Abstract
ABSTRACT: The objective of the following research was to investigate the physiological responses of two bahiagrass genotypes (Paspalum notatum Flügge) submitted to water restriction, induced by polyethylene glycol (PEG6000), during seed germination. Seeds of cv. Pensacola (diploid) and Bagual ecotype (tetraploid) were placed on paper moistened with osmotic solutions at potentials of 0.0; -0.1; -0.2 and -0.3 MPa. Composed of two subsamples of 100 seeds and four experimental units per treatment, the germination test was conducted in a germination chamber under alternating temperatures of 30 °C (8 hours) and 20 °C (16 hours), with presence of light during the higher temperature. Final germination percentage and germination speed index of the seeds, as well as early growth, activity and expression of antioxidant enzymes of seedlings were evaluated. The water restriction induced by PEG6000 reduced the percentage of germination in Pensacola (from 74% to 59%) and Bagual (34% to 10%). For the latter, the evaluation of seedlings showed higher dry mass in relation to cv. Pensacola (1.7 times higher in root and 1.6 times in shoot). In response to moderate water restriction, the genotypes showed increases in root growth (1.7 times higher in -0.1 compared to 0.0 MPa), both in expression and enzymatic activity (superoxide dismutase and catalase).
Highlights
Bahiagrass - Paspalum notatum Flügge is, admittedly, one of the ten species with the highest relative cover for the South Brazilian grasslands (ANDRADE et al, 2019)
The individual evaluation showed that the osmotic solution of -0.3 MPa promoted a significant reduction in Final germination percentage (FG) (34%) and germination speed index (GSI) (3.1) when compared to the 0.0 MPa (54% and 6.87), -0.1 MPa (55% and 8.13) and -0.2 MPa (50% and 5.8), as well as control treatment
There was progress in the performance of seedlings under moderate water restriction (Figure 2), with the presence of interaction between the factors studied for shoot length and mass of the seedlings (Figure 2 A and C)
Summary
Bahiagrass - Paspalum notatum Flügge is, admittedly, one of the ten species with the highest relative cover for the South Brazilian grasslands (ANDRADE et al, 2019). V.50, n.5, when introduced in association with favorable environmental conditions and good management practices, its competitive capacity and productivity is significantly improved (PRINCE et al, 2018; MACHADO et al, 2019). This species can be an alternative for water-constrained regions (SEVER MUTLU et al, 2011). Under experimental conditions still in the first year of evaluations, this ecotype gave a 38% higher dry mass production in comparison to the traditional cv. In a study conducted for two years, WEILER et al (2018) reported that Bagual had an accumulated production of dry mass 4.8 times higher than Pensacola cv.
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