02199naa a2200289 a 450000100080000000500110000800800410001910000200006024501110008026000090019152013060020065000120150665000150151865000130153365300210154670000160156770000170158370000150160070000170161570000160163270000140164870000130166270000140167570000250168970000140171477301810172816431632009-04-09       2007    bl uuuu     u00u1 u    #d1 aALVES, A. A. C.  aIdentifying the physiological and genetic traits that make cassava one of the most drought tolerant crops.  c2007  aMid-year report: activities accomplished: 1. Micropropagation and hardening of drought tolerant cassava contrasting varieties at EMBRAPA/CNPMF to produce planting material (stakes) for the experiments; 2. Harvest of the field screening trial, planted in May/2006 in Petrolina (Brazil), in which 60 genotypes were tested under irrigation and water deficit condition. The data evaluated are in process of final analysis; 3. Intermediate harvests in the field experiment planted in Dec/2006 in Petrolina (Brazil), with 24 drought tolerant contrasting cassava varieties under control and water deficit. Seven blocks were planted, with five plants/plot under randomised completed block design. Three blocks were harvested: 1) after 3 months under irrigation (Control 0);  2) After 4,5 months under irrigation (Control 1); and 3) After 3 months under irrigation followed by 1,5 month without irrigation. The following data were collected: plant height and branch lenght, leaf area of the top fully expanded leaf, leaf retention, leaf conductance, leaf temperature, air temperature, air relative humidity, radiation, soil moisture at 20 and 40 cm, samples of leaf disks (for ABA and carbohydrates), samples of stems (for carbohydrates), fresh weights of shoots and storage roots, and number of storage roots.  acassava  airrigation  aMandioca  aEstresse hidrico1 aFREGENE, M.1 aFERGUSON, M.1 aSETTER, T.1 aCEBALLOS, H.1 aMKAMILO, G.1 aKANJU, E.1 aOSEI, C.1 aSOUZA, A.1 aRODRÍGUEZ, M. A. D.1 aSILVA, A.  tIn: GENERATION CHALLENGE PROGRAMME. Project mid-year and final reports: competitive and commissioned projects: 2007. Mexico, DF: Generation Challenge Programme, 2007. p. 47-49.