DISCONTINUOUS HYDRATION ON THE GERMINATION OF Mimosa caesalpiniifolia AND Pityrocarpa moniliformis SEEDS UNDER WATER STRESS.

NICOLAU, JOSEFA PATRÍCIA BALDUINO; DA SILVA, FRANCISCO EUDES; CARDOSO FELIX, FRANCIVAL; BARROS TORRES, SALVADOR; VASCONCELOS PACHECO, MAURO; DIAS PEREIRA, MÁRCIO

The use of discontinuous hydration cycles can act in improving seed germination and seedling initial growth under water stress. In this context, the objective of this study was to evaluate the effect of discontinuous hydration on the germination of Mimosa caesalpiniifolia and Pityrocarpa moniliformis seeds under water stress. For this, seeds of these species were subjected to 0 (without hydration), 2 and 4 hydration cycles (18 h) and dehydration (12 and 18 h, respectively), with subsequent germination under water stress simulated for osmotic potentials of 0.0 (distilled water), -0.2, -0.4, -0.6 and -0.8 MPa. Seedlings were evaluated using tests of germination, germination speed index, mean germination time and seedling length. Discontinuous hydration in M. caesalpiniifolia and P. moniliformis seeds hampers germination and vigor of seedlings under water stress up to -0.6 MPa. However, the use of two cycles in P. moniliformis favors germination under more severe water stress (-0.8 MPa).

GERMINATION; HYDRATION; SEEDS; MIMOSA; DISTILLED water; WATER

Revista Caatinga, 2020, Vol 33, Issue 2, p555

0100-316X

Academic Journal

10.1590/1983-21252020v33n228rc