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

ABSTRACT 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).

Bibliographic Details

Main Authors:	NICOLAU,JOSEFA PATRÍCIA BALDUINO, SILVA,FRANCISCO EUDES DA, FELIX,FRANCIVAL CARDOSO, TORRES,SALVADOR BARROS, PACHECO,MAURO VASCONCELOS, PEREIRA,MÁRCIO DIAS
Format:	Digital revista
Language:	English
Published:	Universidade Federal Rural do Semi-Árido 2020
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-21252020000200555
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