کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8384205 1543631 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A proposed mechanism for high pathogen-caused mortality in the seed bank of an invasive annual grass
ترجمه فارسی عنوان
یک مکانیسم پیشنهادی برای مرگ بالای بیماری پاتوژن در بانک بذر چمن سالم تهاجمی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
Pyrenophora semeniperda can infect nondormant Bromus tectorum seeds under optimal germination conditions, but most escape mortality. This reduces pathogen fitness relative to infection of dormant seeds, which are almost always killed. However, field experiments showed that a large proportion of seeds killed following inoculum addition were not accounted for as dormant seeds, but instead were likely nondormant seeds that would have germinated without inoculum addition. We hypothesized that widely fluctuating water availability to seeds would favor pathogenesis by delaying germination and allowing disease progression at water potentials below those that permit radicle emergence. To test this, nondormant host seeds were inoculated, imbibed for 8 or 24 h, subjected to controlled dehydration for 1-21 d, rehydrated, and scored for mortality. With dehydration at −4 MPa, mortality increased with dehydration duration after short or long imbibition. At −40 MPa, mortality increased with dehydration duration only after long imbibition. At −150 MPa, there was no effect of dehydration duration on generally low mortality. These results illustrate that fluctuating moisture can cause high nondormant seed mortality, explaining how this pathogen kills nondormant seeds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fungal Ecology - Volume 35, October 2018, Pages 108-115
نویسندگان
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