Reversal of glyphosate inhibition of Sandersonia aurantiaca flower senescence with aromatic amino acids

Eason, Jocelyn R.; Johnston, Jason W.; Vré, Leigh de

doi:10.1016/s0925-5214(99)00058-7

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…The content of amino acids increased during leaf senescence, which is considered to may have a role in the initiation of the senescence programme [66] . It was also reported that AAAs are important in the normal process of flower senescence [67] . Thus, the biosynthesis and metabolism of AAAs might play a role in the regulation of leaf senescence through catabolic processes in the chloroplasts, although the detailed experimental data need to be further provided in maize.…”

Section: Resultsmentioning

confidence: 99%

Transcriptional Analyses of Natural Leaf Senescence in Maize

Zhang

et al. 2014

PLoS ONE

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Leaf senescence is an important biological process that contributes to grain yield in crops. To study the molecular mechanisms underlying natural leaf senescence, we harvested three different developmental ear leaves of maize, mature leaves (ML), early senescent leaves (ESL), and later senescent leaves (LSL), and analyzed transcriptional changes using RNA-sequencing. Three sets of data, ESL vs. ML, LSL vs. ML, and LSL vs. ESL, were compared, respectively. In total, 4,552 genes were identified as differentially expressed. Functional classification placed these genes into 18 categories including protein metabolism, transporters, and signal transduction. At the early stage of leaf senescence, genes involved in aromatic amino acids (AAAs) biosynthetic process and transport, cellular polysaccharide biosynthetic process, and the cell wall macromolecule catabolic process, were up-regulated. Whereas, genes involved in amino acid metabolism, transport, apoptosis, and response to stimulus were up-regulated at the late stage of leaf senescence. Further analyses reveals that the transport-related genes at the early stage of leaf senescence potentially take part in enzyme and amino acid transport and the genes upregulated at the late stage are involved in sugar transport, indicating nutrient recycling mainly takes place at the late stage of leaf senescence. Comparison between the data of natural leaf senescence in this study and previously reported data for Arabidopsis implies that the mechanisms of leaf senescence in maize are basically similar to those in Arabidopsis. A comparison of natural and induced leaf senescence in maize was performed. Athough many basic biological processes involved in senescence occur in both types of leaf senescence, 78.07% of differentially expressed genes in natural leaf senescence were not identifiable in induced leaf senescence, suggesting that differences in gene regulatory network may exist between these two leaf senescence programs. Thus, this study provides important information for understanding the mechanism of leaf senescence in maize.

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Section: Resultsmentioning

confidence: 99%

Transcriptional Analyses of Natural Leaf Senescence in Maize

Zhang

et al. 2014

PLoS ONE

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“…is a liliaceous monocotyledon with a bell-shaped corolla formed from fused petals and sepals (tepals). Sandersonia flowers have been used as models for the study of senescence in ethyleneinsensitive floral systems (Eason and Webster, 1995;Eason and de Vré, 1995;Eason et al, 1997Eason et al, , 2000a. The progression of bud appearance, flower opening and senescence in the sandersonia flower proceeds in a manner that provides reliable visual indicators for flower selection.…”

Section: Introductionmentioning

confidence: 99%

“…Pollination does not affect the onset or progression of senescence in sandersonia (JR Eason, personal communication). New protein synthesis, central to the co-ordination of senescence events in sandersonia, is thought to be linked to changes in gene expression that begin prior to the visual symptoms of deterioration (Eason et al, 1997(Eason et al, , 2000a.…”

Section: Introductionmentioning

confidence: 99%

Organization of cell walls in Sandersonia aurantiaca floral tissue

O’Donoghue

Somerfield

Heyes

2002

Journal of Experimental Botany

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Visual symptoms of the onset of senescence in Sandersonia aurantiaca flowers begin with fading of flower colour and wilting of the tissue. When fully senescent, the flowers form a papery shell that remains attached to the plant. The cell walls of these flowers have been examined to determine whether there are wall modifications associated with the late stages of expansion and subsequent senescence-related wilting. Changes in the average molecular size of pectin were limited through flower opening and senescence, although there was a loss of neutral sugar-containing side-branches from pectins in opening flowers, and the total amounts of pectin and cellulose continued to rise in cell walls of fully senescent sandersonia flowers. Xyloglucan endotransglycosylase activity increased in opening and mature flowers, but declined sharply as flowers wilted. Concomitantly, the proportion of hemicellulose polymers of increasing molecular weight increased from flower expansion up to the point at which wilting occurred. Approximately 50% of the non-cellulosic neutral sugar in mature flower cell walls was galactose, primarily located in an insoluble cell wall fraction. Total galactose in this fraction increased per flower with maturity, then declined at the onset of wilting. Beta-galactosidase activity was low in expanding tepals, but increased as flowers matured and wilted.

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“…Glyphosate, mode of action, functions through inhibiting protein biosynthesis, via blocking the activity of a specific enzyme used by plants to make certain important amino acids. Without these amino acids, however, the plant cannot synthesizes proteins required for various life processes, resulting in the death of a plant (Eason et al, 2000;and Cox, 2004). This herbicide has been authorized for uses in ornamental bulbs, in the Netherlands, in the early seventies, according to Rooy and Kosler, 1978, at a recommended rate of 6 L/600 L water/ha, depending on weed sizes.…”

Section: Glyphosatementioning

confidence: 99%

“…However, Glyphosate, mode of action, functions through inhibiting protein biosynthesis, via blocking the activity of a specific enzyme used by plants to make certain important amino acids. Without these amino acids, however, the plant cannot synthesizes proteins required for various life processes, resulting in the death of a plant (Eason et al, 2000;and Cox, 2004. Pendimethalin application at rates ranging from 0.50 to 4.50 kg a. i/ha, resulted in excellent weed control of broad leaves and grassy weeds, and greatly reduced weed population, intensity and dry weights, in many ornamental flowering bulbs and herbaceous perennials, including tuberose (Murthy and Gowda, 1993); Gladiolus (Kwon et al, 1996;Misra, 1997;Sunil-Kumar et al, 2001;Arora et al, 2002;and Richardson and Zandstra, 2006); Tulip (Al-Khatib, 1996); Iris (Ivanova, 1999); and numerous herbaceous perennials (Calkins et al, 1996).…”

Section: Weed Population Density Fresh and Dry Weightsmentioning

confidence: 99%

WEED CONTROL IN FIELD GROWN TUBEROSES (Polianthes tuberosa, L .) CV. ‘DOUBLE’, IN THE WESTERN REGION ARID ZONE OF SAUDI ARABIA: A. WEED POPULATION DENSITY, GROWTH PERFORMANCES AND TUBEROSE CUT FLOWER YIELD, AS FUNCTIONS OF IRRIGATION FREQUENCIES, HAND WEEDING AND HERBICIDES

2007

AJAS

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Reversal of glyphosate inhibition of Sandersonia aurantiaca flower senescence with aromatic amino acids

Cited by 10 publications

References 8 publications

Transcriptional Analyses of Natural Leaf Senescence in Maize

Transcriptional Analyses of Natural Leaf Senescence in Maize

Organization of cell walls in Sandersonia aurantiaca floral tissue

WEED CONTROL IN FIELD GROWN TUBEROSES (Polianthes tuberosa, L .) CV. ‘DOUBLE’, IN THE WESTERN REGION ARID ZONE OF SAUDI ARABIA: A. WEED POPULATION DENSITY, GROWTH PERFORMANCES AND TUBEROSE CUT FLOWER YIELD, AS FUNCTIONS OF IRRIGATION FREQUENCIES, HAND WEEDING AND HERBICIDES

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