نتایج جستجو برای: transgenic cotton
تعداد نتایج: 81130 فیلتر نتایج به سال:
In order to evaluate the functions of putative transcriptional regulatory regions of cotton genes, the upstream regulatory sequences (promoters) of two cotton genes, Gh-sp (seed protein) and Gh-rbcS (ribulose-1,5-bisphosphate carboxylase small subunit), were fused with a bb-glucuronidase (GUS) reporter gene and the cauliflower mosaic virus (CaMV) 35S terminator. These two gene constructs were t...
one concern about using transgenic plants is the genetic variation that occurred from theirs tissue culture and regeneration. molecular markers are an important element for efficient and effective determination of genetic variation. the present work was carried out to assess the genetic uniformity of transgenic cottons (bt and chitinase lines), using rapd, issr molecular markers and sds-page an...
Transgenic crops producing insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) are extensively cultivated worldwide. To counter rapidly increasing pest resistance to crops that produce single Bt toxins, transgenic plant 'pyramids' producing two or more Bt toxins that kill the same pest have been widely adopted. However, cross-resistance and antagonism between Bt toxins limit th...
Water scarcity is the major limiting factor for oasis-desert agricultural production of cotton. It necessary to improve cotton drought tolerance and minimize drought-related crop losses, transgenic approach efficient improvement. In order evaluate value ScALDH21 (G. hirsutum L.), it was tested in main region south Xinjiang, an environment extreme around desert. Transgenic cotton, overexpressing...
RNA interference (RNAi) has been developed as an efficient technology. RNAi insect-resistant transgenic plants expressing double-stranded RNA (dsRNA) that is ingested into insects to silence target genes can affect the viability of these pests or even lead to their death. HaHR3, a molt-regulating transcription factor gene, was previously selected as a target expressed in bacteria and tobacco pl...
Variability of endotoxin expression and/or concentration within transgenic cotton (Bt) varieties has been and continues to be a concern of cotton growers, researchers, and breeders. While not a consistent problem, it can cause major economic problems. Transgenic cotton cultivars, to be effective throughout the season, must produce additional levels of proteins that conventional cottons do not. ...
The cultivation of transgenic pest-resistant cropsmay reduce pesticide application, improve production and increase economic benefit. Breeding and planting transgenic pest-resistant crops is expected to be a promising way to control pests. Pest-resistant transgenic researches in China began in the early 1990s. In 1992, China developed the country’s first Bt protein gene (CryIA gene) with the in...
Gossypium hirsutum cellulose synthase catalytic subunit 4 (GhCesA4) plays an important role in cellulose biosynthesis during cotton fiber development. The transcript levels of GhCesA4 are significantly up-regulated as secondary cell wall cellulose is produced in developing cotton fibers. To understand the molecular mechanisms involved in transcriptional regulation of GhCesA4, β-glucuronidase (G...
Bioactive gibberellins (GAs) comprise an important class of natural plant growth regulators and play essential roles in cotton fiber development. To date, the molecular base of GAs' functions in fiber development is largely unclear. To address this question, the endogenous bioactive GA levels in cotton developing fibers were elevated by specifically up-regulating GA 20-oxidase and suppressing G...
Farm-scale evaluation of the impacts of transgenic cotton on biodiversity, pesticide use, and yield.
Higher yields and reduced pesticide impacts are needed to mitigate the effects of agricultural intensification. A 2-year farm-scale evaluation of 81 commercial fields in Arizona show that use of transgenic Bacillus thuringiensis (Bt) cotton reduced insecticide use, whereas transgenic cotton with Bt protein and herbicide resistance (BtHr) did not affect herbicide use. Transgenic cotton had highe...
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