Advisor(s)
Abstract(s)
The increasing scarcity of water demands proper water management practices to ensure
crop sustainability. In this study, the effect of drought stress and biostimulants application on the
yield and chemical composition of green pods and seeds of common bean (Phaseolus vulgaris L.) was
evaluated. For this purpose, four commercially available biostimulant products, namely Nomoren
(G), EKOprop (EK), Veramin Ca (V), and Twin-Antistress (TW), were tested under two irrigation
regimes: normal irrigation (W+) and water-holding (W-) conditions. The highest increase (20.8%) of
pods total yield was observed in EKW+ treatment due to the formation of more pods of bigger size
compared to control treatment (CW+). In addition, the highest yield under drought stress conditions
was recorded for the GW- treatment (5691 139 kg/ha). Regarding the effects of biostimulants on
the protein and ash content of pods, the application of VW+ treatment (first harvest of pods; 201
+- 1 and 79 +- 1 g/kg dw for proteins and ash content, respectively) and GW+ (second harvest of
pods; 207.1 +- 0.1 and 68.4 +- 0.5 g/kg dw for proteins and ash content, respectively) showed the best
results. For seeds, the application of GW+ treatment resulted in the highest content for fat, protein,
and ash content (52.7 +- 0.1, 337 +- 1, 56 +- 1 g/kg dw) and energetic value (5474 +- 3 kcal/kg dw).
γ-tocopherol was the main detected tocopherol in pods and seeds, and it was significantly increased
by the application of TWW- (first harvest of pods; 6410 +- 40 μg/kg dw), VW- (second harvest of pods; 3500 +- 20 μg/kg dw), and VW+ (seeds; 39.8 +- 0.1 g/kg dw) treatments. EKW- treatment resulted in the lowest oxalic acid content for both pod harvests (26.3 +- 0.1 g/kg dw and 22.7 +- 0.2 g/kg dw for the first and second harvest of pods, respectively) when compared with the rest of the treatments where biostimulants were applied, although in all the cases, the oxalic acid content was considerably low.
Fructose and sucrose were the main sugars detected in pods and seeds, respectively, while the highest
content was recorded for theTWW- (first harvest of pods) andGW- (second harvest of pods and seeds)
treatments. The main detected fatty acids in pods and seeds were α-linolenic, linoleic, and palmitic
acid, with a variable effect of the tested treatments being observed. In conclusion, the application of
biostimulants could be considered as an eco-friendly and sustainable means to increase the pod yield
and the quality of common bean green pods and seeds under normal irrigation conditions. Promising
results were also recorded regarding the alleviation of negative e effects of drought stress, especially
for the application of arbuscular mycorrhizal fungi (AMF; G treatment), which increased the total
yield of green pods. Moreover, the nutritional value and chemical composition of pods and seeds
was positively a effected by biostimulants application, although a product specific e
effect was recorded depending on the irrigation regime and harvesting time (pods and seeds).
Description
Keywords
Arbuscular mycorrhizal fungi Biofertilizers Common bean Glomus spp. Organic acids Pod quality Seaweed extracts Seed quality Tocopherols Total sugars
Pedagogical Context
Citation
Petropoulos, Spyridon A.; Fernandes, Ângela; Plexida, Sofia; Chrysargyris, Antonios; Tzortzakis, Nikos; Barreira, João C.M.; Barros, Lillian; Ferreira, Isabel C.F.R. (2020). Biostimulants application alleviates water stress effects on yield and chemical composition of greenhouse green bean (phaseolus vulgaris l.). Agronomy. ISSN 2073-4395. 10:2, p. 1-26