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Journal ArticleDOI

Cytochalasin stops tip growth in plants

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TLDR
Heraeus and Shren as discussed by the authors used Zygophyllum coccineum to construct a terpapier for the first time in 1970, which was used for the Hebrew Bible.
Abstract
Th ioha rns to f f w i rk t bei v ie len S a m e n k e i m u n g s f 6 r d e r n d [1]. Bei pos i t iv pho tob l a s t i s chen S amen k a n n er oft das L i ch t erse tzen, so dab S a m e n anch i m D u n k e l n ke i men [2]. Bei den n e g a t i v pho tob l a s t i s chen S a m e n yon Phacelia h e m m t Thioha rns to f f die K e i m u n g i m D u n k e l n s chwach u n d verst&rkt die 1 4 e i m n n g s h e m m u n g du rch L ich t [3]. Hier wird yon einer f6 rde rnden W i r k u n g auf die L i c h t k e i m u n g der nega t iv pho to b las t i schen [4] S a m e n von Zygophyllum coccineum L. ber ichter . Die S a m e n w u r d e n in W a d i Hof in der &gypt isch-arabischen Wi i s te im Sep tember 1970 ge sammel t . Zur K e i m u n g k a m e n sie bei 25 ~ in Pe t r i scha len (50 S a m e n pro Schale) auf eine Lage Fi l terpapier , die m i t 5 ml dest. W a s s e r oder der T h i o h a r n s t o f f L 6 s u n g getr&nkt war. Be l ich te t wurde mi t We ig l i ch t in e inem L i c h t s c h r a n k ( K I ( B 600L der Fa. Heraeus , H a n a u ; Leuch ts to f f rShren , Licht intensi t~i t in H6he d e r Schalen ca. 2 0 0 0 L u x ) . Jeder Ansa t z wurde 6fach durchgef t ih r t u n d die Ergebnisse gemi t te l t . Der P rozen t s a t z der geke imten S a m e n wurde fiber 7 Tage in 24s t f ind igem A b s t a n d festgestel l t , wobei als geke imt S a m e n gal ten, deren Ke imwurze l eben s i ch tba r geworden war. A m E n d e des Versuchs w u r d e die L~nge des H y p o c o t y l s und der Wurze l ermi t t e l t .

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Journal ArticleDOI

Latrunculin B Has Different Effects on Pollen Germination and Tube Growth

TL;DR: It is postulated that germination is less sensitive to LATB than tube extension because of the presence of a small population of LATB-sensitive actin filaments, which is critical for maintenance of tip growth but not for germination of pollen, or because germination has been lesssensitive to partial depolymerization of the actin cytoskeleton.
Journal ArticleDOI

The chemistry and biology of cytochalasans.

TL;DR: This review provides an overview on the structural diversity, biological activities, biosynthesis and synthesis of cytochalasans (or cy tochalasins) up to the end of 2009.
Journal ArticleDOI

Signaling to the actin cytoskeleton in plants

TL;DR: This review focuses on five different cellular responses in which the actin cytoskeleton redistributes following extracellular stimulation: pollen tube tip growth and the self-incompatibility response; root hair responses to bacterial nodulation factors; light-mediated plastid positioning; nonhost resistance to fungal attack; and guard cell shape and turgor changes.
Journal ArticleDOI

Ultrastructure of the cytoskeleton in freeze-substituted pollen tubes ofNicotiana alata

TL;DR: The ultrastructure of the cytoskeleton in Nicotiana alata pollen tubes grownin vitro has been examined after rapid freeze fixation and freeze substitution and it is suggested that they are composed of actin and are responsible for generating the vigorous cytoplasmic streaming characteristic of living pollen tubes.
Book ChapterDOI

Cell-wall synthesis in apical hyphal growth

TL;DR: This chapter discusses the cell wall synthesis in apical hyphal growth and reveals a cytoskeletal organization of the cytoplasm at the apex, which may be crucial to its polarized activity.
References
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Journal ArticleDOI

Microfilaments in Cellular and Developmental Processes

TL;DR: The overall conclusion is that a broad spectrum of cellular and developmental processes are caused by contractile apparatuses that have at least the common feature of being sensitive to cytochalasin.
Journal ArticleDOI

Ultrastructure and function of growth cones and axons of cultured nerve cells

TL;DR: Dorsal root ganglion nerve cells undergoing axon elongation in vitro have been analyzed ultrastructurally and it is suggested that this filamentous network could provide the structural basis for the initiation of lateral microspikes and perhaps of collateral axons, besides playing a role in axonal transport.
Journal ArticleDOI

Isolation and characterization of secretory vesicles in germinated pollen of Lilium longiflorum.

TL;DR: Ulastructural investigations revealed complexes of the endoplasmic reticulum (ER) associated with electron-translucent regions of cytoplasm, suggesting a possible function of the ER in cell wall formation and patterns of PASH staining show that changes in polysaccharides occur in secretory vesicle after vesicles have been formed by dictyosomes.
Journal ArticleDOI

Ultrastructure and Physiology of Pollen

TL;DR: Pollen offers opportunities and challenges because it is unique among higher plant "tissues" and adds to its value in research on fundamental and universal problems, and some of the special attrib­ utes which pollen presents to the investigator are discussed in this section of the review.
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