Year: 2011
Type: article
Abstract: Drought stress is one of the most important abiotic factors in Eucalyptus sp. plantations which influences the growth and limits productivity in cultivated areas, mainly in central, northern and northeastern areas in Brazil, where large parts of these areas have limitations on water supply. The breeders are now looking for tolerant genotypes to overcome this challenge and the QTL mapping approach will help to understand the genetic control of drought tolerance. The objective of this study was to identify genetic loci controlling the phenotypic variation in drought tolerance in a Eucalytpus segregant progeny grown under drought and irrigation conditions. Material and methods Theprogenyusedinthisstudywasgeneratedbythe breeding program of Fibria Celulose and is composed of 184 F 1 genotypes from a cross between a tolerant and a susceptible clone to water stress, both E. grandis x E. urophylla hybrid tree. In a greenhouse condition, the progeny (seedlings with 70 days) was evaluated under two irrigation conditions (1- control: assigned to a well-watered regime with watering equal to transpiration loss and 2: submitted to water deficit until the onset of initial drought symptoms) in 4 different experiments. Growth (the relative increase in height and stem diameter; leaf number; leaf area; leaf, steam and root dry weight; root-shoot ratio) and physiological traits (net assimilation rate, stomatal conductance, transpiration, instantaneous and intrinsic water-use efficiency, relative water content in leaves, chlorophyll content index, photochemical efficiency and leaf water potential) were
Source: BMC Proceedings
Language: English
Topic: Genetics and Plant Breeding
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $2,290
OpenAlex ID: W2017198700