Cassava is an important crop in Africa, Asia, Latin America, and the Caribbean. Cassava can be produced adequately in drought conditions making it the ideal food security crop in marginal environments. Although cassava can tolerate drought stress, it can be genetically improved to enhance productivity in such environments. Drought adaptation studies in over three decades in cassava have identif...

The purpose of this investigation was to compare accuracy and precision of variance components and breeding values for international genetic evaluations based on national breeding values or animal performance records. A conventional progeny test scheme was simulated for 3 countries. True breeding values and observations were generated specific to production environments. Two production environm...

breeding places of a. stephensi were studied in bandar abbas city, on persian gulf to determine the characteristics of breeding places and the larval density. the conventional standard dipper was used and all stages in ten dippers were considered as measuring scales. the study showed the presence of larvae in seven different types of breeding places which were: barrels and pounds which were use...

Oilseed rape (OSR; Brassica napus L.) is a major crop in temperate regions and provides an important source of nutrition to many of the yield-enhancing insect flower visitors that consume floral nectar. The manipulation of mechanisms that control various crop plant traits for the benefit of pollinators has been suggested in the bid to increase food security, but little is known about inherent f...

crosses with one of the parents are often required, adding time to the process. Likewise, conventional breeding is limited to a relatively narrow genetic base since the trait must be present in a sexually compatible species. Even within a species, there is often considerable incompatibility, impeding the incorporation of selected traits into new cultivars. The use of recombinant DNA opens the d...

Plant breeders and nematologists have developed improved cultivars of important crop species with resistance to plant-parasitic nematodes. The effectiveness of these breeding efforts has depended on the availability of efficient screening procedures, identification of adequate sources of durable resistance, nature of the nematode feeding habit, and knowledge of the inheritance of resistance. Th...