کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4510022 1624702 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pratylenchus thornei populations reduce water uptake in intolerant wheat cultivars
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Pratylenchus thornei populations reduce water uptake in intolerant wheat cultivars
چکیده انگلیسی


• Planting wheat into high populations of P. thornei reduced the extraction rate in susceptible cultivars.
• High nematode populations reduced the supply of soil resources (water and nitrogen).
• A reduced canopy reduced demand, growth and yield potential.
• Decreased water demand caused a delay in the extraction front velocity and effectively changed the crop lower limit.
• The resulting yield loss of 34% was consistent across wet and dry seasons.

Pratylenchus thornei is a major pathogen of wheat crops in the northern grain region of Eastern Australia with an estimated annual yield loss of $38 million. Damaged crops show symptoms of water and nutrient stress that suggest uptake is significantly affected. In order to understand the mechanisms involved in reducing water uptake and consequently plant yield, detailed measurements of water extraction and leaf area were conducted on a range of wheat cultivars with differing levels of tolerance and resistance to P. thornei.Planting wheat into high populations of P. thornei reduced the extraction rate (kl) in the intolerant cultivars; this in turn caused a delay in the root extraction velocity and effectively changed the crop lower limit. The early season stress applied by the reduced extraction rate impeded canopy development that consequently reduced demand for water and nutrients, growth and yield potential. The resulting yield loss was consistent across both a wet and a dry wheat growing season with the intolerant cultivar yielding 34% less than the tolerant cultivar. Understanding the mechanism with which P. thornei reduces yield allows the impact of P. thornei to be included in simulation models to better understand how to manage this constraint to the Australian grain industry.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 161, May 2014, Pages 1–10
نویسندگان
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