Effect of Cu stress on the invertase activity and root growth in two populations ofRumex dentatusL. with different Cu tolerance

2008 ◽  
Vol 23 (4) ◽  
pp. 443-450 ◽  
Author(s):  
Yu Huang ◽  
Zhi‐Ting Xiong ◽  
Ling‐Peng Dai ◽  
Jing‐Qing Gao
Keyword(s):  
Root Growth ◽  
Invertase Activity ◽  
Cu Stress ◽  
Two Populations ◽  
Cu Tolerance

Differential Root Morphology between Metallicolous and Non-Metallicolous Populations of Rumex japonicus under Copper Stress

2013 ◽  
Vol 726-731 ◽  
pp. 81-84
Author(s):  
Wu Xing Huang ◽  
Cong Ren ◽  
Jing Qing Gao
Keyword(s):  
Root Morphology ◽  
Root Surface ◽  
Root Diameter ◽  
Copper Stress ◽  
Shoot Biomass ◽  
Root Surface Area ◽  
Cu Stress ◽  
Root Shoot Ratio ◽  
Rumex Japonicus ◽  
Two Populations

Two Rumex japonicus populations, one from copper (Cu) mine and the other from uncontaminated site, were studied for root morphology and biomass under Cu stress. Main root length and number of tips of the two populations were both significantly inhibited by Cu treatments. However, those of metallicolous population (MP) were higher than non-metallicolous population (NMP) under Cu stress. Cu treatments significantly inhibited root surface area in NMP while MP showed little difference from control. Cu treatments inhibited average root diameter and root/shoot ratio in NMP, but those in MP were significantly higher than control. Cu treatments significantly inhibited shoot biomass and root biomass in NMP. These results suggested that more assimilates allocated to root and the average root diameter increased under Cu stress to form a greater and stronger root might be partly reasons why R. japonicus can colonize the Cu enriched soils.

Effects of Copper Stress on Sucrose Metabolism in Seed of Two Rumex dentatus L. Populations

2013 ◽  
Vol 726-731 ◽  
pp. 102-105
Author(s):  
Wu Xing Huang ◽  
Cong Ren ◽  
Jing Qing Gao
Keyword(s):  
Cell Wall ◽  
Reducing Sugars ◽  
Control Cell ◽  
Invertase Activity ◽  
Sucrose Metabolism ◽  
The Other ◽  
Copper Stress ◽  
Cell Wall Invertase ◽  
Vacuolar Invertase ◽  
Cu Stress

Two Rumex dentatus populations, one from copper (Cu) mine and the other from uncontaminated site, were studied for sucrose metabolism of seed under Cu stress. Cu treatment significantly inhibited vacuolar invertase activity in non-metallicolous population (NMP), while it in metallicolous population (MP) was markedly higher than control. At control, cell wall invertase activity in MP showed little difference from NMP. However, after Cu treatment, cell wall invertase activity in MP was significantly higher than NMP. Activity of N/A-Inv was not affected by population or Cu treatment. Compared with control, sucrose and reducing sugars contents in MP were increased by Cu treatment, but those in NMP was decreased. Cu concentration in seed of NMP was higher than MP under Cu stress. These results suggested less Cu transported to seed and efficient sucrose metabolism in seed of MP might be partly reasons why R. dentatus can successful reproduction at Cu enriched soils.

Resistance and tolerance of grape rootstocks to South Australian populations of root-knot nematode

1984 ◽  
Vol 24 (125) ◽  
pp. 277 ◽  
Author(s):  
GR Stirling ◽  
RM Cirami
Keyword(s):  
Root Growth ◽  
South Australia ◽  
Nematode Resistance ◽  
Field Trials ◽  
The Other ◽  
Meloidogyne Arenaria ◽  
Root Knot Nematode ◽  
Good Resistance ◽  
Pathogenic Variation ◽  
Two Populations

Twenty-three grape rootstocks and four commercial varieties were screened in pots for resistance to populations of root-knot nematode from the Barossa Valley, Riverland and Southern Vales regions of South Australia. Four species (Meloidogyne arenaria, M. hapla, M. incognita and M. javanica) were present in the Barossa Valley population, while the other two populations contained only M. hapla and M. javanica. The Barossa Valley population multiplied better and produced more galls than the other populations, but the resistance of each rootstock relative to others was similar for all three nematode populations. The most resistant rootstocks were Ramsey, Dog Ridge, Freedom, Schwarzmann, 16 16, K51-32 and K51-40. Rootstocks with high or moderate nematode resistance in pots also showed good resistance in three field trials. The tolerance of each rootstock to root-knot nematode was evaluated by comparing root growth in the presence and absence of the nematode. Rootstocks with the best nematode resistance were also the most tolerant. Although variations in pathogenicity are often observed between species of Meloidogyne and within populations of the same species, we concluded that nematode resistant grape rootstocks would be useful against the range of pathogenic variation in the nematode likely to be encountered in South Australia.

Water relations and root growth of two populations of Gutierrezia sarothrae

1998 ◽  
Vol 39 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Changgui Wan ◽  
Ronald E Sosebee ◽  
Bobby L McMichael
Keyword(s):  
Root Growth ◽  
Water Relations ◽  
Gutierrezia Sarothrae ◽  
Two Populations

Comparison of Principal Component Solutions in Two Populations

Methodology ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Gregor Sočan
Keyword(s):  
Simulation Study ◽  
Principal Components ◽  
Common Factor ◽  
Principal Component ◽  
Component Model ◽  
Bootstrap Procedure ◽  
Factor Loadings ◽  
Component Loadings ◽  
Principal Component Model ◽  
Two Populations

Abstract. When principal component solutions are compared across two groups, a question arises whether the extracted components have the same interpretation in both populations. The problem can be approached by testing null hypotheses stating that the congruence coefficients between pairs of vectors of component loadings are equal to 1. Chan, Leung, Chan, Ho, and Yung (1999) proposed a bootstrap procedure for testing the hypothesis of perfect congruence between vectors of common factor loadings. We demonstrate that the procedure by Chan et al. is both theoretically and empirically inadequate for the application on principal components. We propose a modification of their procedure, which constructs the resampling space according to the characteristics of the principal component model. The results of a simulation study show satisfactory empirical properties of the modified procedure.

Cadmium and copper change root growth and morphology of Pinus pinea and Pinus pinaster seedlings

1994 ◽  
Vol 92 (4) ◽  
pp. 675-680 ◽  
Author(s):  
Iduna Arduini ◽  
Douglas L. Godbold ◽  
Antonino Onnis
Keyword(s):  
Root Growth ◽  
Pinus Pinaster ◽  
Pinus Pinea
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