Pre-sowing Seed Treatment with Proline Improves some Growth, Biochemical aspects, yield quantity and quantity of two sunflower cultivars grown under seawater salinity stress
Journal Title: Scientia Agriculturae - Year 2015, Vol 9, Issue 1
Abstract
The depletion of freshwater resources leads to the utilisation of various alternative sources ofwater, such as seawater. In this regard, the presowing treatment of proline is one of the alternative shotgun approaches to increase plant stress tolerance. A pot experiment was conducted at wire house of the National Research Centre, Dokki, Cairo, Egypt to elucidate the effect of pre-sowing seed treatment with proline (0, 2.5, 5 and 7.5 mM as P0, P1, P2 and P3, respectively) on growth, some biochemical attributes of two cultivars of sunflower plant (Helianthus annuus L.) plants under seawater stress (0.23, 3.13, 6.25 dS/m as tap water S0, S1 and S2, respectively). Plant samples were collected after 45 days from sowing. Results showed that increasing sea water concentration induced reduction in all growth parameters (plant height, number of leaves shoot fresh and dry weights/plant), photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoids), yield parameters (head diameter, seed weight/head and 100- seed weight), oil% and protein % of the yielded seeds of the two cultivars of sunflower plant compared with those of the untreated unstressed plants (S0). In contrast, increasing sea water stress led to increases in total phenolics, total soluble carbohydrate, free amino acids and proline contents. Special attention was paid to the effect of proline treatments on the salt stressed sunflower that stimulates plant salt tolerance via improving growth parameters, photosynthetic pigments, total soluble carbohydrate, free amino acids, proline contents. Meanwhile phenolic content decreased relative to their corresponding salinity controls. From these results, pre-sowing sunflower seed treatment with proline seem to enhance sunflower salt tolerance by amelioration of photosynthetic pigments, osmoprotectants of vegetative organs, hence improved plant growth and the preservation of a suitable plant water status under salinity conditions.
Authors and Affiliations
Mervat Sh Sadak
Keywords
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- EP ID EP158252
- DOI 10.15192/PSCP.SA.2015.1.9.6069
- Views 122
- Downloads 0
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