TITLE:
Effect of Osmotic Stress on the Initial Development of Bean Seedlings
AUTHORS:
Pablo Diego Silva Cabral, Leonardo N. S. dos Santos, Henrique Duarte Vieira, Tais Cristina Bastos Soares, Cintia Aparecida Bremenkamp, Weverton Pereira Rodrigues
KEYWORDS:
Phaseolus vulgaris L., Mannitol, Water Stress
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.13,
June
24,
2014
ABSTRACT: One of the methods
to determine the tolerance of plants to water stress is the observation of germination
of seeds under stress induced in laboratory conditions. Thus, the aim was to
evaluate the response of four common bean cultivars to water deficit simulated
under laboratory conditions. Two common landrace genotypes acquired from
farmers (FORT 07 and FORT 08) and two commercial cultivars, IAPAR 81 and
Serrano were evaluated. The different levels of water deficit were induced with
mannitol solution. The experimental design was completely randomized and a factorial
scheme 5 × 4 (osmotic
potential x genotypes), with four replications. The characteristics: primary
root protrusion, seed vigor, normal and abnormal seedling, seedling and root
length, fresh and dry weight of seedling and root were evaluated. By reducing
the osmotic potential seedling vigor bean was more affected than the primary
root protrusion. Regardless of cultivar, there was a significant and
progressive reduction in the normal seedlings percentage from potential -0.3 MPa. The IAPAR
81 and FORT 07 cultivars showed higher tolerance to water deficit compared to
other cultivars.