An effect of ethylene on the endoplasmic reticulum of expanding cells of etiolated shoots of Pisum sativum L.

Sargent, John; Osborne, Daphne J.

doi:10.1007/bf00384762

Cited by 13 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both in cortex and pith, ethylene treatment seemed to increase the cytoplasmic density. As previously reported (9,25), the most significant change in cell structure was observed in the RER, which increased markedly in ethylene-treated plants. In addition, dictyosomes were more abundant in treated plants.…”

Section: Influence Of Ethylene On Cell Growthsupporting

confidence: 86%

Modification by Ethylene of the Cell Growth Pattern in Different Tissues of Etiolated Lupine Hypocotyls

Sánchez-Bravo¹,

Ortuño²,

Pérez‐Gilabert³

et al. 1992

Plant Physiol.

View full text Add to dashboard Cite

The influence of ethylene on growth in etiolated lupine (Lupinus albus L.) hypocotyls was studied in ethephon-treated plants. Ethephon reduced the length and increased the diameter of hypocotyls. At the end of the hypocotyl growth period (14 days), the fresh weight was reduced by 53%, and the dry weight was reduced by 16%. Thus, ethylene reduced water uptake in the tissues to a greater extent than the incorporation of new materials. Light microscopic measurements showed that the thickness of tissues was stimulated by ethylene, the vascular cylinder and cortex exhibiting greater increases (55 and 45%, respectively) than pith (26%) or epidermis (12%). Ethephon modified the cell growth pattem, stimulating lateral cell expansion and cell wall thickness, while reducing cell elongation. The response to ethylene varied in the different tissues and was higher in cortex and pith cells than in the epidermis cells. The ethylene-induced cell expansion in the cortex varied according to the localization of cells in the tissue: the central and subepidermal layers showed little change, whereas the innermost layers exhibited the greatest increase. Electron microscopy revealed that ethylene increased both the rough endoplasmic reticulum and dictyosomes, suggesting that ethylene stimulated the secretion of cell wall materials. In untreated seedlings, the pattem of cell growth was similar in cells from the epidermis, cortex, and pith. The final cell size varied along the hypocotyl, the cells becoming shorter and broader the closer to the basal zones of the organ.Several recent studies have confirmed that growth in heterogeneous multicellular systems, such as coleoptiles or hypocotyls, involves the cooperation of functionally different tissues (7,8,18,19 morphometric studies showed that variations in cell growth rate as well as in cell wall thickness correlated with the variations of IAA content during lupine hypocotyl growth ( 13,14,23). These results suggest the participation of IAA in the control of cell growth in lupine hypocotyls.In addition to IAA, the influence of ethylene in the growth of stems is widely documented (for reviews, see refs. 1, 3, 15-17, and 21). Cell growth response to ethylene depends on the type of cell ( 16) as well as the cell's sensitivity to ethylene ( 12,15,21). Although some data suggest that cell responsiveness to ethylene could be mediated by the endogenous level of IAA (15,26), there is little information concerning the role of the different tissues in the ethylene-mediated growth of stems, unlike the case of IAA, which has been extensively studied.In a previous paper, we reported that lupine hypocotyl growth was inhibited by exogenous ACC2 and ethephon, the response being dependent on the concentration, age of the seedlings, and the localization along the hypocotyl (12). In addition, an extensive study showing variations in ethylene production, ACC content, and ethylene-forming enzyme activity during hypocotyl growth was carried out recently (20). From the above, some role for the ethylene ...

show abstract

Section: Influence Of Ethylene On Cell Growthsupporting

confidence: 86%

Modification by Ethylene of the Cell Growth Pattern in Different Tissues of Etiolated Lupine Hypocotyls

Sánchez-Bravo¹,

Ortuño²,

Pérez‐Gilabert³

et al. 1992

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…Jensen & Sicko (1971) showed a 30-fold increase of the ethylene induced RER development in abscission cells of tobacco flower pedicels over that of controls 5 h after exposure. Similar effects were noted by Sargent &Osborne (1975), andOsborne (1976) in epidermal and cortical cells from the hook region of etiolated pea seedlings exposed to ethylene. They proposed that ethylene stabilized or reorganized, rather than proliferated the RER.…”

Section: Discussionsupporting

confidence: 75%

Ultrastructural effects of formulated picloram on leaflets of velvet mesquite and catclaw acacia*

1979

View full text Add to dashboard Cite

Summary: The effects of picloram formulated with a nonionic surfactant (X‐77) and of the surfactant alone on the ultrastructure of leaf cells of velvet mesquite (Prosopis velutina Woot.) and catclaw [Acacia greggii var. ariznica (Gray) Isely] were examined The surfactant induced temporary protrusions from chloroplasts in both species. A proliferation of rough endoplasmic reticulum (RER) was noted in velvet mesquite within 8h of application of the herbicide and in catclaw with in 27 h. By 72h after treatment. both species exhibited distortions of organelles with more severe symptoms in catclaw. the species more sensitive to the herbicide Leaf abscission occurred subsequently and was more pronounced in catclaw than in mesquitel It is known that RER proliferation is induced by ethylene and that ethylene evolution is stimulated by picloram. The present study suggests that the interaction between these two chemicals was similar in the two plant species studied.

show abstract

“…A similar effect has been described for ethylene in other plant materials (Sargent and Osborne 1975;Liebermas et al 1983;Sa´nchez Bravo et al 1992).…”

Section: Morphological and Ultrastructural Changes In Cell Suspensionsupporting

confidence: 63%

Ultrastructural changes and diosgenin content in cell suspensions of Trigonella foenum-graecum L. by ethylene treatment

2004

View full text Add to dashboard Cite

This paper studies the effect of different concentrations of ethephon (an ethylene releasing compound) on the level of the steroidal sapogenin diosgenin in cell suspensions of Trigonella foenum-graecum L. The results reveal that diosgenin synthesis and/or accumulation was stimulated by 5 ppm ethephon treatment, an increase of 126% being observed, while concentrations of 25 ppm and 50 ppm reduced the levels of this secondary compound. Changes in the isopentenyl diphosphate isomerase activity, increased cell diameter, decreased cell packing (with all the ethephon concentrations assayed), increased cytoplasmic density (5 ppm ethephon treatment) and alterations in the membrane structures (25 and 50 ppm ethephon treatments) were also observed.

show abstract

An effect of ethylene on the endoplasmic reticulum of expanding cells of etiolated shoots of Pisum sativum L.

Cited by 13 publications

References 16 publications

Modification by Ethylene of the Cell Growth Pattern in Different Tissues of Etiolated Lupine Hypocotyls

Modification by Ethylene of the Cell Growth Pattern in Different Tissues of Etiolated Lupine Hypocotyls

Ultrastructural effects of formulated picloram on leaflets of velvet mesquite and catclaw acacia*

Ultrastructural changes and diosgenin content in cell suspensions of Trigonella foenum-graecum L. by ethylene treatment

Contact Info

Product

Resources

About