نتایج جستجو برای: lactuca serriola
تعداد نتایج: 2443 فیلتر نتایج به سال:
Methods Data on the geographic distribution of L. serriola were assembled through a literature search as well as through floristic and herbarium surveys. Maps of the spread of L. serriola in Central and Northern Europe were prepared based on herbarium data. The spread was assessed more precisely in Germany, Austria and Great Britain by pooling herbarium and literature data. We modelled the bioc...
The effects of vegetation on wind erosion, especially in arid areas, are known, but few studies have assessed the quantitative impact of plant species. The aim of this study was to investigate the effects of plant species on wind erosion and deposits. Three experimental sites were selected in Sebri, Iran. Two sites contained two plant species, Launaea spinosa and Lactuca serriola of different s...
Gene escape from crops has gained much attention in the last two decades, as transgenes introgressing into wild populations could affect the latter's ecological characteristics. However, different genes have different likelihoods of introgression. The mixture of selective forces provided by natural conditions creates an adaptive mosaic of alleles from both parental species. We investigated segr...
Little previous work has been conducted on effects of natural, high-severity wildfires on nitrogen (N) dynamics. We measured aboveground plant biomass, foliar N, and net N mineralization 2 years after stand-replacing fires in lodgepole pine (Pinus contorta var. latifolia) forests in Grand Teton National Park, Wyoming, USA. We detected a five-fold difference in foliar N (% dry weight) among 14 s...
در بررسی که در سال 1374 به منظور یافتن ویروس موزائیک کاهو در مزارع کاهو اطراف مشهد انجام شد، تعدادی بوته کاهو که علائم موزائیک ، زردی و کوتولگی نشان می دادند، جمع آوری شد و مورد مطالعه قرار گرفتند. در مطالعات دامنه میزبانی، ویروس مورد نظر، رقمی از کاهو محلی (lactuca sativa l. var. iongitolia)، گلرنگ (carthamus tinctorius) و نخود ایرانی (cicer arietinum l.) را بطور سیستمیک آلوده نموده، همچنین رو...
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