Evaluation of Drought Tolerance in Rapeseed Genotypes under Non Stress and Drought Stress Conditions

Abstract

Drought is a wide spread problem seriously influencing rapeseed (Brassica napus L.) production, mostly in dryland regions. This study was conducted to determine drought tolerance genotypes with superiority in different stressed environments. Twenty three rapeseed genotypes were tested in a split plot design based on randomized complete block design (RCBD) with four replications in two years (2008- 2009 and 2009-2010) at Seed and Plant Improvement Institute of Karaj, Iran. Seven drought resistance indices include susceptible stress index (SSI), tolerance index (TOL), stress mean productivity (MP), geometric mean productivity (GMP), stress tolerance index (STI), yield index (YI) and yield stability index (YSI) were applied on the basis of seed yield in non stress and drought stress conditions. Based on different drought indices, genotypes ‘Modena’, ‘Geronimo’, ‘Elite’, ‘Syn-4’ and ‘SLM046’ had the best rank with low standard deviation. The results indicated that they have stable yield performance. Bi-plot display and cluster analysis cleared superiority of these genotypes in both years. The synthetic derived cultivars could perform well across all environments with better agronomic performance. Results showed MP, GMP and YI indices were more effective in identifying high yielding cultivars in diverse water scarcity.

Evaluation and comparison of drought tolerance in some wild diploid populations, tetraploid and hexaploid cultivars of wheat using stress tolerance indices

“…This is also approved by cluster analysis. Other researchers, using cluster analysis based on stress tolerance indices and genotypic classification, indicated that the results obtained from this method are consistent with the principal components analysis (Ahmadizadeh et al, 2012;Mohammadi et al, 2011;Rad and Abbasian, 2011). The clusteranalysis of 30 genotypes of wheat were placed into three separate groups (Parchin et al, 2013).…”

Screening Drought Tolerant Rapeseed Cultivars Using Yield and Physiological Indices

“…Development of cultivars with improved drought tolerance is of great importance in rapeseed breeding programs. Rapeseed cultivars have shown significant variation in terms of drought tolerance [2,3] and [4]. Responses to drought stress depend on genotype, intensity and duration of water deficit, weather conditions, growth and developmental stages of rapeseed [5].…”

“…Furthermore, yield index (YI) was defined as ratio of the yield of a given genotype under stressful conditions to the average yield of all genotypes in the same conditions [13] and [14]. Previous studies demonstrated that STI, MP, GMP and MSTI are appropriate indices for screening drought tolerant rapeseed genotypes [2,3,4] and [15]. Water use efficiency (WUE) for yield is another major component to take into account for plant production under water-limited conditions, although the relationship between WUE and drought tolerance is complex and variable [16].…”

Response of Canola Advanced Lines to Delay Plantings upon Late Season Drought Stress

“…Canola is relatively poorly adapted to drought prone conditions (Wright et al, 1997) and its yield is often decreased if moisture stress occurred, particularly at reproductive stage (Ahmadi and Bahrani, 2009;Shirani Rad and Abbasian, 2011). The reduction in seed yield ranged from 19 -39% compared with well-watered control, when drought stress was imposed at reproductive stage (Gunasekara et al, 2006).…”