Association of root morphological characters with resistance to water deficit in some rapeseed genotypes (Brassica napus L.)

Toorchi, M.; Sheikh, F.; Valizadeh, M.; Shakiba, M.R.; Islam, B.P.

Agricultural Science Tabriz 15(3): 15-25

2005


Accession: 012767479

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Abstract
Root depth and spread have an important role in drought resistance and soil moisture use efficiency. This experiment was conducted to study the root characters of rapeseed and their impact on drought resistance. The test genetic material consisted of B. napus cultivars (Global, Puma, Regent, Eureka and PF 7045.91), B. rapa [B. campestris] cultivars (Sonja and Parkland), and two hybrids (Hyola308 and Hyola401). The experiment was carried out under normal and water deficit conditions. Water deficit was imposed by stopping the irrigation at 50% flowering. The results showed significant differences between two conditions as well as between genotypes with respect to most of the characters studied. Among cultivars, Global recorded the highest values for plant height, shoot dry weight and number of silique, followed by Puma and PF 7045.91. These three cultivars had the highest maximum root length, root volume and root thickness. Puma was able to modify its root system under water deficit condition and gained adaptive/inducible characters to compensate drought. Maximum root length was highly and positively correlated with root-to-shoot dry weight ratio and root-to-shoot length ratio under water deficit condition. Canonical correlation analysis showed high correlation between root morphological traits and shoot related characters in normal as well as water deficit conditions.