anatomy and indigenous practice.

2016 ◽  
Vol 5 (04) ◽  
pp. 4958
Author(s):  
Dulal De
Keyword(s):  
Perennial Grass ◽  
Secondary Growth ◽  
Grass Species ◽  
Stem Anatomy

Hymenachne acutigluma (Steud.) Gilliland, a robust rhizomatous perennial grass spreads on moist and swampy land and also floating in water. Being a grass species, they do not have any cambium for secondary growth. A peculiarity in stem anatomy especially the spongy pith of secondary tissues found in absence of the cambium. The origin and development of the parenchymatous pith tissues has been investigated in the present study. Economically this spongy pith is of very much potent for its high absorbing and filtering capacity and also used as a good fodder.

Brain Stem Anatomy and Surgical Approaches

2019 ◽  
pp. 53-105
Author(s):  
Maximiliano A. Nuñez ◽  
Juan Carlos Fernandez Miranda ◽  
Evandro de Oliveira ◽  
Pablo A. Rubino ◽  
Seclen Voscoboinik ◽  
...  
Keyword(s):  
Brain Stem ◽  
Surgical Approaches ◽  
Stem Anatomy

Structure of the secondary xylem and development of a cambial variant in Serjania mexicana (Sapindaceae)

IAWA Journal ◽  
2021 ◽  
pp. 1-11
Author(s):  
Kishore S. Rajput ◽  
Amit D. Gondaliya ◽  
Roger Moya
Keyword(s):  
Secondary Xylem ◽  
Secondary Growth ◽  
Stem Anatomy ◽  
The Family ◽  
Ray Cells ◽  
Cambial Variant ◽  
Proportional Increase ◽  
Plant Families ◽  
Ray Parenchyma Cells ◽  
Cambial Variants

Abstract The lianas in the family Sapindaceae are known for their unique secondary growth which differs from climbing species in other plant families in terms of their cambial variants. The present study deals with the stem anatomy of self-supporting and lianescent habit, development of phloem wedges, the ontogeny of cambial variants and structure of the secondary xylem in the stems of Serjania mexicana (L.) Willd. Thick stems (15–20 mm) were characterized by the presence of distinct phloem wedges and tangentially wide neo-formed cambial cylinders. As the stem diameter increases, there is a proportional increase in the number of phloem wedges and neo-formed vascular cylinders. The parenchymatous (pericyclic) cells external to phloem wedges that are located on the inner margin of the pericyclic fibres undergo dedifferentiation, become meristematic and form small segments of cambial cylinders. These cambia extend tangentially into wide and large segments of neoformations. Structurally, the secondary xylem and phloem of the neo-formed vascular cylinders remain similar to the derivatives produced by the regular vascular cambium. The secondary xylem is composed of vessels (wide and narrow), fibres, axial and ray parenchyma cells. The occurrence of perforated ray cells is a common feature in both regular and variant xylem.

scholarly journals Investigation of stem anatomy in relation to hydraulic conductance, vegetative growth and yielding potential of ‘Summit’ cherry trees grafted on different rootstock candidates

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tijana Narandžić ◽  
Mirjana Ljubojević ◽  
Jovana Ostojić ◽  
Goran Barać ◽  
Vladislav Ognjanov
Keyword(s):  
Hydraulic Conductivity ◽  
Sweet Cherry ◽  
Correlation Coefficients ◽  
Hydraulic Conductance ◽  
Fruit Production ◽  
Tree Crown ◽  
Stem Anatomy ◽  
Crown Volume ◽  
Cultivar Selection ◽  
Cherry Trees

Abstract Severe climate alterations that seriously challenge fruit production, combined with the demand for healthy, pesticide-free fruits, continuously direct rootstock/cultivar selection towards high adaptable varieties breeding. This study aimed to investigate the rootstocks’ influence on the performance of grafted ‘Summit’ cherry trees, including potentially dwarfing Prunus cerasus, Prunus fruticosa and Prunus mahaleb rootstock candidates. Anatomical properties of rootstock and scion stems were investigated to determine variation among different rootstocks and scion-rootstock combinations and to establish the link between trunk hydraulic conductivity, effective tree crown volume and yielding potential. Cross-section anatomical characteristics varied significantly both in rootstock and scion stems, indicating a clear influence of rootstock genotype on grafted sweet cherry trees. It was observed that all investigated cherry rootstock candidates belong to the low-vigorous rootstocks, based on the estimated effective crown volume of grafted trees compared to ‘Gisela 5’, with values ranging from 0.86 to 2.97 m3 in the fifth year after planting. Results showed a statistically significant positive correlation between trunk hydraulic conductivity, effective tree crown volume and yielding potential, with correlation coefficients up to 0.96. Significantly higher effective crown volume and trunk hydraulic conductance of trees grafted on P. cerasus compared to the trees on control, as well as highest yielding potential, showed better adaptation of these rootstock candidates in the trial without irrigation implemented. It was found that PC_05_04 rootstock candidate could be considered as the most appropriate choice when raising the high-density sweet cherry plantations, due to assessed parameters of vegetative and generative growth.

