02449nam a2200361 a 450000100080000000500110000800800410001910000370006024500610009726000400015830000090019850000180020752015450022565000160177065000160178665000120180265000090181465000100182365000100183365000260184365000240186965000150189365000170190865000150192565000110194065000090195165300220196065300240198265300310200665300110203765300200204865300190206810551712024-01-04       1987    bl uuuu  m   00u1 u    #d1 aNASCIMENTO, M. do P. S. C. B. do  aGermination and establishment of three tropical legumes.  aTucson: University of Arizonac1987  a96p.  aPh.D. Thesis.  aStudies were conducted to test germination and to determine morphological and physiological characteristics of Canavalia obtusifolia DC., Cratylia floribunda Benth. and Dioclea lasiophylla Mart., which allow them to cope with water stress. Germination studies were done using PEG, moist paper and three different soils, in a germinator. Establishement and early growth studies were conducted in a greenhouse, using two different soils. In PEG, maximum percentage germination were near 100% for C.obtusifolia and D.lasiophylla and 75% for C.floribunda. Respectivaly, the water potentials for maximum germination were from 0 to -1 bar, from 0 to -5 bars, and at -5 bars. In moist paper, however, C.floribunda had near 100% germination. In the three soils, the three species had near or equal to 100% germination and their radicle grew more than in PEG. The rate of germination tended to be faster in soil than in PEG. However, it was affected by both soil and seed characteristics. So, germination was slower in Canelo, a pH 4, clay soil, as well as for the large-seeded C.obtusifolia, maybe due to the reduction in the soil water conductivity at the seed-soil interface. It is suggested that leakage of solutes and spoilage of seeds as well as rapid water uptake at high water potentials, resulted in low germination of C.floribunda in PEG. Plants of C.floribunda and D.lasiophylla did not decrease their stomatal conductance or transpiration under high water stree, and their leaf water and osmotic potentials were sharply reduced. ........  agermination  agreenhouses  alegumes  asoil  awater  aÁgua  aCanavalia Obtusifolia  aCratylia Floribunda  aFisiologia  aGerminação  aLeguminosa  aPlanta  aSolo  aCasa-de-vegetacao  aDioclea lasiophylla  aPlanta leguminosa tropical  aPlants  aRegiao tropical  aTropical zones