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The Rlnn1 locus, which resides on chromosome 7A of bread wheat (Triticum aestivum L.) confers moderate resistance against the root lesion nematode Pratylenchus neglectus. Prior to this research, the exact linkage relationships of Rlnn1 with other loci on chromosome 7A were not clear and there were no simple codominant markers available for selection of(More)
Root systems are critical for water and nutrient acquisition by crops. Current methods measuring root biomass and length are slow and labour-intensive for studying root responses to environmental stresses in the field. Here, we report the development of a method that measures changes in the root DNA concentration in soil and detects root responses to(More)
In Mediterranean-type environments, effective capture of intermittent rainfall is important for crop drought tolerance. Two wheat genotypes RAC875 and Kukri differing in drought tolerance vary in several shoot traits and grain yield. Little is known about root traits contributing to drought tolerance. This study examined dynamic root responses to cyclic(More)
The root-lesion nematodes (RLN) Pratylenchus thornei and P. neglectus are widely distributed in Australian grain producing regions and can reduce the yield of intolerant wheat cultivars by up to 65 %, costing the industry ~123 M AUD/year. Consequently, researchers in the northern, southern and western regions have independently developed procedures to(More)
BACKGROUND Sudden death syndrome (SDS) of soybean caused by Fusarium virguliforme spreads and reduces soybean yields through the North Central region of the U.S. The fungal pathogen and Heterodera glycines are difficult to manage. METHODOLOGY/PRINCIPAL FINDINGS The objective was to determine the contributions of H. glycines and F. virguliforme to SDS(More)
This study sought to determine the prevalence and crop sequence associations of Gaeumannomyces graminis var. avenae (Gga) in cereal cropping fields in New Zealand. Gaeumannomyces graminis var. tritici (Ggt) and Gga cause the root disease take-all on wheat (Triticum aestivum) and barley (Hordeum vulgare). Gga also causes take-all on oats (Avena sativa) and,(More)
The potential impact of environmental change on terrestrial Antarctic ecosystems can be explored by inspecting biodiversity patterns across large-scale gradients. Unfortunately, morphology-based surveys of Antarctic invertebrates are time-consuming and limited by the cryptic nature of many taxa. We used biodiversity information derived from high-throughput(More)
In a study, over three growing seasons, of Gaeumannomyces graminis var. tritici (Ggt) and take-all disease in commercial wheat fields (that were in their first, second, third or fourth year of consecutive wheat) in New Zealand, Ggt concentrations in soil (the amount of Ggt DNA measured using quantitative PCR) and take-all incidence and take-all index (TAI)(More)
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