期刊
SCIENTIA AGRICOLA
卷 68, 期 2, 页码 131-138出版社
UNIV SAO PAOLO
DOI: 10.1590/S0103-90162011000200001
关键词
Gossypium hirsutum var. latifolium L.; PEG-6000; vigor; water potential
资金
- CAPES, Brazil
The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25 degrees C using germitest paper as substrate. A completely randomized design in a 4 x 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the least sensitive to the tested osmotic potentials, both in terms of germination and of vigor. The 'BRS-201' cultivar was mostly affected by the viability and vigor tests under water deficit conditions. Differential viability and vigor between cultivars were observed under the water stress levels.
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