The study was carried out to assess whether water uptake could be improved in sugar beet seeds and salt tolerance at the germination and early seedling stage by soaking the seeds for 10 h in distilled water (control), 100, 150 and 200 mg L(-1) GA3. Electrical Conductivity (EC) values of the NaCl solution were 0.0 (control), 4.7, 9.4 and 14.1 dS n(-1) NaCl. Priming increased the final germination percentage and the germination rate (1/t 50, where t 50 is the time to 50% of germination) under saline condition. Water uptake of primed seeds also increased significantly with increasing concentration of GA3 as compared to control. Priming also alleviated the adverse effect of salt stress on sugar beet in terms of roots and shoots lengths and fresh weights of plants, roots and shoots.
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[Show abstract][Hide abstract] ABSTRACT: The experiments were carried out at the Post Gradu-ate Research Center, to study the influence of Gib-berellic Acid (50 ppm) and Oxygenated Peptone (1% aqueous solution) on chick pea (Cicer arietinum L. cv. Vijay) during germination by giving pre-sowing soaking treatment for 6 hours using petriplate method. Both the treatments enhanced the germination proc-ess. GA treatment was useful to increase shoot length, mobilization efficiency, emergence index, speed of germination and co-efficient of germination while oxygenated peptone showed an upper hand in root length, shoot/root ratio, biomass and vigour index. GA led to comparatively more synthesis of nucleic acids while oxygenated peptone showed more in-crease in total carbohydrates and soluble protein content. However, the activity of enzymes like amy-lase, catalase and protease showed upper hand with oxygenated peptone as compared to GA. In fact GA is costlier and can not be used in organic farming as it enters metabolic pathways of plant and alters them. Hence the use of oxygenated peptone is recom-mended being less expensive and usable under or-ganic farming condition as it does not enter the plant metabolic pathways and yet brings about significant positive effect.
Advances in Bioscience and Biotechnology 01/2011; 2(01). DOI:10.4236/abb.2011.21007
[Show abstract][Hide abstract] ABSTRACT: Plants are frequently exposed to a plethora of unfavorable or even adverse environmental conditions, termed as abiotic stresses (such as salinity, drought, heat, cold, flooding, heavy metals, ozone, UV radiation, etc.) and thus they pose serious threats to the sustainability of crop yield. Soil salinity, one of the most severe abiotic stresses, limits the production of about 6 % of the world’s total land and 20 % of irrigated land (17 % of total cultivated areas) and negatively affects crop production worldwide. On the other hand, increased salinity of agricultural land is expected to have destructive global effects, resulting in up to 50 % land loss by the next couple of decades. The adverse effects of salinity have been ascribed mainly to an increase in sodium (Na+) and chloride (Cl–) ions and hence these ions produce the critical conditions for plant survival by intercepting different plant mechanisms. Both Na+ and Cl– produce many physiological disorders in plants but Cl– is the most dangerous. A plant’s response to salt stress depends on the genotype, developmental stage, as well as the intensity and duration of the stress. Increased salinity has diverse effects on the physiology of plants grown in saline conditions and in response to major factors like osmotic stress, ion-specificity, nutritional and hormonal imbalance, and oxidative damage. In addition to upper plant parts, salinity also affects root growth and physiology and their function in nutrient uptake. The outcome of these effects may cause the disorganization of cellular membranes, inhibit photosynthesis, generate toxic metabolites and decline nutrient absorption, ultimately leading to plant death. In recent decades, exogenous protectants such as osmoprotectants, phytohormones, signaling molecules, polyamines, antioxidants and various trace elements have been found effective in plants in mitigating the salt induced damages. These protectants showed the capacity to enhance the plants’ growth, yield as well as stress tolerance under salinity. In this chapter we attempt to summarize differential responses of plants to salinity with special reference to growth, physiology and yield. Further, we have discussed the progress made in using exogenous protectants to mitigate salt-induced damages in plants.
Ecophysiology and Responses of Plants under Salt Stress, 01/2013: pages 25-87; , ISBN: 978-1-4614-4746-7
[Show abstract][Hide abstract] ABSTRACT: Experiments were performed to examine the effect of salt stress and GA3-priming on initial
growth of two rapeseed cultivars, one tolerant and one sensitive to salt stress during germination. Seedlings
from seeds germinated in salty (as NaCl) and non salty substrate were grown in salty and non salty
hydroponics. Salt stress reduced seedling growth of the two genotypes consistently with their degree of
stress tolerance during germination. Seedlings from stress sensitive seeds germinated under high salinity
showed a rapid recover of growth in non stressing conditions. The effect of salt stress on shoot/root ratio
was controversial, increased for lab and decreased for greenhouse experiments, probably due to different
timing of stress application and additional experimental conditions. Salt stress decreased leaf photosynthesis
and increased thermal dissipation in sensitive seedlings (decrease of ΦPSII and qP, increase of NPQ). The
GA3-priming did not affect seedling growth of the stress sensitive cultivar subjected to stress, while it
greatly improved the performance of the stress tolerant cultivar.
Acta Scientiarum Agronomy 10/2013; 35(4):479-486. DOI:10.4025/actasciagron.v35i4.17655 · 0.83 Impact Factor