نتایج جستجو برای: dwarfing
تعداد نتایج: 550 فیلتر نتایج به سال:
All commercial sweet cherry trees are either budded or grafted. The part of the tree above the graft/bud union is known as the scion and the part below the graft/bud union is known as the rootstock. Sweet cherry scion cultivars have been selected over millennia for many reasons, but over the past century, breeding programs have concentrated mainly on achieving improved characteristics such as y...
BACKGROUND Asexuality has major theoretical advantages over sexual reproduction, yet newly formed asexual lineages rarely endure. The success, or failure, of such lineages is affected by their mechanism of origin, because it determines their initial genetic makeup and variability. Most previously described mechanisms imply that asexual lineages are randomly frozen subsamples of a sexual populat...
Dwarfing a Giant: Allometry and Ontogeny of Elephant Limb Bones Victoria L. Herridge, and John R. Hutchinson; Department of Biology, University College London, Gower Street, London, WC1E 6BT, UK ([email protected]), Structure and Motion Laboratory, Department of Veterinary Basic Sciences, The Royal Veterinary College, University of London, Hatfield, Hertfordshire, AL9 7TA, UK Elephants are t...
Because evolutionary processes such as genetic drift and natural selection play a crucial role in determining the response that species will have to human-induced disturbances, there is increasing interest in the evolutionary aspects of conservation biology. Harvesting select individuals in natural plant populations can bring about unforeseen impacts that may negatively affect fitness. We analy...
Children with the idiopathic nephrotic syndrome have been treated with intensive steroid therapy at various centres since prednisolone became available in 1955. Five years after onset, 65-70% of such children are free from significant proteinuria, and the death rate has been reduced to 10-15% by such therapy (Arneil and Lam, 1966; Cornfeld and Schwartz, 1966). Serious untoward effects, such as ...
The introduction of the Reduced height (Rht)-B1b and Rht-D1b semidwarfing genes led to impressive increases in wheat (Triticum aestivum) yields during the Green Revolution. The reduction in stem elongation in varieties containing these alleles is caused by a limited response to the phytohormone gibberellin (GA), resulting in improved resistance to stem lodging and yield benefits through an incr...
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