Stem Anatomy

2011 ◽  
pp. 39-49
Author(s):  
P. Barry Tomlinson ◽  
James W. Horn ◽  
Jack B. Fisher
Keyword(s):  
Stem Anatomy

Testing for Starch, Respiring Tissues, and Vascular Bundles: Inquiry-Based Seed and Stem Anatomy Labs

2002 ◽  
Vol 38 (4) ◽  
pp. 22-27
Author(s):  
Sara Florine ◽  
Paul Hammond ◽  
Katrina Pomart ◽  
Mark Balschweid
Keyword(s):  
Vascular Bundles ◽  
Stem Anatomy

scholarly journals Effects of some plant growth regulators on stem anatomy of radish seedlings grown under saline (NaCl) conditions

2008 ◽  
Vol 54 (No. 10) ◽  
pp. 428-433 ◽  
Author(s):  
K. Çavuşoğlu ◽  
S. Kılıç ◽  
K. Kabar
Keyword(s):  
Growth Regulators ◽  
Vascular Bundle ◽  
Stem Diameter ◽  
Water Medium ◽  
Stem Anatomy ◽  
Cell Width ◽  
Cuticle Thickness ◽  
Epidermis Cell ◽  
Radish Seedlings ◽  
Saline Medium

In this work, effects of gibberellic acid, 2-chloroethylphosphonic acid (ethephon), triacontanol, 24-epibrassinolide and polyamine (cadaverine, putrescine, spermidine, spermine) pretreatments on the stem anatomy of radish seedlings grown under saline conditions were studied. Salt stress decreased the stem diameter, epidermis cell size, cortex zone thickness, vascular bundle width, cambium thickness, xylem width, trachea diameter and phloem width in the seedlings non-pretreated with the growth regulators, in comparison with the control seedlings grown in distilled water medium. In addition, it slightly increased the cuticle thickness. On the other hand, many of the growth regulator pretreatments more or less stimulated the stem diameter, epidermis cell width, cortex zone thickness, vascular bundle width, xylem width, trachea diameter and phloem width in comparison with the control seedlings grown on saline medium. Moreover, they generally reduced the cuticle thickness, epidermis cell length and cambium thickness.

scholarly journals Adventitious Root Formation in Stem Cuttings of Quercus bicolor and Quercus macrocarpa and Its Relationship to Stem Anatomy

2008 ◽  
Vol 133 (4) ◽  
pp. 479-486 ◽  
Author(s):  
J. Naalamle Amissah ◽  
Dominick J. Paolillo ◽  
Nina Bassuk
Keyword(s):  
Secondary Growth ◽  
Adventitious Root Formation ◽  
Fiber Bundles ◽  
Vascular Bundles ◽  
Stem Cuttings ◽  
Root Primordia ◽  
Stem Anatomy ◽  
Indole Butyric Acid ◽  
Quercus Macrocarpa ◽  
Quercus Bicolor

This study investigated the relationship of stem anatomy to differences in rooting ability between Quercus bicolor Wild. and Quercus macrocarpa Michx. cuttings. Quercus bicolor cuttings were found to have a significantly greater proportion of parenchymatous gaps in the sclerenchyma sheath over a 9-week period compared with Q. macrocarpa cuttings. In Q. macrocarpa, the percentage gap was generally low, coinciding with the low percentage rooting observed in this species. Percentage rooting correlated well (r2 = 0.75) with the percentage parenchymatous gap in the perivascular region of Q. bicolor cuttings. The problems with accepting this relationship as causal are stated in the discussion. Untreated cuttings showed normal stem organization: a dermal tissue system that included the initial stages of phellem formation, a cortex, and a ring of closely arranged vascular bundles in early stages of secondary growth. The locations of the five distinct lobes of the pith were coordinated with the locations of root primordia. Callus growth was first detected in the cortex (i.e., external to the fiber bundles), followed by proliferation within the phloem, opposite the lobes of the pith, 8 to 12 days after cuttings were treated with indole butyric acid (6000 mg·L−1 dissolved in 50% v/v ethanol in water). By 14 to 16 days, root primordia had developed within the proliferative tissue in the secondary phloem. In both species, root primordia penetrated parenchymatous gaps in the fiber sheath directly, the fiber bundles being displaced laterally as the roots increased in size.

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