Effects of Salinity Stress on the Morphology and Yield of Two Cultivars of Canola (Brassica napus L.)

Research Article

**Effects of Salinity Stress on the Morphology and Yield of Two Cultivars of Canola (Brassica napus L.)**

Homa Mahmood Zadeh and Ma'ssoumeh Bemani Naeini

The present research has studied the effects of NaCl of different concentrations on some characteristics of canola. Two cultivars of canola, Okapi (tolerant cv.) and Symbol (sensitive cv.) have been studied under five salinity treatments, including 0, 3, 6, 9 and 12 ds m^-1, in both the laboratory and green house conditions. In the laboratory, seed germination rate and percentage and seedling growth were assayed. In the green house condition, the growth parameters were measured in vegetative, generative and harvesting phases. Results showed that the percentage and rate of seed germination, seedling growth and distance between the root hairs and root tips were all decreased by salt solutions, especially by 12 ds m^-1 treatment. However, these parameters were increased by 3 ds m^-1 treatment. Also, being treated with salt solutions, within the range of 12-20 ds m^-1, the threshold concentration for germination was determined as 14 ds m^-1 for Okapi and 13 ds m^-1 for Symbol. Results showed that the effects of salinity stress on the phase of germination is less than the other phases. Under greenhouse condition, the vegetative growth and yield of both cultivars were unaffected by soil salinity of a rate of up to 3 ds m^-1. By increasing the salinity levels above the threshold, the ratio of fresh to dry biomass, thickness of leaves, plastochronic period, thickness of pollen exine and 1000-siliqua weight increase. On the other hand, number of leaves, branches, flowers, flower primordia, siliquas and their length, number of seeds per siliqua and 1000-seed weight all decreased. The most inhibitory effect was observed in 12 ds m^-1 treatment with more effect on Symbol than on Okapi. The length of siliquas, plastochronic period and number of flowers were more affected by salinity stress than the other parameters.

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Homa Mahmood Zadeh and Ma'ssoumeh Bemani Naeini, 2007. Effects of Salinity Stress on the Morphology and Yield of Two Cultivars of Canola (Brassica napus L.). Journal of Agronomy, 6: 409-414.

DOI: 10.3923/ja.2007.409.414

URL: https://scialert.net/abstract/?doi=ja.2007.409.414

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Homa Mahmood Zadeh

Ma'ssoumeh Bemani Naeini

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Research Article

**Effects of Salinity Stress on the Morphology and Yield of Two Cultivars of Canola (Brassica napus L.)**

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