The role of carbohydrate reserves in the growth, resilience, and persistence of cabbage palm seedlings ( Sabal palmetto )

Oecologia ◽  
1998 ◽  
Vol 117 (4) ◽  
pp. 460-468 ◽  
Author(s):  
K. McPherson ◽  
K. Williams



Biosensors ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 188
Author(s):  
Martin J. Oates ◽  
Nawaf Abu-Khalaf ◽  
Carlos Molina-Cabrera ◽  
Antonio Ruiz-Canales ◽  
Jose Ramos ◽  
...  

Lethal Bronzing Disease (LB) is a disease of palms caused by the 16SrIV-D phytoplasma. A low-cost electronic nose (eNose) prototype was trialed for its detection. It includes an array of eight Taguchi-type (MQ) sensors (MQ135, MQ2, MQ3, MQ4, MQ5, MQ9, MQ7, and MQ8) controlled by an Arduino NANO® microcontroller, using heater voltages that vary sinusoidally over a 2.5 min cycle. Samples of uninfected, early symptomatic, moderate symptomatic, and late symptomatic infected palm leaves of the cabbage palm were processed and analyzed. MQ sensor responses were subjected to a 256 element discrete Fourier transform (DFT), and harmonic component amplitudes were reviewed by principal component analysis (PCA). The experiment was repeated three times, each showing clear evidence of differences in sensor responses between the samples of uninfected leaves and those in the early stages of infection. Within each experiment, four groups of responses were identified, demonstrating the ability of the unit to repeatedly distinguish healthy leaves from diseased ones; however, detection of the severity of infection has not been demonstrated. By selecting appropriate coefficients (here demonstrated with plots of MQ5 Cos1 vs. MQ8 Sin3), it should be possible to build a ruleset classifier to identify healthy and unhealthy samples.



2020 ◽  
Vol 261 ◽  
pp. 109034 ◽  
Author(s):  
Kenneth Breen ◽  
Stuart Tustin ◽  
John Palmer ◽  
Helen Boldingh ◽  
Dugald Close


Oecologia ◽  
1996 ◽  
Vol 105 (4) ◽  
pp. 428-434 ◽  
Author(s):  
L. Perry ◽  
K. Williams
Keyword(s):  




HortScience ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. 520-524 ◽  
Author(s):  
Pedro B. Oliveira ◽  
Cristina M. Oliveira ◽  
António A. Monteiro

The aim of this study was to determine the effects of date of summer pruning and cane densities on growth and fruiting characteristics of the raspberry (Rubus idaeus) plant. Three summer-pruning dates (early, middle, and late July) and four cane densities (8, 16, 24, and 32 canes/m row) were imposed to the greenhouse-grown primocane-fruiting raspberry `Autumn Bliss' in 2 consecutive years (1994 and 1995). A higher light microclimate and CO2 assimilation rate were measured within the canopy at the lowest density. Some compensation in CO2 assimilation rates were observed in the upper leaves of the high-density treatments, probably in response to low light. Delayed pruning decreased yield per cane and per row. The highest yields per cane were always observed at the lowest cane density. Densities of 16 and 24 canes/m produced the highest fruit yield. Light conditions appeared to be the most important environmental factor affecting plant productivity. Fruit were a weaker sink than roots; therefore, the role of carbohydrate reserves should be investigated.



1973 ◽  
Vol 3 (2) ◽  
pp. 243-250 ◽  
Author(s):  
George A. Schier ◽  
John C. Zasada

The role of carbohydrate reserves in initial sucker growth from excised roots of Alaskan and Utahan aspen (Popnlustremuloides Michx.) was investigated by correlating the seasonal variation in sucker production in darkness with the concentration of total nonstructural carbohydrates (T.N.C.) in the roots. Sucker numbers were not correlated with T.N.C. content. Dry weight of suckers per cutting (D.W./C) was a function of T.N.C. percentage and the number of suckers per cutting (No./C). In the additive model, D.W./C = b0 + b1 (No./C) + b2 (T.N.C), T.N.C. was a significant contributor to sucker dry weight. Although dry weight per cutting increased as the number of suckers became larger, dry weight per sucker decreased. Within geographic area, number and dry weight of suckers and T.N.C. percentage were related to both date of collection and clone of origin. Seasonal trends in T.N.C. content were similar in the Utahan and Alaskan roots studied.



2011 ◽  
Vol 31 (5) ◽  
pp. 519-530 ◽  
Author(s):  
A. Bustan ◽  
A. Avni ◽  
S. Lavee ◽  
I. Zipori ◽  
Y. Yeselson ◽  
...  


2009 ◽  
Vol 19 (4) ◽  
pp. 717-718 ◽  
Author(s):  
Monica L. Elliott

Since the mid-1990s, several new pathogens and diseases have emerged on palms (Arecaceae) growing in Florida. These include two formae speciales of Fusarium oxysporum, with f. sp. canariensis causing fusarium wilt of canary island date palm (Phoenix canariensis) and a new forma specialis causing Fusarium wilt of queen palm (Syagrus romanzoffiana) and mexican fan palm (Washingtonia robusta). The texas phoenix palm decline phytoplasma (‘Candidatus Phytoplasma palmae’ subgroup 16SrIV-D), which causes a lethal yellowing-type disease, has been detected in date palms (Phoenix spp.), queen palm, and cabbage palm (Sabal palmetto). New rachis (petiole) blight pathogens include Cocoicola californica on mexican fan palm and Serenomyces species on several palm species.



1996 ◽  
Vol 83 (12) ◽  
pp. 1566-1570 ◽  
Author(s):  
Kelly McPherson ◽  
Kimberlyn Williams
Keyword(s):  


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