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Investigation of yield and yield components of sunflower (Helianthus annus L.) cultivars to determine susceptible and tolerant lines in drought tension conditions
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Babak Maghsoudi Damavandi   , Shahram Lak * , Mehdi Ghaffari , Mojtaba Alavifazel , Tayeb Sakinezhad |
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Abstract: (1878 Views) |
| In order to determine the susceptible and tolerant lines of sunflower to drought tension, an experiment as a randomized complete blocks design with three replications was conducted at Karaj Seeds Oil Research Institute. In this investigation, 12 different sunflower liens have been screened for the characteristics related to drought tolerance and two susceptible and tolerant lines wereidentified. So, initially, sunflower lines were cultivated in two separate experiments under normal irrigation and drought tension conditions in a randomized complete blocks design with three replications. Drought tension was carried out through irrigation cut in step 2 to 8 leaves. The investigated traits included yield characteristics and yield components of sunflower, such as one-thousand grain weight, number of seeds per head, oil percentage, grain yield and oil yield.The traits were significantly different except for oil percentage at a probability level of 1 percent. After investigating the studied factors and analyzing the data, the obtained results were determined by examining the percentage change in the studied traits, calculating the tension indices (drought tolerance, drought susceptibility indices) and drawing a dendrogram derived from cluster analysis of cultivars. In conditions of application of tension, RGK46 and RGK41 had the highest and lowest one-thous and weight, respectively, among the existing lines. Also, about the number of seeds per head, RGK26 and RGK44 had the highest and lowest number of seeds per head, respectively. In terms of grain yield RGK26 and RGK41 had the highest and lowest grain yield per plant, as well. Combining these factors and comparing the traits among cultivars, we can identify BGK221 line as the sensitive line and the RGK46 line as tolerant from the 12 lines studied. Also, the number of seeds per head with the weight of one-thousand grain weight and oil yield is positively correlated. Also, grain yield was positively correlated with STI index. |
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| Keywords: Sunflower line, Tension index, Correlation and Cluster analysis. |
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Full-Text [PDF 1317 kb]
(2052 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2020/06/1 | Accepted: 2020/06/1 | Published: 2020/06/1
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