نتایج جستجو برای: populus alba
تعداد نتایج: 10668 فیلتر نتایج به سال:
In order to better understand the genetic regulation of secondary growth in hybrid aspen (Populus tremula L.xP. alba L.), we carried out a series of cDNA-amplified fragment length polymorphism (AFLP)-based transcriptome analyses in vertical stem segments that represent a gradient of developmental stages with regard to secondary growth. This approach allowed us to screen >80% of the transcriptom...
Lignin is one of the main factors determining recalcitrance to enzymatic processing of lignocellulosic biomass. Poplars (Populus tremula x Populus alba) down-regulated for cinnamoyl-CoA reductase (CCR), the enzyme catalyzing the first step in the monolignol-specific branch of the lignin biosynthetic pathway, were grown in field trials in Belgium and France under short-rotation coppice culture. ...
Silencing CAFFEOYL SHIKIMATE ESTERASE Affects Lignification and Improves Saccharification in Poplar.
Caffeoyl shikimate esterase (CSE) was recently shown to play an essential role in lignin biosynthesis in Arabidopsis (Arabidopsis thaliana) and later in Medicago truncatula However, the general function of this enzyme was recently questioned by the apparent lack of CSE activity in lignifying tissues of different plant species. Here, we show that down-regulation of CSE in hybrid poplar (Populus ...
هوازدگی عامل اصلی تخریب سطح چوب در فضای باز به شمار می رود. درک این فرآیند در چوب‌های مختلف اهمیت بالایی در حفاظت چوب دارد. با توجه به کاربرد گسترده چوب سپیدار (Populusalba L.) در فضای باز، تغییرات ساختاری زیست‌پلیمرهای سطح این چوب تحت تاثیر هوازدگی تسریع شده پس از 300 و 800 ساعت مورد مطالعه قرار گرفت. میزان کاهش جرم پس از هوازدگی اندازه‌گیری شد. تغییرات ظاهری با استفاده از ر...
Sucrose export from source organs, and its subsequent distribution among differentiating organs in wood-forming stems and elsewhere depends on the activity of sucrose transporters (SUTs). There are no comprehensive reports on SUT function in temperate tree species valued for their lignocellulosic biomass. To begin to address this gap, the SUT gene family was characterized and functionally analy...
Transgenic down-regulation of the Pt4CL1 gene family encoding 4-coumarate:coenzyme A ligase (4CL) has been reported as a means for reducing lignin content in cell walls and increasing overall growth rates, thereby improving feedstock quality for paper and bioethanol production. Using hybrid poplar (Populus tremula × Populus alba), we applied this strategy and examined field-grown transformants ...
A poplar hybrid, Populus tremula x Populus alba, was transformed with the bacterial genes for either glutathione reductase (GR) (gor) or glutathione synthetase (GS) (gshII). When the gor gene was targeted to the chloroplasts, leaf GR activities were up to 1000 times greater than in all other lines. In contrast, targeting to the cytosol resulted in 2 to 10 times the GR activity. GR mRNA, protein...
Lignin impedes access to cellulose during biofuel production and pulping but trees can be genetically modified to improve processing efficiency. Modification of lignin may have nontarget effects on mechanical and chemical resistance and subsequent arthropod community responses with respect to pest susceptibility and arthropod biodiversity. We quantified foliar mechanical and chemical resistance...
The objectives of this study were to examine the foliar sensitivity to ozone exposure of 12 tree, shrub, and herbaceous species native to southern Switzerland and determine the seasonal cumulative ozone exposures required to induce visible foliar injury. The study was conducted from the beginning of May through the end of August during 2000 and 2001 using an open-top chamber research facility l...
Bu çalışmada Göreme Milli Parkı içerisinde yayılış gösteren epifitik karayosunlarının substrat tercihleri ordinasyon yöntemleri kullanılarak araştırılmıştır. Çalışmada istatistik hesaplamalar için açık kaynak kodlu PAST (PAleontological STatistics) programı kullanılmıştır. program ile biyolojik çeşitlilik ve benzerlik indeksleri hesaplanmış Temel Bileşen (PCA) Küme (CA) analizleri yapılmıştır. ...
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