The studying effect of drought stress on germination, proline, sugar, lipid, protein and chlorophyll content in purslane (Portulaca oleracea L.) leaves

Abstract

Purslane (Portulaca oleracea L.) is one of the valuable medical plants. Drought also is one of the most important environment stresses that influences metabolism and growth of plant. The studying of physiological plant response rather than water stress can be influential equipment for understanding drought resistance mechanisms. In this study, the drought stress effects on germination and physiological characteristic of the medical plant (purslane) were studied. Drought imposed on polyethylene glycol (PEG) seedlings and experiments were done in completely random model framework, with 3 replications. Polyethylene glycol stress was in seven levels involving blank (distilled water),-0.1,-0.2,-0.4,-0.6,-0.8 and-1 MPa. In relation to germination, meaningful difference was not observed between blank and the different levels (P<0.01); and the least rate of germination in stress level was-0.4 MPa) and the highest rate of germination in stress level was-0.2 MPa). Meaningful increase of proline and sugar synchronized with PEG concentration was observed in statistical level (P<0.01) with meaningful difference. In this, blank had the least rates and stress level of-1 MPa and the highest proline and sugar rates. Lipid content in purslane leaves with increasing stress level was decreased. In the highest lipid rate in stress level (-0.2 MPa) and the least concentration in stress level (-1 MPa), it was observed that this difference in P<0.01 was meaningful. The concentration of leave proteins with meaningful decrease (P<0.01) had the highest protein concentrations in blank and the least concentration in stress level was-1 MPa. In stress effect on leaf chlorophyll content, meaningful increase of chlorophyll a and b synchronized imposed increase of stress level. It was observed that with chlorophyll a the highest concentration in stress level was-0.6 MPa and the least concentration exists in blank; and also with chlorophyll b the stress level,-1 MPa had the highest and blank had the least concentration (P<0.01).

The Effect of Selenium Foliar Application on the Physiological Responses of Edamame under Different Water Treatments

“…Drought stress may also reduce leaf chlorophyll content, which is a critical factor in reducing plant growth and yield [26]. In the current study, selenium treatment (75 mg/L) at the vegetative stage alleviated the negative effects of drought stress by increasing chlorophyll accumulation, further suggesting the upregulation of photosynthesis.…”

Evaluation of the Physiological Response of Ornamental Summer Season Annuals to Salinity Stress

“…Thus, P. grandiflora and B. scoparia had highest salt tolerance index as compared to other two species. The results of current investigation agreed with Chen et al [24] and Rahdari et al [25] where they observed that Proline accumulated significantly with consequent increase in level of salinity. Don et al [26] evaluated that the proline content increased in gerbera with increased salinity levels and this proline depict the adaptive response of gerbera to short term salinity.…”

Changes in Photosystem II Complex and Physiological Activities in Pea and Maize Plants in Response to Salt Stress

“…A similar reduction in the Chl amount was registered in chickpea, Solanum lycopersicum, Triticum aestivum, Ricinus communi, and other plant species [3,[45][46][47][48]. A salt-induced reduction in the chlorophyll content could be attributed to impaired chlorophyll biosynthesis and/or increased chlorophyll degradation, although the impact of these processes varies in plant species [49]. The decrease in Chl content in pea corresponds with an increase of the Chl a/b ratio (Table 1), suggesting a reduction of the LHCII and a decrease of the number of granal thylakoids [50][51][52], i.e., having an influence on the organization of the thylakoid membranes.…”