Comparisons of virulence of pathogens associated with crown and root diseases of strawberry in Western Australia with special reference to the effect of temperature

2011 ◽  
Vol 131 ◽  
pp. 39-48 ◽  
Author(s):  
Xiangling Fang ◽  
Dennis Phillips ◽  
Hua Li ◽  
Krishnapillai Sivasithamparam ◽  
Martin J. Barbetti
Keyword(s):  
Special Reference ◽  
Western Australia ◽  
Effect Of Temperature ◽  
Root Diseases

Temperature effects on germination of Trifolium balansae and T. resupinatum with special reference to high-temperature dormancy

1994 ◽  
Vol 45 (3) ◽  
pp. 689 ◽  
Author(s):  
PI Jansen ◽  
RL Ison
Keyword(s):  
High Temperature ◽  
Special Reference ◽  
Western Australia ◽  
Temperature Effects ◽  
Seed Weight ◽  
South Australia ◽  
Plant Introduction ◽  
Effect Of Temperature ◽  
Pasture Legumes ◽  
Thousand Seed Weight

The effect of temperature on germination of the annual pasture legumes Trifolium balansae and T. resupinaturn was investigated. Seed of T. resupinatum lines SA 12240, SA 14433 (from South Australia), C1Z1Res-B, CPI (Commonwealth Plant Introduction number) 026202-3, CPI 026205-2, CPI 027376-2, SA 14433 (from Western Australia), SA 18904, SA 18922, SA 19851 and CPI 045887-2 and cvv. Kyambro and Maral and T. balansae cv. Paradana and lines CPI 045856-1, CPI 045856-4 and AZ 2326 was germinated at 10, 15, 20, 25, 30 and 35�C. T. subterraneum cv. Junee was included for comparison. It was found that germination in all lines except Maral was reduced at 35�C, whereas at 30�C germination was reduced significantly in all lines except Maral, ClZlRes-B, CPI 026202-3, CPI 026205-2, CPI 027376-2, SA 19851 and CPI 045887-2. Germination at 35OC in T. resupinaturn was related to thousand seed weight with the equation: Germination = -31.19+92-39 thousand seed weight (r2 = 0.76). In order to determine the mechanism responsible for the failure of seed to germinate at temperatures above 25�C, seed of T. resupinatum lines SA 12240 and SA 14433 and Maral and T. balansae cv. Paradana was allowed to germinate at temperatures of 25, 30, 35, 40, 45 and 50�C for 8 h, 1, 2, 5 and 10 days after which they were placed at 15� C for 10 days. It was found that temperatures in the 30-40�C temperature range inhibited germination in all lines except Maral, but the same seed germinated readily when placed at 15�C. This seed was considered to possess an enforced high-temperature dormancy. Seed of all lines exposed to 45 and 50�C for longer than 8 h died, but at 8 h final germination was unaffected. It was concluded that high-temperature dormancy could play a role in preventing seed from germinating in the case of a false break. It was proposed that lines should be screened for high-temperature dormancy.

scholarly journals Protease-producing microorganisms inhabiting salted fish (Moloha) with special reference to protease activity of Bacillus subtilis

2014 ◽  
Vol 63 (3-4) ◽  
pp. 303-307 ◽  
Author(s):  
M. H. Abd-Alla ◽  
S. A. Omar ◽  
M. A. El-Nagdy
Keyword(s):  
Bacillus Subtilis ◽  
Salt Tolerance ◽  
Metal Ions ◽  
Special Reference ◽  
Protease Activity ◽  
Enzyme Production ◽  
Effect Of Temperature ◽  
Protease Production ◽  
Salted Fish ◽  
Tanning Industry

The investigation was designed to isolate and identify the proteolytic microorganisms inhabiting salted fish. <i>Bacillus subtilis</i> was chosen as the most promising protease producer. Some properties of the crude protease are presented, the effect of metal ions on protease production has been studied. It was shown that Ca<sup>2+</sup> and Mg<sup>2+</sup> stimulated, while Co<sup>2+</sup> , Zn<sup>2+</sup> and Cu<sup>2+</sup> inhibited the enzyme production. The effect of temperature and pH and salt tolerance have also been studied. Protease activity was stable in 25% NaCl. The favourable characteristics of the enzyme might have extensive application in laundry detergents and in tanning industry.

scholarly journals Lessons from EdTech'86

1987 ◽  
Vol 3 (1) ◽  
Author(s):  
Peter Hosie
Keyword(s):  
Educational Technology ◽  
Special Reference ◽  
Western Australia ◽  
Australian Society ◽  
Biennial Conference ◽  
Education And Technology ◽  
The University

<span>The Australian Society for Educational Technology holds a biennial Conference to allow members and others interested in education and technology to get together, discuss issues and share experiences. The 1986 Conference, EdTech'86, was held on the campus of the University of Western Australia in December 1986. Peter Hosie summarises an evaluation of the Conference, with special reference to the next ASET Conference - EdTech '88 - to be held in Canberra in September 1988.</span>

scholarly journals Predicting Cereal Root Disease in Western Australia Using Soil DNA and Environmental Parameters

2015 ◽  
Vol 105 (8) ◽  
pp. 1069-1079 ◽  
Author(s):  
Grant J. Poole ◽  
Martin Harries ◽  
D. Hüberli ◽  
S. Miyan ◽  
W. J. MacLeod ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Western Australia ◽  
Crop Production ◽  
Environmental Parameters ◽  
Gaeumannomyces Graminis ◽  
Wheat Roots ◽  
Soil Dna ◽  
Root Diseases ◽  
Pathogen Dna ◽  
Root Health

Root diseases have long been prevalent in Australian grain-growing regions, and most management decisions to reduce the risk of yield loss need to be implemented before the crop is sown. The levels of pathogens that cause the major root diseases can be measured using DNA-based services such as PreDicta B. Although these pathogens are often studied individually, in the field they often occur as mixed populations and their combined effect on crop production is likely to vary across diverse cropping environments. A 3-year survey was conducted covering most cropping regions in Western Australia, utilizing PreDicta B to determine soilborne pathogen levels and visual assessments to score root health and incidence of individual crop root diseases caused by the major root pathogens, including Rhizoctonia solani (anastomosis group [AG]-8), Gaeumannomyces graminis var. tritici (take-all), Fusarium pseudograminearum, and Pratylenchus spp. (root-lesion nematodes) on wheat roots for 115, 50, and 94 fields during 2010, 2011, and 2012, respectively. A predictive model was developed for root health utilizing autumn and summer rainfall and soil temperature parameters. The model showed that pathogen DNA explained 16, 5, and 2% of the variation in root health whereas environmental parameters explained 22, 11, and 1% of the variation in 2010, 2011, and 2012, respectively. Results showed that R. solani AG-8 soil pathogen DNA, environmental soil temperature, and rainfall parameters explained most of the variation in the root health. This research shows that interactions between environment and pathogen levels before seeding can be utilized in predictive models to improve assessment of risk from root diseases to assist growers to plan more profitable cropping programs.

Sign in / Sign up

Export Citation Format

Share Document