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:: Volume 11, Issue 1 (4-2009) ::
علوم زراعی 2009, 11(1): 40-54 Back to browse issues page
Evaluation of response of maize (Zea mays L.) inbred lines to heat stress under Khuzestan conditions -using stress tolerance indices
Abstract:   (5114 Views)
Response of maize (Zea mays L.) inbred lines to heat stress was evaluated under Khuzestan conditions-using stress tolerance indices. Fifteen maize inbred lines were evaluated in two separate experiments, in two sowing dates, using randomized complete block design (RCBD) with three replications in Shushtar region in the southern part of Iran in 2007 cropping season. Sowing dates were on 06 July 2007 (simulating heat stress condition) and 27 July (non-stress condition). Tolerance indices including Mean Productivity (MP), Tolerance Index (TOL), Stress Susceptibility Index (SSI), Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP) were calculated. Results showed that theree indices SSI, STI and GMP were more efficient in identifying the heat tolerant inbred lines. However, based on the results and correlation studies performed GMP was the most suitable index for evaluation of response of maize inbred lines to heat stress. Therefore, this index could be used for identifying of inbred lines with high grain yield in either conditions. According to GMP and STI indices inbred lines No. 10 and 8 were the higher yielding and tolerant to heat.stress. Biplot study clearly divided inbred lines into tolerant and non-tolerant groups. Inbred lines No. 10, 8, 4 and 14 with high grain yield potential and low sensitivity to heat stress were identified as suitable inbred lines for hybrid development in the Khuzestan region. Distrubution of inbred lines in biplot also implies genetic variation among the inbred lines for heat tolerance. Cluster analysis, using tolerance indices GMP and STI, showed that inbred lines No. 10 and 8 were the most heat tolerant with highest genetic distance from the other inbred lines. In addition, inbred lines No. 4, 14, 13, 15 and 5 also showed greater level of heat tolerance as compared to the other inbred lines.
Keywords: Cluster analysis, Heat stress, Inbred lines, Maize and Tolerance indices
Full-Text [PDF 581 kb]   (1288 Downloads)    
Type of Study: Scientific & Research | Subject: Special
Received: 2015/02/23 | Accepted: 2015/02/23 | Published: 2015/02/23
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Evaluation of response of maize (Zea mays L.) inbred lines to heat stress under Khuzestan conditions -using stress tolerance indices . علوم زراعی 2009; 11 (1) :40-54
URL: http://agrobreedjournal.ir/article-1-217-en.html


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Volume 11, Issue 1 (4-2009) Back to browse issues page
نشریه علوم زراعی ایران Iranian Journal of Crop Sciences
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