OSMOTIC CONDITIONING EFFECT ON VIGOUR OF BEAN (Phaseolus vulgaris L.) SEEDLINGS

Revista Brasileira de Engenharia Agrícola e Ambiental

Fernandes, Pedro Dantas¹  Queiroz, Messias Firmino de²  Almeida, Francisco de Assis Cardoso¹ 

[1] UFPB, Campina Grande, Brazil;UEPB, Lagoa Seca, Brazil

关键词:  PEG-6000;    osmotic potential;    radicle/hypocotyl relation;    seed;   

DOI  :  10.1590/1807-1929/agriambi.v02n02p148-152

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objective of this work was to study the effect of six levels of osmotic potential (0, -0.2, -0.4, -0.6, -0.8 and -1MPa), induced by polyetilene glycol 6000 (PEG-6000), on the vigour of seed germination of ten bean cultivars (Phaseolus vulgaris, L.). The experiment was conducted in laboratory under controlled conditions of temperature and humidity, using paper towels as a substract. The experimental design was completely randomized in a 10 x 6 factorial scheme with four replications each consisting of 10 seeds. The growth of radicle and hypocotyl as well as the radicle/hypocotyl relation were evaluated. The measurement of seedlings was made in all cultivars, for each level of PEG-6000, when one of ten cultivars reached the 80% germination or after 20 days elapsed from the beginning of the test, with seedling showing the hypocotyl and the radicle well differentiated, with a minimum length of 0.5cm. The results obtained have shown that there was influence of PEG-6000 on the seedlings' vigour. 'Diamante Negro' was found to be the most vigourous cultivar under reduced osmotic potential (-0.4MPa and -0.6 MPa), while 'Safira' was the most sensitive one. In water stress conditions radicles tended to be longer than the hypocotyl, and the less tolerant genotypes developed higher radicle/hypocotyl relations.

【 授权许可】

Unknown